prc catalog issue no 42 (ppre-flight)many other resistor types on the market require at least2or...

PRC CATALOG ISSUE NO 42 (Pre-Flight CMYK).pdf 1 11/9/2009 8:10:47 AM

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PRC’s product catalog contains all detailed information including complete electrical & mechanical description of our special-purpose resistance devices and demonstrates how these unique concepts for

precision wire wounds will benefit you in today’s hi-tech world as a design engineer

What Precision Means To You:

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PRECISION RESISTOR’S MISSION STATEMENT

To continue a tradition ... with competitively priced, high quality, 100% USA producedcustom precision fixed wire wound resistors, sensors and shunts for critical applications

and to serve the needs of our customers who utilize these products.

BETTER FLEXIBILITY FORCUSTOM ENGINEERINGPRC's precision wire wounds areideal for short run developmentprojects as well as long productionruns that are needed in a hurry.Set-ups and tooling are easier toassemble than other resistor typesand specs can be quickly transferredfrom the model shop and laboratoryto the production floor.

BUY ONLY WHAT YOU NEED

LARGE SELECTION

Why buy 50 pieces or more, if all youneed are a few resistors for tests or adozen parts to complete yourrequirement? Small quantity lots orhigh volume production quantities areaccurately checked 100% to assurespecified limits and delivered

to meet critical schedules.

You can specify any resistancevalue or decimal part of an ohmfrom 0.001 to 10Megwith tolerances to ±0.005% andTCR's to 0±1 ppm/°C. Also, shownare temperature-sensitive resistorsand compensators to +6000 ppm/°C.as well as a complete line of four-terminal thru-hole and SMD precisionsub-miniature current shunts.

on time

Widest range of values anywhere!

Ω Ω

LOW VALUE/LOW TCRCOMBINATIONS

HIGH SURGE CURRENTHANDLING CAPABILITIES

COMMERCIALLY PURECOPPER TERMINALS

PRC's extremely low values to1 milliohm and TCR ±15 ppm/°C.provide better load-stability. Thismeans the quality to resist perma-nent change is designed into theparts from the start for dependableand repeatable measurementspiece-to-piece.

Many other resistor types on themarket require at least 2 or moreparts to equal the power andoverload capabilities of 1 PRCresistor. That's why the 3 and 5watt precision shunt valuesare so popular.

Why copper? Because of itsexcellent current carrying capacity.No material is better suited forprecision parts than commerciallypure copper. That is, oxygen-free,high conductivity, low resistivity,hot-tinned copper terminals. Hot-tinned rather than electro-tin platedterminals because they offerbetter wetting characteristicsand longer shelf life. Beware ofcopper clad or other materials that

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have a strong magnetic attractionand exhibit a high EMF especiallywhen specifying low value preci-sion resistors. Another reasonengineers want commerciallypure copper is because of its lowresistivity.

All PRC resistors (especiallylow values) have low EMF (<0.3to 1.5 microvolts per deg. C.) withrespect to the copper terminals.Many low value tin oxide and othergeneral-purpose power resistors inthe industry have thermocoupleerrors as large as 100 microvoltsper deg. C., which degrade circuitperformance. Try to avoid thermalgradients that could cause a largetemperature difference across theresistor and specify resistors withlow EMF construction.

PRC's precision/power resistorsare the choice of engineers anddesigners because of their reason-able costs and time-proven heavy-duty service. Reliability anddependable quality year-after-yearare “the real value” of precisionwire wound resistors.

LOW THERMAL EMF VS. COPPER

TIME-PROVEN SERVICE

If you are looking for stable quality components specifically designed for repetitive & predictable applications then review this easy-to-specify brochure and select exactly what you need. Let our

70+ years of invaluable experience in resistor design and manufacturing work for you. We are very confident that you too can “profit from Precision.”

PRECISION RESISTOR CO., INC.10601 75TH Street North, Largo, Florida 33777-1421 U.S.A.Tel: 727-541-5771 Fax: 727-546-9515Email: [email protected] Site: http://www.precisionresistor.com

ISSUE NO. 42

Page Number & Brief Description

Engineers & Designers: What Precision means to you

Purchasing Information: Match resistors to your specs

PRC Facts: When you need the ultimate in Precision

Type HR/HVA/HVS: thru-hole and SMDUltra Precision

Type LVS: PRC’s for SMT current-sensing“crown jewel”

Type PLV Shunts: Combine “power with precision”

More PRC Facts: Temperature-sensitive resistors

Type PT/ST Compensators: Offset for A/D conversions

PRC100 (Chart): but is more versatile“Tracks like platinum”

PRC100 Sensors: Request a few samples and compare

Type SX-Silicone Coated : Widest range of precision values anywhere

Type SM High-Value: Sub-miniature precision power resistors

Type SM-4: Unique low ohmic value 4-wire power designs

Type MS: DC MV Meter Shunt &International Sales Representatives

Please specify (where they apply) ...

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8.

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14.

15.16.

QuantityResistance valueResistance toleranceCurrent/Special lead sizeTCR Char./Stability specsPRC type or wattage ratingTemperature span of operation

Special TestingCustom marking

Qualification standards

Bulk or tape and reel packaging

Delivery requirements

Overload requirementsCertification requirements

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MC-7: Digital Multimeter Calibrator


ISSUE NO. 42

:stcafesehtredisnocdeenuoynehW “the in Precision”ultimate

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TOLERANCE, TCR & AMBIENTTEMPERATURE as One SpecThe TCR and temperature are also vitalfactors when specifying very accurateresistors and must be part of theequation.

is expressedas (±) plus or minus percent of thenominal value (ohms) required. (AllPRC resistors are calibrated and testedwithin specified limits at 25°C unlessotherwise noted.)

- We know there is no TCR(Temperature Coefficient of Resistance)without a change in temperature. Thatis, no proportional change in resistancewithout a change in the ambient orsome self-generated temperature shiftresulting from an excitation of power.This variation in resistance with respectto the change in temperature isexpressed in parts per million (ppm),Percent (%) or in ohms/ohm … per °C

The TCR for0±5ppm, also expressed as±0.000005 or ±0.0005%per degree C. as with all TCRsat PRC, is calculated between+25°C. and +100°C using theindustry standard formula onpage 9 … unless otherwisenoted. Therefore, a 10005ppm resistor is multiplied by0.000005 or 0.005change/°C

- is the measure of heator cold of an object or substance anddirectly related to the TCR andtolerance. Since the TCR char. is thevariation in resistance above or belowroom ambient (23°C or 25°C) or a spanthat includes both, it is essential withclose resistance tolerances and lowTCR requirements, to specify thetemperature span of operation and treatall the surrounding conditions affectingthe resistor as “one-spec.”

Resistance Tolerance

TCR

Temperature

For Example:

Ω

Ω

Ω Ω

WHY’S STABILITY SO IMPORTANT?

EXTRA POWER … When You Need It!

LVS SHUNT is PRC's “crown jewel” forSURFACE MOUNT CURRENT SENSING

Stability is the quality to resistpermanent change, and must bedesigned into the parts from the start. Itis very difficult to stabilize or condition ageneral-purpose resistor and beconfident that it will meet a criticalapplication. All stability specs at PRCare designed for precise requirementseven if you specify ±1% resistancetolerances.

PRC's precision power resistors arenoted for the surge current handlingand overload capabilities. However, allcatalog ratings are based uponstandard ±1% resistance tolerances at+25°C or +125°C depending upon theresistor type. Derating is required forhigher temperatures and closertolerances. Please refer to the deratingcurves for each type resistor. Usually alarger part or a lower TCR will help, butheat is heat and must be carried off insome manner.

The LVS on page 6 as well as thePLV 4-lead version on page 7 areideal in voltage drop applications andfor accurate current-sensingrequirements … because of theirstability and flexibility. These uniqueparts not only offer lower values withcloser tolerances, but also lower TCR's(10ppm) … over a wider temperaturespan. The low TCR feature providesbetter thermal stability for moredependable measurements under loadconditions. In addition, PRC's shuntvalues provide low EMF with respect tothe tinned copper terminals. Thermaleffects, EMF and dissimilar metalsbecome part of the resistance readingsof low values. Specify low EMF and tryto avoid thermal gradients that couldcause a large temperature differenceacross a critical part. Obviously, themore information we have, the betterwe are able to match parts to yourspecifications.

PRC INTERESTING FACT

PRC OFFERS THESE FEATURES:

YOU CAN CUSTOM DESIGN YOUROWN LOW VALUE PRECISION SHUNT

One of the shunt values we tested wasa ten milliohm, 10-watt part (PLV10AL0.0 ±1%) that developed over 30amperes under full load. Because ofits aluminum oxide rectangular caseand special low TCR element, theresistance change (under load) wasless than ±0.1% … and there wasvirtually no measurable EMF.Now that is a breakthrough!

We certainly were impressed with theresults ... and we are confident we canhelp you in a similar manner.

1. Wide variety of shapes & sizes2. Measurable and predictable

voltage/temperature relationshippiece-to-piece.

3. Low value/close tolerancecombinations.

4. Low TCRs5. High temperature insulation.6. Single-joint 4-terminal construction

to eliminate lead-out and contactresistance.

7. Assorted diameters of pure copperleads for high current-carryingcapacities and lower resistance percircular mil foot.

That's right, you can design, test andfine-tune engineering samples so theyperform like a precision instrument. Trya few of our shunts today, becausemany of the popular values are in-stockfor immediate delivery. Better yet,if we don't have exactly what you needin stock, special engineering sampleswill be manufactured to your specsquickly … and at no cost!

1Ω

(CONTINUED ON PAGES 5-7)

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ISSUE NO. 42

TYPE SPTYPE PT

TYPE STTYPEATL

W

C

Type HR

Type HVS

AA

H

H

Wc

ab

L

Type RX

Type HVA

BB

For RES. TOL. ± 0.5%

For RES. TOL. ± 0.02 %

For RES. TOL. ± 1%

For RES. TOL. ± 0.25%, ± 0.1 %

For RES. TOL. ± 0.01 %, ± 0.00 5 %


100

75

50

3525

10

0

TN

EC

RE

PR

EW

OP

DE

TA

RF

O)

TU

PNI-S

TT

AW(

127 132125 130 135 140 145

CHARACTERISTICC

COMBINED TEMPERATURE OF SELF-HEATING AND AMBIENT (IN °C.)

FIG. #1DERATING

CURVE

ELECTRICAL & PHYSICAL SPECIFICATIONS

ValuesTolerancesTCR CharGreater StabilityTemperature

...................................... from 0.1 thru 10 Megohms.............................. ±0.01% (Std.) … to ±0.005%............................. 5ppm (Std.) … to 0±1ppm/°C

........................................ to ±0.001%/year............................................... -65°C to +145°C

Ω

ENGINEERING DATA:RESISTANCE AND TOLERANCES

TCR CHARACTERISTIC

POWER VS. AMBIENT TEMP.

STABILITY

You can select any ohmic value ordecimal part of an ohm with tolerancesto ±0.005% 10 min. required for ±0.01% tol.

0±5ppm/°C (100 and above);0±15ppm/°C. (values below 100 ) -calculated between +25°C. and +100°C.

to 0±1 ppm°C. - matching to 0±0.5 ppm°C.

All Ultra resistors are designed for full loadbased upon ±1% res. tol. - providing theambient temp. - plus the temp. rise due toself-heating does not exceed +125°C.Derated to zero power at +145°C. see Fig. 1.

To ±0.001% / yr. at 25°C. (no load).

Ω

ΩΩ

Standard:

Special:(Please specify temperature span of operation.)

THERMAL EMFVS. COPPER TERMINALS

INDUCTANCE

< ±3 microvolts per degree C.

Non-inductive balanced reverse pi windings arestandard on HR and RX. Special on HVS & HVA.

PROTECTIVE SEAL

MARKING (Identication)

Stress free base coat and epoxy case.Solder heat and solvent resistant.

PRC symbol, type, value and tolerance.

RX255NRX258N

HR103HR175NHR186NHR188NHR256NHR258NHR2512NHR3114NHR3712NHR3716NHR5016NHR5024NHR5032N

RBR71 RB71

RB56RB55RB54

RB53RB52RB57RB58RB59

RBR74RBR56RBR55RBR54RBR76RBR53RBR52RBR57

PRINTED CIRCUIT

AXIAL LEAD

LEAD MOUNTED & SURFACE MOUNTED

.25W

.33W

.1W

.2W

.2W

.25W

.25W

.33W

.5W

.5W

.66W1W1.5W2W2.5W

100V300V

50V100V150V150V200V300V300V300V300V600V600V900V

1200V

7.9212.7

5.087.929.53

12.79.53

12.719.0520.6219.0525.425.438.150.8

0

0

0

0000

(.312”)(.500”)

(.200”)(.312”)(.375”)(.500”)(.375”)(.500”)(.750”)(.812”)(.750”)

(1.000”)(1.000”)(1.500”)(2.000”)

(.250”)(.250”)

(.100”)(.156”)(.187”)(.193”)(.250”)(.250”)(.250”)(.312”)(.375”)(.375”)(.500”)(.500”)(.500”)

6.356.35

2.543.964.754.96.356.356.357.929.539.53

12.712.712.7

0

0

0

.200”

.200”.025”.025”

.020”

.020”

.025”

.025”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

1”1”

1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”1.5”

0.10.1

1.00.10.10.10.10.10.10.10.10.10.10.10.1

100K250K

10K80K100K125K127K226K511K600K750K1.523.015.11

MEGMEG

MEGMEG

150K350K

20K100K150K200K350K500K1

1.52357.510

MEGMEGMEGMEGMEGMEGMEG

Max.Volts

Max.Watts

H

ins.mm

L

ins.mm

W

ins.mm

a b c d

PRCType

Meets or ExceedsEnvironmentalConditions of:

MIL-R-39005 MIL-R-93

Max.Watts

1%Res.Tol.

(A) Length (B) Diametermm

±1.57mm

±.787(ins)

±.062”(ins)

±.031”

StandardSpace

C

(ETP/OFHC)Tinned Copper Leads

* Resistance ( )Ω

Resistance ( )Ω

Diam.Max.

Length(±.125”)

t Min.

Max.Volts Max.

Standard

Min.

Max.Special

Max.

LeadDia.

1”L Min.

PRC TYPE

AXIAL

HVA1

HVA2

HVA3

HVS1

HVS2

HVS3

SMD

0.2W

0.25W

0.5W

100V

150V

250V

.075”

.125”

.100”

.075”

.112”

.112”

.100”

.100”

.100”

.260”

.310”

.425”

.020”

.025”

.031”

0.1

0.1

0.1

75K

150K

500K

3.30

6.35

6.35

.130”

.250”

.250”

9.14

9.78

12.7

.360”

.385”

.500”

3.18

5.72

6.35

.125”

.225”

.250”

*Commercially pure copper (electrolytic tough pitch/oxygen-free high conductivityPAD LAYOUT d

t = 2” Leads on MIL-Styles

5

RX378N RB70 .5W 200V 12.70 (.500”) (.375”)9.53 .200” .032” 1” 0.1 301K 500K

How Can the Ultra-Precision Series Help You?

HVA5 HVS5 1.0W 600V 7.87.310”

7.87.310”

15.88.625” 0.1 1MEG.031”.075” .112” .100” .551”


ISSUE NO. 42

±.015” ±.015” ±.015” ±.015”

PV S1

PV S2

LV S3

PV S3

LV S5

PV S5

PAD LAYOUT

d

e

ENGINEERING DATA:

RESISTANCE AND TOLERANCES

TCR CHARACTERISTICS

STABILITY VS. TIME

PRECISION POWER

You can select any ohmic va

±15 ppm/°C.(std.) Please specifytemperature span of operation.Add LTC in the part # forTCR 0±10ppm/°C. to +150°C.

to ±0.001%/yr. at 25°C. (no load)

Standard Min. Res. @ Max. Wattsbased upon ±1% resistance tolerancesat 25°C. (please see end column above).Derating is required for higher temperatures,closer tolerances and lower resistance valuesplease see Fig. # 3 at top of page.

lue ordecimal part of an ohm from 0.001to 100K with microhm/microvoltaccuracies to ±0.005% see Fig. 2 above.

0

ΩΩ

1.

2.

3.

4.

For types:PVS1 & ST35HVS1, PRC100T,

PTS1,

For types: LVS5, PVS5 & HVS5

4 mm

24 mm (.945”W)

32 mm (1.260”W)

24 mm Tape

32 mm Tape

For types: LVS2,PVS2, &

HVS2, HVS3, LVS3,PTS2, PTS3, PVS3

12.750” O.D.

4” I.D.

1” Wide

See Note

Optional Form1/2” Dia. Hole

Note: Skin packed to tape with polyfilm

PROTECTIVE SEAL

TERMINALS

SMT “Carrier Tape” PACKAGINGper IEC 286-3 (EIA 481):

Rectangular solvent-resistant epoxy caseoffers excellent thermal transfer to base.

Solderable “hot-tinned” pure copper(ETP/OFHC) tab terminals and lowEMF construction reduces thermal effectsusually associated with low value resistors.

Please see Purchasing Information on pg 3.

5.

6.

7.

H o w LV S / P V S S h u n t s W i l l B e n e t Yo u :.................................... to 15 amperes

....................... to ±0.005%......................................... from 1 miliohm to 100K

.............................. 15ppm (Std.) to 0±10ppm/°C.......................... -65 to +250°C (@ 1%)

Precautionary Statement applies to all SMDs /SMTs

*Not to be exposed to temps above 150°C for ±0.1% Tol. And 125°C for tolerances closer than ±0.1% without prior heat testing qualification approval procedures.Re-flow solder methods not recommended closer than ±0.25%

SMD current-sensingOhmic/voltage drop tolerancesValuesTCR Char.Temperature SpanFor closer tolerances, see Fig. # 3 De-rating Curve

Ω


W

W

H

H

a

a

L

Lb b

b b

b

c c

ccType LVS

Type PVS

H

ins.mm

L

ins.mm

W

ins.mm

a

ins.mm

b

ins.mm

c

ins.mm

d

ins.mm

e

ins.mm

PRCTYPE

Max.

AmpWatt

DIMENSIONS ± .787 MM (.031”)Max.Res.( )Ω

Std. Min. Res.@ Max. Watts

Special Min. Res.@ Derated Watts

PVS1

LVS2

PVS2

LVS3

PVS3

LVS5

PVS5

1W3A

2W8A

3W15A

5W15A

3.30.130”

9.14.360”

3.18.125”

3.18.125”

6.35.250”

9.78.385”

5.72.225”

6.35.250”

12.7.500”

4.90.193”

3.81.150”

6.99.275”

4.70.185”

8.08.318”

6.10.240”

6.35.250”

2.54.100”

2.54.100”

2.54.100”

2.54.100”

6.60.260”

7.87.310”

10.8.425”

14.0.551”

7.87.310”

15.88.625”

7.87.310”

1.91.075”

1.91.075”

1.91.075”

2.84.112”

2.84.112”

2.84.112”

2.54.100”

5K

100

15K

100

100

100K

50K

.111ΩΩ @ .009 W

@ 1W.001

LV S2

8 Pitch

12 Pitch

24 mm Tape

24 mm (.945”W) 12 Pitch

4 mm

24 mm Tape

.03 @ 2WΩ

.001 @ 0.064WΩ

.013 @ 3WΩ

.001 @ 0.225WΩ

.022 @ 5WΩ

.001 @ 0.22WΩ

6


ISSUE NO. 42

10% FOR ±0.005%

30% FOR ±0.02%

20% FOR ±0.01%

60% FOR ±0.25%

40% FOR ±0.05%

100

80

60

40

20

25 75 125 250225175

FULL RATED POWER & CURRENT FOR ± 1% RES. TOL.BOTH MAX POWER & MAX CURRENT PUBLISHED MUST BE DE-RATED FOR TOLERANCES CLOSER THAN ± 1%

COMBINED TEMPERATURE OF SELF-HEATING AND AMBIENT (°C.)

TN

EC

REP

OF RE

WOP

DE

TA

R

80% FOR ±0.5%

50% FOR ±0.1%

Fig. #3Derating Curve

PRC’s unique “single joint” design on the 4-tab LVS Series makes tab I.D. academic so you may select the pair closest to the top as yoursense leads & the bottom pair for the current leads or vice versa

100

.005

.01

.02

.05

.1

101

0.1.05.02.01.001 .005

.25

.5

TN

EC

RE

PE

CN

AR

EL

OT

RESISTANCE (Ω)

Fig. 2

MINIMUMRESISTANCEvs. TOLERANCE

REVISED 11-2-12. SUPERSEDES ANY AND ALL PREVIOUS PUBLISHED ARTICLES

10% FOR ±0.005%

30% FOR ±0.02%

20% FOR ±0.01%

60% FOR ±0.25%

40% FOR ±0.05%

100

80

60

40

20

25 75 125 275225175


COMBINED TEMPERATURE OF SELF-HEATING AND AMBIENT (°C.)

TN

EC

REP

OF RE

WOP

DE

TA

R

80% FOR ±0.5%

50% FOR ±0.1%

PLV 3

PLV 5

PLV 7

PLV 2

1W5A

3W15A

5W15A

45A

4.95.195”

5.97.235”

6.35.250”

6.35.250”

7.87.310”

9.53.375”

9.78.385”

12.7.500”

15.88.625”

3.18.125”

4.32.170”

5.72.225”

.028”#21

AWG

.028”#21

AWG

.028”#21

AWG

.032”#20

AWG

.032”#20

AWG

.040” #18

AWG

6.35.250”

7.87.310”

.001 @ 0.009W.055 @ 0.5WΩ

Ω

.04 @ 1W

.001 @ 0.025W

Ω

Ω

.001 @ 0.64W

.03 @ 2WΩ

Ω

.013 @ 3W

.001 @ .225W

Ω

Ω

.025 @ 10W

.001 @ 0.4W

Ω

Ω

.022 @ 5W

.001 @ .225W

Ω

Ω

.001 @ 1.444WΩ

.001 @ 2WΩ

PLV 1

*Precision 4-Lead design eliminates contact and lead-out resistance. 2 concentrically located current leads and 2 offset potential leads. Sux letters “AL” = Aluminum Case

To #10 AWG

0.5W3APLV ½ 8.64

.340”

2W8A

7W18A

12.7.500”

38.11.500”

.036”#19

AWG12.7.500”

.022 @ 7W

.001 @ .324W

Ω

Ω

38A

10W20A

25.41.000”

38.11.500”

25.41.000”

PRCType

Max.RatingWattsAmps

Body Dimensions±.787mm (.031”)

(H)mmins.

(L)mmins.

(W)mmins.

1” LLeadDiam.

TinnedCopper

* Std. Min. Res@ Max. Watts

Special Min. Res@ Derated Power


PRCPLV1/2

PRCPLV10

PRCPLV7

PRCPLV5

PRCPLV2

PRCPLV1

LH

W

PRCPLV3

Fig. #3Derating Curve

H o w Yo u C a n P r o t F r o m P LV S h u n t s :Variable lead sizesResistance valuesVoltage drop or ohmic tolerancesTCR characteristics

............ for current-sensing to 45 Amps................................................... to 0.001

.................. to ±0.005%................15ppm/°C (std.) to 10 ppm/°C

Ω

Temperature Span ............. -65 to +275°C @ 1% toleranceFor closer tolerance see Derating Curve Fig. 3

You can select any value from 1 milliohmsto 100 Please refer to Fig. #2for Resistance vs. Tolerance ratios.

°CSpecify - LTC for 0±10ppm to +150°C

Full power ratings are based upon ±1%res. tols. at 25°C. Derating is required forcloser tolerances, higher temperatures(Fig. #3) and lower values. Refer to Std.Min. Res. @ Max. watts in above column.

To ±0.001%/yr. at 25°C (no load).

RESISTANCE VS. TOLERANCE

TCR: 0±15 ppm/ (Std.)

POWER & CURRENT RATINGS

STABILITY

Ω.

ENGINEERING DATA:

1.

3.

4.

TERMINALS

PROTECTIVE ENCAPSULATION

MARKING

All PLVs have solderable “hot-tinned”pure copper wire leads. Higher current-carrying capacity leads to #8 AWGare available for full power ratings onvalues below the Std. Min. Res. listed.

PLVs are sealed in high temp/solventresistant epoxy. Epoxy/aluminum casesare available on 7 watt & 10 watt sizes.

PRC symbol, type ohmic value andtolerance. Custom marking is available.

5.

6.

7.

To #8 AWG

PLV10

PLV7AL

2.

100

.005

.01

.02

.05

.1

101

0.1.05.02.01.001 .005

.25

.5

TN

EC

RE

PE

CN

AR

EL

OT

RESISTANCE ( )Ω

Fig. 2


7

PLV10AL 25.41.000”

38.11.500”

25.41.000”

12.7.500”

38.11.500”

12.7.500”


ISSUE NO. 42

10W

7W

8

1.

2.3.

4.

1.

2.

3.

4.

Attributes of the extremely versatile PRC100 Series include:

You can achieve dramatic results with PRC’s Compensators:

LINEAR COMPENSATION

TOLERANCE ON +3500ppm/°C.

PRC's type PT/ST (+) TCR Char.3500ppm/°C. linear trackingtemperature sensitive resistors helpyou develop the desired compensationfor true RMS measurements… and canoffset errors in dB output circuits.

>±100ppm/°C. from +25°C. to +100°C.

For example: if you arelooking for a systems oset of+3350 to +3450ppm/°C. … try afew engineering samples of our (std.)o-the-shelf compensators. We arecondent you can achieve dramatic

r The element wire usedon our type PT/STs, as a rule, is veryclose to +3350ppm/°C. at 25°C. andlower that +3450ppm/°C at 100°CPlease refer to the correspondingtracking chart - Fig #4 on pg. 9

esults.

OFF-THE-SHELF / IMMEDIATE DELIVERY

Thru-hole and SMD designs areavailable for evaluation and tests.Ask about our PT styles (or the typeAT35) for your wire lead terminalsrequired. Also, if you have plansfor SMT … our type ST35 is a drop-in replacement for the thru-hole partwith interchangeable specs.

CUSTOM COMPENSATORS

TRACKING CHART

Remember - we can customize anyof our compensators to your specsin any ohmic value with pure metals,available alloys or compositewindings. All of which are extremelylinear, reasonably priced anddelivered quickly.

Constant temperature oil bathcomputer tracking charts areavailable to match your temperaturespan and behavior specs exactly.

(Continued on Pg. 9)

5.

THE PRC100 (Std. Reference):A PLATINUM ALTERNATIVE

CRITICAL FACT TO REMEMBER:

Like a platinum RTD, the PRC100Std. is 100 at 0°C. ±0.12%with a TCR of +3850 ppm/°C.that meets the theoretical curve ofplatinum as defined by the IECStandard, pub. 751 (per DIN Std.43760, Class B) alpha = 0.00385ohm/ohm/°C. Please refer to thechart and equations on Pg. 10.

Always use a consistent BaseTemperature of Zero (0)°C in theplatinum and PRC100 equations.

Ω

Ω

For example: The nominal resistanceof a platinum RTD and the PRC100Std. is 100 at Base 0°C. Then, if weuse +100°C as the other referencepoint, the TCR is calculated to bevery close to +3850 ppm/°CThe base temperature is importantin this situation because the TCRsof all other resistance alloys are

usually calculated between Base+25°C and +100°C. Any otherreference points and resistancevalues in the TCR equations willgive you a result other than theTCR expected.

Platinum is generally oered in twogrades: the Standard AmericanReference Grade of 0.003923ohm/ohm/°C and the DIN of0.003850 ohm/ohm/°C. We haveselected the DIN Standard forour PRC100 (Std. Reference) todemonstrate our capability andthe exibility of this design forcustom high quality special-purpose sensors.

The Standard 100 reference isoffered in an assortment ofphysical sizes for thru-hole, SMD,and probe applications. If you

THE PRC100 STD. REFERENCE SERIES IS IN STOCK & READILY AVAILABLE

Ω

need a few pieces or severalthousand of any of the PRC100configurations, we can usually shipthem directly from our stock.

If you do, the PRC100 CustomSeries is actually more versatilethan a platinum RTD, becauseyou can select any ohmic valueand tolerance that you need, andadjust the TCR characteristic ...if you want a slightly higher orlower ohms change per degree C.

Let us know your exact particularsand we will custom manufacture thepart to your specs and send you asample together with a computer-tracking chart at no charge.

DO YOU NEED HIGH QUALITY“CUSTOM” SENSORS?

(Continued on Pgs 10-11)


ISSUE NO. 42

1000 3500 PPMThru-hole or SMDLow RMS NoiseLinear TrackingCustom Values & TCRs

Ω

Ω

Compensators ...................... are in stock.…................................. it’s your choice!

.................................... for A/D conversions.

..................................... from -65 to +150°C.................. for high or lower /°C.∆

d

e.g. 1000 at 25°C. is 1257.25 at +100°C.Ω Ω

TCR = R@100°C - R@25°C

1257.25 - 1000

R@25°C X 75

1000 X 75

+3430ppm/ °C or 3.4 /°C∆Ω

X 106

3430

3390

336925°C 50°C 100°C

(1000 )Ω (1257.25 )Ω

).C°/

MPP(R

CT

Fig. #4

AT35

ST35

Max.

WattsVolts

100 V0.1 W

L

ins.mm

9.14.360”

W

ins.mm

.125”3.18

a b c de

(1”L. )

Any value from 1 to 50K .Tolerances to ±0.05%.

* TC TOLERANCE WINDOW ± 5% Calculated between +25°C. & +100°C.

ALL STANDARD 1000 ± 1% TOLERANCE+3500 PPM COMPENSATORS ARE IN STOCK

TCR CHARACTERISTICS AVAILABLE

Ω

Special: Ω Ω

R X 10= R X t

6

TCRO

∆∆

= Original resistance at reference temp.= Change in resistance at test temp.

from resistance at reference temp.= Difference between test and

reference temp. in degrees.

RR

O

t

2.

3.

4.

5.

6.

AXIAL & PROBE SPECIAL-PURPOSE COMPENSATOR/SENSORS

PROBE

AXIAL LEAD & PROBE DESIGNTEMPERATURE SENSING

PRCType

PT052

PT073

PT094

PT146

SP073

SP094

SP146

L W

C

Type PT

Type ST / PTS

AA

H

H

Wc

ab

L

Type SP

Type AT / ATS

BB

PowerRating

.02 W

.05 W

0.1 W

0.25 W

0.05 W

0.1 W

0.25 W

6.86

8.43

10.03

13.21

8.43

10.03

13.21

(.270”)

(.332”)

(.395”)

(.520”)

(.332”)

(.395”)

(.520”)

1.78

2.54

3.18

4.75

2.54

3.18

4.75

(.070”)

(.100”)

(.125”)

(.187”)

(.100”)

(.125”)

(.187”)

.020”

.020”

.025”

.028”

.020”

.025”

.028”

1500

2500

6K

20K

2500

6K

20K

1K

2K

5K

10K

2K

5K

10K

25

50

100

500

50

100

500

500

600

1500

5K

600

1500

5K

100

200

500

2K

200

500

2K

Length(Ins.)

Diametermmmm (Ins.)

Body Dimensions ± .787mm (.031”) LeadLength

1.5”Max. Diam.

± 0.125” +1400ppm/°C

+3500ppm/°C

+4500ppm/°C

Maximum Resistance ( )for “Custom” +TCR Characteristics:

Ω

H

ins.mm

3.30.125”

PAD LAYOUT

.020”

.075” .075” .100” .260”

+3930ppm/°C

+6000ppm/°C

COMPENSATORS VS. POWER

STABILITY ENSURES LONGER SHELF-LIFE

PROTECTIVE SEAL

MARKING

PRC’s positive TCR resistors are usedto offset negative ambient temperaturechanges or counter self-generatingshifts in resistance with an excitation ofpower to 0.25 watt at +125°C(Derated to zero watts at +150°C)

±0.05% per year at 25°C. w/ no load.< ±0.01% per year at 25°C. w/ no load.

Conformal silicone or epoxy case.Thermal conductive insulating coatings.

PRC symbol, type, resistance value, toleranceand TCR characteristics, physical size permitting.

Standard:Special:

Standard:Special:

AXIAL

RES/TEMP CURVE & EQUATION

For nominal 1K ±1% +3500ppm device.7.

PRCType

X 106

TCR =

1.

TCR =

9

RECTANGULAR AXIAL & SMD 1K 3500 PPM COMPENSATORS

+3930ppm/°C

+6000ppm/°C

200

500

2K

600

1500

5K

50

100

500

2K

5K

10K

6.60

7.87

10.8

.260

.310

.425

2.54

2.54

2.54

.100

.100

.100

3.18

5.72

6.35

.125

.225

.250

1.91

3.18

2.54

.075

.125

.100

9.14

9.78

12.7

.360

.385

.500

3.30

6.35

6.35

.130

.250

.250

W

in.mm.

L

in.mm.

d

in.mm.

c

in.mm.

b

in.mm.

a

in.mm.

1.91

2.84

2.84

.075

.112

.112

H

in.mm

Maximum Resistance ( )for “Custom” +TCR Characteristics:

Ω

+1400ppm/°C

+3500ppm/°C

+4500ppm/°C

2500

6K

20KPTS3

PTS1

PRC TYPE

RECTANGULAR AXIAL & SURFACE MOUNT SPECIAL-PURPOSE COMPENSATOR/SENSORS

POWERRATING

.05W

.1W

.25W

PTS2

ATS1

ATS2

ATS3

AXIAL SMD

ATS1” LeadsDiameter

ATS-AXIAL PTS-SMD

.020”

.025”

.031”

.

ENGINEERING DATA:

+80 ppm/°C+140 ppm/°C+400 ppm/°C

+1400 ppm/°C+3500 ppm/°C

+3930 ppm/°C+4300 ppm/°C+4500 ppm/°C+5000 ppm/°C+6000 ppm/°C

Un-coated components are also available upon request.

How Can You Benet From Our Custom Compensators?


ISSUE NO. 42REVISED 11-10-11. SUPERSEDES ANY AND ALL PREVIOUS PUBLISHED ARTICLES.

10

-40-39-38-37-36-35-34-33-32-31-30-29-28-27-26-25-24-23-22-21-20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1012345678910111213141516171819

84.91685.29185.66586.0486.41486.78987.16487.5487.91588.2988.66689.04289.41889.79490.1790.54690.9229991.391.67692.05392.4392.80793.18593.5619993.9494.31894.69595.07395.4520195.8396.20896.58796.9649997.34497.72398.10298.48198.86199.2499.62100100.379100.759101.139101.52101.9102.281102.661103.042103.423103.804104.185104.566104.948105.329105.711106.093106.475106.857107.239

3770377137723772377337743775377537763777377737783779378037803781378237823783378437843785378637873787378737893790378937903791379237933794379537963797379638003799

3789379537963799380038013801380238033804380438053806380638073808380838093809

-0.3771-0.3772-0.3773-0.3773-0.3774-0.3775-0.3776-0.3776-0.3777-0.3778-0.3778-0.3779-0.378-0.3781-0.3781-0.3782-0.3783-0.3783-0.3784-0.3785-0.3785-0.3786-0.3787-0.3788-0.3788-0.3788--0.379-0.3791-0.379-0.3791-0.3792-0.3793-0.3794-0.3795-0.3796-0.3797-0.3798-0.3797-0.3801-0.38

0.37890.37950.37960.37990.380.38010.38010.38020.38030.38040.38040.38050.38060.38060.38070.38080.38080.38090.3809

TempDeg. C.

Value inOhms

T.C. inPPM

Avg. OhmsChg/Deg. C.

202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879

107.621108.004108.386108.769109.152109.535109.918110.301110.684111.068111.451111.835112.219112.603112.987113.372113.756114.14114.525114.91115.295115.68116.065116.45116.836117.221117.607117.993118.379118.765119.151119.538119.924120.311120.697121.084121.471121.858122.246122.633123.02123.408123.796124.184124.572124.96125.348125.737126.125126.514126.903127.292127.681128.07128.459128.849129.238129.628130.018130.408

TempDeg. C.

Value inOhms

T.C. inPPM


381038113811381238133814381438153815381638163817381838193819382038213821382238233823382438253825382638263827382838283829383038303831383238323833383438343835383638363837383838383839383938403841384138423843384338443845384538463847384738483849

0.3810.38110.38110.38120.38130.38140.38140.38150.38150.38160.38160.38170.38180.38190.38190.3820.38210.38210.38220.38230.38230.38240.38250.38250.38260.38260.38270.38280.38280.38290.3830.3830.38310.38320.38320.38330.38340.38340.38350.38360.38360.38370.38380.38380.38390.38390.3840.38410.38410.38420.38430.38430.38440.38450.38450.38460.38470.38470.38480.3849

TempDeg. C.

Value inOhms

T.C. inPPM


8081828384858687888990919293949596979899

100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150

130.798131.188131.579131.969132.36132.751133.142133.533133.924134.315134.707135.098135.49135.882136.274136.666137.058137.45137.843138.235138.628139.021139.414139.807140.2140.593140.987141.381141.774142.168142.562142.956143.351143.745144.14144.534144.929145.324145.719146.114146.51146.905147.301147.696148.092148.488148.884149.281149.677150.073150.47150.867151.264151.661152.058152.455152.852153.25153.648154.045154.443154.841155.24155.638156.036156.435156.834157.232157.631158.031158.43

38493850385138513852385338533854385438553856385638573858385838593860386038613862386238633864386438653866386638673867386838693869387038713871387238733873387438753875387638773877387838793879388038813881388238823883388438843885388638863887388838883889389038903891389238923893389338943895

0.38490.3850.38510.38510.38520.38530.38530.38540.38540.38550.38560.38560.38570.38580.38580.38590.3860.3860.38610.38620.38620.38630.38640.38640.38650.38660.38660.38670.38670.38680.38690.38690.3870.38710.38710.38720.38730.38730.38740.38750.38750.38760.38770.38770.38780.38790.38790.3880.38810.38810.38820.38820.38830.38840.38840.38850.38860.38860.38870.38880.38880.38890.3890.38900.38910.38920.38920.38930.38930.38940.3895

RESISTANCE TEMPERATURE CHARACTERISTIC (Rt)Rtalpha

ABC

is defined by IEC standard, pub. 751:= 0.00385 ohm/ohm/°C.

... For range -40°C to 0°C:Rt = R [1+At+Bt +C(t-100°C)t ]

....For range 0°C to +150°C:Rt = R (1+At+Bt )

where the constants in these equations are:= 3.79782 x 10= 6.502 x 10= 4.3735 x 10

0

0

0

2

2

2

2

2

02 3

-3

-3

3

3

7

-7 -12-3

-7

-12

Rt = R [1+At+Bt ]Rt = 100 [ 1+ (3.79782x10 x 100) + (6.502x10 x 100 )]Rt = 100 [ 1 + .379782 + .006502]Rt = 100 x 1.386284Rt = 138.628 @ 100°CRt = R [ 1 +At +Bt +C(t-100)t ]Rt = 100[ 1+ (-.1519128) + (.00104032) + (.00003918656)]Rt = 100 x .8491667Rt = 100[ 1 +(3.79782 x 10 x -40) + (6.502x 10 x -40 ) + (4.3735 x10 x (-40-100) x -40 )]Rt = 84.916 @ -40°C

Ω

Ω

TempDeg. C.

Value inOhms

T.C. inPPM


TempDeg. C.

Value inOhms

T.C. inPPM


TempDeg. C.

Value inOhms

T.C. inPPM



ISSUE NO. 42

TYPE SPTYPE PT

TYPE STTYPEATL

W

C

Type PRC100 (Std.)Type PRC100X

Type PRC100T

AA

H

H

Wc

ab

L

Type PRC100.12Type PRC100-1

Type PRC100ABB

What The PRC100 Means To You:

The PRC100 (Std. Reference) ....... 100 at 0°C.±0.12% with an average sensitivity of 0.00385ohm/ohm/°C is in-stock for immediate delivery.

Ω

1.

2.

RESISTANCE AND TOLERANCE

RESISTANCE TEMPERATURECHARACTERISTIC (Rt

PRC100 (Std. Reference):

PRC100 (Custom Series):

... for range -40°C. to 0°C:

)

100 at 0°C±0.12% (or ±0.3°C) and 138.50 at +100°C±0.22% (or ±0.8°C) per DIN 43760, Class B.

You can select anyvalue from 50 to 5 Kilohms in tolerancesfrom 1/4 DIN (±0.03%) to 2 x DIN (±0.24%).

Rt is defined by IEC Standard, pub. 751:alpha = 0.00385 ohm/ohm/°C*

Rt = [1+At+Bt + C(t-100°C)t ]

Rt = (1+At+Bt )

A = 3.79782 x 10B = 6.502 x 10C = 4.3735 x 10

Fixed points are in degrees Celsius, = 0°CThe other (Ref.) temperature is + 100°C, butany temperature can be used in the equationwith respect to Base 0°C. The PRC100 Std.Ref. follows a well-defined theoreticalcurve and linear slope from Base 0°C provingthat most reference points are calculablewithin very close tolerances (Ratio = Rt/ ).

... for range 0°C. to +150°C:

Where the constants are:

ΩΩ

Ω

R

R

R

R

O

O

O

O

2 3

2

-3

-7

-12

4.

5.

6.

3.

8.

9.

7.

ENGINEERING DATA:

PRC100 (STD. REFERENCE) 100 OHMS IN-STOCK

RECTANGULAR AXIAL & SMD 100 SENSORS

PRCType

PRCType

PowerRating

PowerRating

LENGTHA

DIAMETERB

BODY DIMENSIONS ± .787mm (.031”) LEADS(Tinned Copper) RESISTANCE &

TOL @ 0°C

RESISTANCE &TOL @ 0°C

PRC100XPRC100 (Std.)PRC100.12PRC100-1

0-.04W0-.25W0-.1W0-.25W

.275”

.600”

.450”

.600”

.113”

.188”

.156”

.188”

.023”D x 1.0”L

.029”D x 1.4”L

.023”D x .63”L

.023”D x .63”L

100 ±0.12%100 ±0.12%100 ±0.12%100 ±0.12%

ΩΩΩΩ

+3850 ppm/°C.+3850 ppm/°C.+3850 ppm/°C.+3850 ppm/°C.

Max.Volts

H

ins.mm

L

ins.mm

W

ins.mm a b c d

e (1”L)RTC

(0°C to +100°C)

PRC100APRC100T

0.1W 100V 3.18.125”

3.18.125”

9.14.360” .075” .075” .100” .260”

.020”100 ±0.12%Ω +3850 ppm/°C.

STABILITY OF CALIBRATION

STABILITY (R ) VS. TIME

POWER RATINGS VS. AMBIENTTEMPERATURE RANGE

THERMAL TIME CONSTANT

All PRC100 sensors are closely matchedand repeatable part-to-part. They are ableto consistently reproduce output readingsconsecutively at the same temperaturereference points ... under the sameconditions and in the same direction.

The change in the original resistance ( )at 0° C after 10 cycles to +150°C is lessthan ±0.1°C or ±0.038% max. Shelf lifestability is ± 0.002%/yr. at 25°C (no load).

The PRC100 is ideal as a compensatorto offset drift or negative self-generatingchanges in resistance as a result of anexcitation of power to 0.25 watt at +125°Cto zero power at +150°C.

The time required for the PRC100 sensorto indicate 63.2% of a new impressedtemperature from a step change of 0°Cto +100°C can be customized to < 1 second

O

RO

PRC100 (Std. Ref.) CONSTRUCTION

MARKING (Std. Reference)

CUSTOM APPLICATIONS

Wire: Ni, Co, Mn & Fe.Substrate: Epoxy or ceramic form.Terminals: Solderable hot-tinned copper.Protective Seal: Moisture and solventresistant epoxy.

areavailable in any ohmic value with TCRsfrom +3000ppm to +4000ppm/°Cin 50ppm steps with the same lineartracking characteristics as the Std. Ref.

e.g:1K ohms = PRC100010K ohms = PRC10000, etc.

Theoretical curve and slope are basedupon values of the International PracticalTemperature Scale (IPTS-68 & 90).

PRC100 (Custom) Series Sensors

Custom Marking:

*

PRC100XPRC100APRC100T

PRC100±0.12%

TC.385%

PRC100.12 PRC100-1TC.385% ±0.12%

TC.385%

PAD LAYOUTd

RTC(0°C to +100°C)

11


ISSUE NO. 42

BODY DIMENSIONS ± .787mm (.031”)

± 0.125”

± 0.125”

The PRC100 Custom Series is more than aplatinum alternative because of its versatility.


ENGINEERING DATA:


TEMPERATURE COEFFICIENT OFRESISTANCE ALSO KNOWN AS T.C.R.

STABILITY VS. TIME CHARACTERISTICS

Select any ohmic value or decimal part ofan ohm desired with tolerances to ±0.05%.

0±10ppm/°C (100 and above).0±15ppm/°C (values below 100 ).For specific TCRs to ±1ppm/°C see page 5.Refer to page 9 for TCRs to +6000ppm/°C.

To ±0.005%/year at +25°C. with no load.

Standard: ΩΩ

1.

2.

3.

4.

5.

POWER RATINGS VS. AMBIENT TEMP.AND RESISTANCE TOLERANCE

INDUCTANCE

“N”

Full power ratings are based upon standard±1% resistance tolerances. Derating isrequired for higher temperatures and closerresistance tolerances.

+145°C.

The standard type SX resistorsare inductively wound. Non-inductivewindings are available - add suffix letter

in the part number.

Max Temperature for SX Coating:

8.

7.

6. TERMINALS

PROTECTIVE COATING

MARKING

Standard: Solderable hot-tinned pure copper leads.

Solvent resistant silicone/epoxy seal.

PRC symbol, type, value andtolerance.

.03W

.04W

.05W

.06W

.07W

.1W

.1W

.125W

.166W

.166W

.2W

.2W

.2W

.25W

.25W

.33W

.33W

.33W

.5W

.5W

.5W.

.5W

.6W

.8W1W1.25W1.33W1.5W2W3W5W

25V35V50V45V65V85V

100V125V165V165V200V200V200V250V250V330V330V330V500V500V500V500V600V800V

1000V1000V1000V1000V1250V1250V1500V

5.596.868.436.868.438.43

10.0311.6111.618.43

13.2110.038.43

10.0311.6113.2110.0311.6116.3814.7811.6113.2116.3819.5619.5622.7325.9122.7329.0841.7851.31

(.220”)(.270”)(.332”)(.270”)(.332”)(.332”)(.395”)(.457”)(.457”)(.332”)(.520”)(.395”)(.332”)(.395”)(.457”)(.520”)(.395”)(.457”)(.645”)(.582”)(.457”)(.520”)(.645”)(.770”)(.770”)(.895”)

(1.020”)(.895”)

(1.145”)(1.645”)(2.020”)

(.050”)(.080”)(.080”)(.090”)(.090”)(.115”)(.115”)(.115”)(.130”)(.145”)(.130”)(.145”)(.160”)(.176”)(.176”)(.176”)(.190”)(.190”)(.176”)(.190”)(.207”)(.207”)(.207”)(.240”)(.332”)(.300”)(.332”)(.437”)(.437”)(.437”)(.437”)

1.272.032.032.292.292.292.292.293.33.683.33.684.064.474.474.474.834.834.474.835.265.265.266.108.437.628.43

11.1011.1011.1011.10

0

0

.020”

.020”

.020”

.020”

.020”

.025”

.025”

.025”

.025”

.025”

.025”

.025”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

1.01.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.01*0.01*0.01*0.10.10.10.10.250.50.50.5

3K17K20K25K30K35K50K60K75K40K100K50K50K100K100K140K130K135K450K400K135K150K450K511K750K11.251.5234

MEGMEG

MEGMEGMEGMEG

5K30K50K35K65K75K100K180K210K120K280K160K130K200K300K400K220K350K600K540K360K480K720K1.11.61.822.53.556

MEGMEGMEG

MEGMEGMEG

MEGMEG

Resistance ( )Ω

Min. Max.Standard

Max.Special*

(A) Length (B) Diametermm

±1.57mm

±.787(ins)

±.062”(ins)

±.031”

ER

P =

Max.Watts

2E= PR

Max.Volts

LeadLength

1.5”Max. Diam.

± 0.125”

B A

*0.01 to 0.1 and maximum special resistance values available in non-standard physical sizes -0+.062”tCommercially pure copper (Electrolytic Tough Pitch/Oxygen-Free High Conductivity).

Ω Ω

PRECISION RESISTOR CO., INC.10601 75TH Street North, Largo, Florida 33777-1421 U.S.A.Tel: 727-541-5771 Fax: 727-546-9515Email: [email protected] Site: http://www.precisionresistor.com12

.................................... from 0.01 to 6 MΩ................................................. to ±0.05%

................................ 0±10 ppm/°C. ................................... -55°C. to +145°C.

ValuesTolerancesTCR Characteristic Temperature......

Ω

The Widest Range of Custom Precision Wire Wounds You’ll Find Anywhere!

For RES. TOL. ± 0.5%

For RES. TOL. ± 1%

For RES. TOL. ± 0.25%, ± 0.1 %


100

75

50

3525

10

0

TN

EC

RE

PR

EW

OP

DE

TA

RF

O)

TU

PNI-S

TT

AW(

132125 130 135 140 145

CHARACTERISTICC

COMBINED TEMP. OF SELF-HEATING AND AMBIENT (IN °C.)

FIG. #1DERATING

CURVESeries Attributes Include:

INDUCTIVE NON-INDUCTIVESX030SX062SX063SX072SX073SX093SX094SX095SX105SX123SX106SX124SX143SX154SX155SX156SX174SX175SX158SX177SX185SX186SX188SX2210SX3110SX2812SX3114SX3712SX3716SX3724SX3730

SX030NSX062NSX063NSX072NSX073NSX093NSX094NSX095NSX105NSX123NSX106NSX124NSX143NSX154NSX155NSX156NSX174NSX175NSX158NSX177NSX185NSX186NSX188NSX2210NSX3110NSX2812NSX3114NSX3712NSX3716NSX3724NSX3730N

REVISED 5-24-12. SUPERSEDES ANY AND ALL PREVIOUS PUBLISHED ARTICLES.

.03W

.04W

.05W

.06W

.07W

.1W

.1W

.125W

.166W

.166W

.2W

.2W

.2W

.25W

.25W

.33W

.33W

.33W

.5W

.5W

.5W.

.5W

.6W

.8W1W1.25W1.33W1.5W2W3W5W

25V35V50V45V65V85V

100V125V165V165V200V200V200V250V250V330V330V330V500V500V500V500V600V800V

1000V1000V1000V1000V1250V1250V1500V

5.596.868.436.868.438.43

10.0311.6111.618.43

13.2110.038.43

10.0311.6113.2110.0311.6116.3814.7811.6113.2116.3819.5619.5622.7325.9122.7329.0841.7851.31

(.220”)(.270”)(.332”)(.270”)(.332”)(.332”)(.395”)(.457”)(.457”)(.332”)(.520”)(.395”)(.332”)(.395”)(.457”)(.520”)(.395”)(.457”)(.645”)(.582”)(.457”)(.520”)(.645”)(.770”)(.770”)(.895”)

(1.020”)(.895”)

(1.145”)(1.645”)(2.020”)

(.050”)(.080”)(.080”)(.090”)(.090”)(.115”)(.115”)(.115”)(.130”)(.145”)(.130”)(.145”)(.160”)(.176”)(.176”)(.176”)(.190”)(.190”)(.176”)(.190”)(.207”)(.207”)(.207”)(.240”)(.332”)(.300”)(.332”)(.437”)(.437”)(.437”)(.437”)

1.272.032.032.292.292.292.292.293.33.683.33.684.064.474.474.474.834.834.474.835.265.265.266.108.437.628.43

11.1011.1011.1011.10

0

0

.020”

.020”

.020”

.020”

.020”

.025”

.025”

.025”

.025”

.025”

.025”

.025”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.028”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

.032”

1.01.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.01*0.01*0.01*0.10.10.10.10.250.50.50.5

3K17K20K25K30K35K50K60K75K40K100K50K50K100K100K140K130K135K450K400K135K150K450K511K750K11.251.5234

MEGMEG

MEGMEGMEGMEG

5K30K50K35K65K75K100K180K210K120K280K160K130K200K300K400K220K350K600K540K360K480K720K1.11.61.822.53.556

MEGMEGMEG

MEGMEGMEG

MEGMEG

ISSUE NO. 42

RESISTANCE RANGE

CUSTOM TOLERANCES

TCR CHARACTERISTIC

PRC's sub-miniature type SM “precisionpower” resistors offer the widest range ofohmic values anywhere.You can select any value or decimal partof an ohm from 0.02 to 4 Megohms.

±1%(Std.), ±0.5%, ±0.25%, ±0.1%

0±10ppm/°C for 100 andabove and 0±15ppm/°C below 100 .

*Must Specify Temp. Span of Operation.

Ω

ΩΩ

Standard:

VOLTAGE RATING

PRECISION POWER RATINGS

DC Voltage or Peak Voltage:The type SM’s high operating voltagewinding patterns eliminate dangerouscrossovers and potential problems usuallyassociated with standard style bobbins andmandrel designs. To calculate the safeoperating voltage for any resistance valuebelow the maximum listed,apply the formula: E= PR.

All standard ±1% tolerance type SMresistors are designed for continuous fullload operation at +25°C. Derated to zerowattage at +275°C (see Fig. #5 above).

ENGINEERING DATA:

1. 4.

5.

6.

7.

8.

SM041

SM062

SM063

SM094

SM076

SM156

SM1711

SM186

SM177

SM228

SM2812

SM3114

SM3726

PRC041

PRC062

PRC063

PRCSM 094

PRCSM 076

PRCSM 156

PRCSM 1711

PRCSM 186

PRCSM 177

PRCSM 228

PRCSM 2812

PRCSM 3114

PRC

SM 3726

TWO (2) TERMINALPRC

TYPE

For higher resistance values (at max. rated voltage) decrease max. power rating (P=E /R)For lower resistance values (at max. rated power) decrease max. voltage rating (E= PR)*Resistance values based upon max. power and max. voltage.

RW70

RW69

RW79

RW74

RW67

0.125W

0.25W

1W

1.125W

1.5W

2W

3W

3W

3W

5W

6.5W

10W

1.0

1.0

0.1

0.1

0.1

0.1

0.1

*0.025

0.1

*0.02

*0.02

0.1

*0.07

5K

17K

24K

40K

53K

90K

80K

80K

120K

200K

154K

156K

225K

10K

30K

80K

180K

400K

900K

480K

540K

720K

1 MEG

1.5 MEG

50K

4 MEG

25V

65V

110V

200V

245V

375V

670V

500V

500V

600V

1000V

1000V

1250V

6.35

6.35

7.92

10.31

12.7

13.49

20.62

12.7

14.27

15.88

22.23

25.4

45.21

(.250”)

(.250”)

(.312”)

(.406”)

(.500”)

(.531”)

(.812”)

(.500”)

(.562”)

(.625”)

(.875”)

(1.000”)

(1.780”)

1.52

2.03

2.03

2.92

2.29

4.47

4.83

5.26

4.83

6.10

7.92

8.43

10.03

(.060”)

(.080”)

(.080”)

(.115”)

(.090”)

(.176”)

(.190”)

(.207”)

(.190”)

(.240”)

(.312”)

(.332”)

(.395”)

.020”

020”

.020”

.025”

.020”

.028”

.028”

.028”

.028”

.032”

.032”

.032”

.032”

RWStylesMILR-26

MaxPowerRating(Watts)

*Min.Allowable

Resist.*(Ohms)

*Max.Allowable

Resist.*(Ohms)

Resist.(R=E /P)

Max.VoltageRating mm mm(ins.) (ins.)

Length Diameter

Body Dimensions ±.787mm (.031”)

LeadLength1.5”

Max.Diam.

±0.125”

* 0.02 to 0.1 and maximum resistance values available in non-standard physical sizes 0 to +.0625”.All low value 2-terminal designs are calibrated and tested at mid-point on lead unless otherwise specified.

Ω Ω

2.

3.

2

2

0.5W

RW78

INDUCTANCE

TERMINALS

PROTECTIVE SEAL

Inductively woundNon-inductive winding

is available, simply add suffixletter “N” to the end of part number.

Solderable hot-tinned pure copper leads.

SM resistors are coated in atough solvent resistant high-temperature siliconeformulation … with indeliblemarking.

Standard:Special:

Standard:

Sub-miniature high valuesToleranceTCR CharacteristicHigh voltage ratingLow EMF construction

......... to 4 Megohms............................................ to ±0.1%

......................... 0+10ppm/°C......................... to 1250 Volts

............. Vs. copper leads


13


ISSUE NO. 42

Fig. 5DERATING

CURVE

RESISTANCETol. ±1%

100

80

60

40

20

025 75 125 175 225 275

±1/10%

±1/4%

±1/2%

FO

PER

CE

NT

RA

TE

DPO

WE

R

AMBIENT TEMPERATURE IN °C.


Prot from Precision Power SM Series


For specific TCRs to ±1ppm/°C see page 5.Refer to page 9 for TCRs to +6000ppm/°C.

ENGINEERING DATA:

3.

4.

* Heavier current carrying capacity leads are available for low resistance - full power applications. Refer to Type PLV for custom millivolt drop requirements.

6.

Precise low-value repeatability. Eliminates lead-out and contact resistance. "Single joint” design makes lead identification academic.

1.4”L*Standard

Min. ResistanceSpecial*

Min. Resistance* FOUR (4) TERMINAL Std.Lead

SpaceLeadDiam.

±.001”Max. Watts

WDerated Power

W

Length Diameter

mmmm (ins.)(ins.)

SM155-4 (.520") 5.08 (.200”) .150” .0285” .015 @ 1.25W .001 @ .1W10A

SM186-4 16.5 (.650”) 6.35 (.250”) .150” .025 @ 2.5W .001 @ .1W10A

3W 19.69 (.775”) 7.11 (.280”) .150” .0285”

.0285”

.0285”

.03 @ 3W .001 @ .1W10A

SM2212-4 4W 26.04 (1.025”) 7.11 (.280”) .150” .028 @ 4W .001 @ .14W12A

SM2812-4 5W 26.04

45.72

(1.025”) 9.52

11.10

(.375”) .180” .032” .02 @ 5W .001 @ .22W15A

SM3724-4 (1.800”) (.437”) .243” .032” .03 @ 7.5W .001 @ .22W15A

Body Dimensions ± 0.787mm (.031”)

13.21

RESISTANCE ( )Ω

2.

1. 5.

7.

PRCSM 155-4

PRCSM 186-4

PRCSM 228-4

PRCSM 2212-4

PRCSM 2812-4

PRCSM 3724-4

7.5 W

Max.RatingWatts

Amps

Shunt Values

TCR CharacteristicStability

..........................

to ±0.005%.................................... 0±15ppm/°C

........................................................ to ±0.005%/year

... from 0.015 (at full power).................. to 0.001 (derated watts)

............................................................Lower Shunt ValuesTolerances

ΩΩ

.005

.01

.02

.05

.1

.25

Fig. 6

.01 .02.05

0.11

10 100.001 .005

TN

EC

REP

EC

NA

RE

LO

T


eliminated by using a 4-terminaldevice, because 4-Wire circuitswill only indicate the voltage dropacross the resistor.

PRC's type SM-4 has foursolderable hot-tinned copper wireleads. Lead identification isacademic because of its single-joint construction. However foruniformity, while observing thePRC marking on the body of theresistor, select the 2 leads closestto the top for your sense leads andthe other two as the current leads.

FOUR TERMINALS

POWER & CURRENT RATING

TWO-TERMINAL VS. FOUR-TERMINAL (Kelvin)

The Standard Minimum Resistance at fullpower (see above column) is based upon±1% resistance tolerance at +25 C.Derating is required for lower res. values,closer tolerances and higher temperatures.Please refer to Fig. # 7 at top of the page.

Two-terminal resistors are generally usedfor high ohmic values, where the effects oflead-out resistance and contact resistanceare minimal. Allow approximately ±0.001ohm per inch for the lead-out resistance on2-Wire designs. However, on low valueswhere lead resistance can be part of a veryaccurate measurement, the adder may be

°


TCR CHARACTERISTICS

STABILITY VS. TIME CHARACTERISTICS

SOLVENT RESISTANCE COATING

Any ohmic value or decimal part ofan ohm desired from 0.015 to 100 withtolerances to ±0.005%.

From 0.001 through 0.015 withtolerances to ±0.1%. Please see Fig. 6Resistance Vs. Tolerance ratios above.

0±15 ppm/ C. between 25 & 100°C.

To ±0.001% per year at +25 C. with no load.

… with indelible marking.

Standard:

Special:

Standard:

Ω Ω

Ω Ω

°

°


.5

SM228-4

1.25 W

2.5 W

PRCType

Ω Ω

14

TYPE SM-4 FOUR TERMINAL SERIES AT A GLANCE:

@ @


ISSUE NO. 42

Fig. 7DERATING

CURVE

RESISTANCETol. ±1%

100

80

60

40

20

025 75 125 175 225 275

±1/20%

±1/10%

±1/4%

±1/2%

FO

PER

CE

NT

RA

TE

DPO

WE

R

AMBIENT TEMPERATURE IN °C.

FULL RATED POWER & CURRENT FOR ± 1% RES. TOL.*

±0.02%, 0.01%, 0.005% = 10% Published to +50°C Maximum Power

*BOTH MAX POWER & MAX CURRENT PUBLISHED MUST BE DE-RATED FOR TOLERANCES CLOSER THAN ± 1%

±0.50”


Length ............................ 1.50"Height ........................... 2.00"Width ............................ 0.65"Terminals ......................... 0.75"(Center-to-center) .

PHYSICAL SPECS:

100

.005

.01

.02

.05

.1

101

0.1.05.02.01.005

.25

TN

EC

RE

PE

CN

AR

EL

OT

RESISTANCE ( )Ω

Fig. 2


Min. Resistance Vs. Resistance Tol.

Resistance Value

Temperature Span

......... from

................... -65 to +275

0.001 to 100....................................... to 0.005%

............to 10ppm/ CTolerancesTCR Characteristics

Ω Ω±

± °°C

.......................... to 50 Amps Max.for power or current-sensing

DC Current2 & 4 Terminals

What Type MS means to you:

(0.001Ω ±0.5% shunt) lets you quicklytest current up to 40 Amps with

a standard multimeter.

Type MS-40The MS Series Shunts can be custom-made

for 50mV & 100mV applications. The valuesbelow are typical values for the 50mVshunts using the :Volt Drop Method

Input/Output Conversion Chart

1 Amp = 1mV

Amps = 5mVs7 Amps = 7mVs

10 Amps = 10mVs20 Amps = 20mVs30 Amps = 30mVs40 Amps = 40mVs

2 Amps = 2mVs5

POWER RATINGS: 10 WATTS MAXIMUM

RESISTANCE AND TOLERANCES:

TCR CHARACTERISTICS:

TERMINALS:

MARKING:

All resistance values at full power are based upon±1% resistance tolerance at 25°C. Derating is requiredor higher temperatures and/or closer tolerances.

0.001 to 100 in any specified value ordecimal part of an ohm - to ±0.005% - see Fig. 2(Min. Resistance vs. Resistance Tolerance).

to 0±10 ppm/°C

Heavy-duty commercially pure copper test leads matchcurrent rating of shunt selected. Also Four(4) low EMFcopper terminals are available for very accurate current-sensing applications.

PRC symbol, type, resistance, value, tolerance andterminal. Custom marking, if specified.

Ω Ω

Ωe.g. MS-40A = 0.001 (to 40 amps).

ENGINEERING DATA:

I = (E/R), (P/E), ( P/R) (E /R), (EI), (I R)(E/I), (E /P), (P /I) (IR), (P/I), ( PR)

P ==E=R 2

2

2

2

5.

4.

3.

2.

1.

15

The MC-7 Digital Multimeter Calibrator is a packaged group of seven (7) High-Precision resistors part # HR3716N,with ohmic values ranging from 1.0 to 1Megohm - used in the verification and adjustment of the resistance

function of 3½ and 4½ digital multimeters. To your advantage, the MC-7 is always in-stock … ready for delivery.Ω

VALUES & TOLERANCES

1 ............... 0.02%10 ............. 0.02%100 ........... 0.01%

ΩΩΩ

ΩΩ

ΩΩ

1K ............. 0.01%10K ............ 0.01%100K ..... 0.01%1MEG ........ 0.01%

Length ........... 25.40mm (1.00”)Diameter ....... 9.53mm (.375”)Leads ............ 0.032” dai X 1.0” long

HR3716N PHYSICAL SPECS:

D.C. mV METER SHUNT

The seven (7) resistors are containedin a plastic case with the leads extendingthrough the sides - ready to go to work.

FOR YOUR CONVENIENCE

Ω

0.001 50A 2.50W0.002 25A 1.25W0.003 16.7A 0.83W0.004 12.5A 0.62W0.005 10A 0.5W0.006 8.3A 0.42W0.007 7.14A 0.36W0.008 6.25A 0.31W0.009 5.5A 0.28W0.010 5A 0.25W0.020 2.5A 0.125W0.025 2A 0.1W0.030 1.67A 0.08W0.040 1.25A 0.06W0.050 1A 0.05W0.100 0.5A 0.025W0.200 0.25A 0.0125W0.250 0.2A 0.01W0.500 0.1A 0.005W1.00 0.05A 0.0025W

(R) Current (I) Watts (P)

OHM’S LAW FORMULAS


ISSUE NO. 42


ISSUE NO. 42

AUSTRALIA

AUSTRIA

BELGIUM

CANADA

CHINA

GL Tech Pty Ltd

Weltronic GmbH

Lab Electronics BVBA

Seamax Engineering Pte Ltd

PO Box 316Moorabbin Post Office, Victoria,Australia 3189Tel: 03 9592 4958Fax: 03 9592 4984email:

Leuchtenbergring 581677 Munich/GermanyTel: +49-89 492066Fax: +49-89 496234email:www.weltronic.de

Diepenbekerweg, 8/3B-3500 Hasselt, BelgiumTel: 0032/11/27 28 00Fax: 0032/11/27 58 39email: saleswww.labelec.be

email:

No. 128 Donghuan Road, Unit B302, 3FZhongxin City, Suzhou,Jiangsu Province, P.R. ChinaPostal Code: 215021Tel: 0512-6750 1076Fax: 0512-6725 8318email:www.seamax.com.sg

[email protected]

[email protected]

@labelec.be

[email protected]

[email protected]

Eli Manis Inc.8515 Place Devonshire, Suite 202AMontreal, Quebec,Canada H4P 2K1Tel: 514-484-2923Fax: 514-731-9999

SINGAPORE

SOUTH KOREA

SWEDEN

SWITZERLAND

TAIWAN

UNITED KINGDOM


IDE-MATERIAL AB

SM Handels AG

Jin Zon Enterprise Co., Ltd.

Variohm-EuroSensor Limited

61 Kaki Bukit Ave 1 #04-38Shun Li Industrial ParkSingapore 417943Tel: (65) 6547 1828Fax: (65) 6547 1829email:www.seamax.com.sg

Onskarby 205SE 815 91 Tierp

Sweden

Tel: 46 293 530 80

Fax: 46 293 530 83

email:www.ide-material.se

Industriestrasse 2Dallikon, Switzerland 8108Tel: +41 44 844 06 08Fax: +41 44 844 57 44email: [email protected]

4F-3, Number 171, Sec. 2,Chang-An East Ed.,Taipei 10490, TaiwanTel: 886-2-27111093Fax: 886-2-27310902email:www.jinzon.com.tw

Williams Barns Tiffield Rd.Towcester, Northants,UK NN12 6HPTel: 44 1327 351004Fax: 44 1327 353564email:www.variohm.com

[email protected]

[email protected]

[email protected]

[email protected]

NORWAY

PO Box 135N-1801 Askim, NorwayTel: +47 64 80 27 70Fax: +47 64 80 27 89email:www.linknordic.com

1109 11F Hyundai Bldg, 35-1, Mapo-DongMapo-Gu, Seoul, Korea 121-737Tel: 82 2 795 7667Fax: 82 2 6008 6892Email:www.enpower.kr

Link Nordic AS

ENPower Co., Ltd.

[email protected]

[email protected]

GREECE

HONG KONG

HUNGARY

INDIA

ISRAEL

ITALY

MALAYSIA

Drogeta Engineering

Jin Zon Enterprise Co., Ltd.

Weltronic GmbH

Relcom Components Ltd.

FINDIS S.r.l


51 Aharnon StreetAthens, GR104 39, GreeceTel: +30-210-8810948Fax: +30-210-8840376email:

4F-3, No. 171, Sec. 2,Chang-An East Road.,Taipei 10490, TaiwanTel: 886 2 27 11 1093Fax: 886 2 2731 0902email:www.jinzon.com.tw

Leuchtenbergring 581677 Munich/GermanyTel: 089 492066Fax: 089 496234email:www.weltronic.de

email:www.seamax.com.sg

P.O. Box 27Kibbutz Shefayim 60990, IsraelTel: 972-9-958-7070Fax: 972-9-958-3535email:www.relcom-comp.co.il

Via Edison, 21720019 Settimo Milanese (Milano), ItalyTel: 39 02 48910020Fax: 39 02 48910053email: [email protected]

No. 1, Jalan Batu Uban #1C-18-0111700 Penang, MalaysiaTel: 604-659 1828Fax: 604-659 6388email:www.seamax.com.sg

[email protected]

[email protected]

[email protected]

[email protected]

[email protected]

Seamax Engineering Pte Ltd.#703, 'A' Wing, Mittal Tower,M.G. Road, Bangalore560 001, IndiaTel: 91-080-4132-0893 ext 25

[email protected]

SPAIN

Variohm-EuroSensor LimitedWilliams Barns Tiffield Rd.Towcester, Northants,UK NN12 6HPTel: 44 1327 351004Fax: 44 1327 353564email:www.variohm.com

[email protected]

FRANCE

BICEL-TECHNOWORLD210 Rue du Polygone72058 Le Mans Cedex 2, FranceTel: + 33 2.43.40.66.07Fax: + 33 2.43.40.00.95email:www.technoworld.fr

[email protected]

KAZAKHSTAN

Abtronics, Inc.129626 Moskva, Novoalekseevskay St., 16Building 29, Office 28 MoscowTel: +8 727 318 5123

email: [email protected]

UKRAINE

Abtronics, Inc.129626 Moskva, Novoalekseevskaya St., 16

Tel: +38 057 780 0106


POLAND

Weltronic GmbHLeuchtenbergring 581677 Munich/GermanyTel: 089 492066Fax: 089 496234email:

www.weltronic.de

[email protected]

RUSSIAN FEDERATION

Abtronics, Inc.129626 Moskva, Novoalekseevskaya Ste. 16

Building 29, Office 28 MoscowTel: +7 495 225 2267


GERMANY

Weltronic GmbHLeuchtenbergring 581677 Munich/GermanyTel: 089 492066Fax: 089 496234email:www.weltronic.de

[email protected]

FINLAND

Oy Nylund GroupMasalantie 37502430 Masala, FinlandTel: +35 8 9 22191400Fax: +35 8 9 22191444email: [email protected] www.nylund.fi

DENMARK

Vallentin Elektronik A/SDam Enge 8DK-3660 Stenloese, DenmarkTel: +45 4717 2417Fax: +45 4717 1518email:www.vallentin.dk

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CZECH REPUBLIC

Weltronic GmbHLeuchtenbergring 581677 Munich/GermanyTel: +49-89 492066Fax: +49-89 496234email:www.weltronic.de

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PHILLIPINES

Jin Zon Enterprise Co., Ltd.4F-3, Number 171, Sec. 2,Chang-An East Ed.,Taipei 10490, TaiwanTel: 886-2-27111093Fax: 886-2-27310902email:www.jinzon.com.tw

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VIETNAM

Jin Zon Enterprise Co., Ltd.4F-3, Number 171, Sec. 2,Chang-An East Ed.,Taipei 10490, TaiwanTel: 886-2-27111093Fax: 886-2-27310902email:www.jinzon.com.tw

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Bldg. 29, Office 28 Moscow

prc catalog issue no 42 (ppre-flight)many other resistor types on the market require at least2or...

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