xlamp mt-g2 and mk-r leds - cree led

SOLDERING & HANDLING

Cree LED / 4400 Silicon Drive / Durham, NC 27703 USA / +1.919.313.5330 / www.cree-led.com

© 2013-2021 Cree LED. The information in this document is subject to change without notice. Cree® and the Cree logo are registered trademarks, and the Cree LED logo is a trademark, of Wolfspeed, Inc. XLamp® is a registered trademark of Cree LED. Other trademarks, product and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree-led.com.

CLD-AP75REV 6A 1

XLamp® MT-G2 and MK-R LEDs

INTRODUCTION

This application note applies to XLamp® MT-G2 and MK-R LEDs,

which have order codes in the following formats.

MTxxxx-xx-xxxx-xxxxxxxxx

MKxxxx-xx-xxxx-xxxxxxxxx

This application note explains how XLamp MT-G2 and MK-R LEDs

and assemblies containing these LEDs should be handled during

manufacturing. Please read the entire document to understand

how to properly handle XLamp MT-G2 and MK-R LEDs.

TABLE OF CONTENTS

Handling XLamp® MT-G2 and MK-R LEDs .......................................2

Circuit Board Preparation & Layouts ................................................4

Case Temperature (Ts) Measurement Point ....................................5

Notes on Soldering XLamp® MT-G2 and MK-R LEDs ......................5

Moisture Sensitivity ..........................................................................7

Low Temperature Operation .............................................................7

XLamp® MT-G2 and MK-R LED Reflow Soldering

Characteristics ..................................................................................8

Chemicals & Conformal Coatings ....................................................9

Assembly Storage & Handling ....................................................... 10

Tape and Reel ................................................................................. 11

Packaging & Labels ....................................................................... 12

http://www.cree-led.com

XLAMP® MT-G2 & MK-R LED SOLDERING & HANDLING


CLD-AP75REV 6A 2

HANDLING XLAMP® MT-G2 AND MK-R LEDS

Manual HandlingUse tweezers to grab XLamp MT-G2 or MK-R LEDs at the base. Do not touch the lens with the tweezers. Do not touch the lens with fingers.

Do not push on the lens.

Do not apply more than 1000 g of shear force directly onto the lens. Excessive force on the lens could damage the LED.

Cree LED recommends the following at all times when handling XLamp MT-G2 or MK-R LEDs or assemblies containing these LEDs:

• Avoid putting mechanical stress on the LED lens.

• Never touch the optical surface with fingers or sharp objects. The LED lens surface could be soiled or damaged, which would affect

the optical performance of the LED.

• Cree LED recommends always handling XLamp MT-G2 or MK-R LEDs with appropriate ESD grounding.

• Cree LED recommends handling XLamp MT-G2 or MK-R LEDs wearing clean, lint-free gloves.

X WRONG

PCORRECT



CLD-AP75REV 6A 3

Whenever possible, Cree LED recommends the use of the following pick and place tool to remove XLamp MT-G2 LEDs from the factory

tape and reel packaging.

All measurements are ±.13 mm unless otherwise indicated.

Whenever possible, Cree LED recommends the use of the following pick and place tool to remove XLamp MK-R LEDs from the factory

tape and reel packaging.


HANDLING XLAMP® MT-G2 AND MK-R LEDS - CONTINUED



CLD-AP75REV 6A 4

CIRCUIT BOARD PREPARATION & LAYOUTS

Printed circuit boards (PCBs) should be prepared and/or cleaned according to the manufacturer’s specifications before placing or

soldering XLamp MT-G2 or MK-R LEDs onto the PCB. The diagrams below show the recommended PCB solder pad layout for XLamp

MT-G2 LEDs.


The diagrams below show the recommended PCB solder pad layout for XLamp MK-R LEDs.


SIZE

TITLE

OF

REV.

SHEETC

DRAWING NO.

DATE

DATE

DATE

CHECK

FINAL PROTECTIVE FINISH

MATERIAL

APPROVED

DRAWN BY

SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558

4600 Silicon DriveDurham, N.C 27703

UNAUTHORIZED PERSON WITHOUT THE WRITTEN CONSENTMAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT CONTAINED WITHIN ARE THE PROPRIETARY ANDCREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION

OF CREE INC.

NOTICE

X° ± .5°.XXX ± .25.XX ± .75.X ± 1.5

FOR SHEET METAL PARTS ONLY

.XX ± .25

.XXX ± .125X° ± .5°

UNLESS OTHERWISE SPECIFIEDDIMENSIONS ARE IN

MILLIMETERS AND AFTER FINISH.TOLERANCE UNLESS SPECIFIED:

SURFACE FINISH: 1.6

8.90

8.90

6.00

.95.95

.50.50

9.11

9.11

R4.10

.65

4.85±.25

8.90REF.

8.90REF.

.95.50

6.00

8.90

8.90

8.90

8.90

.30

.95 .95

1.35 .25

.58

1.35

1.23

.25

1/19.000B2610-00025

MT-G2 OUTLINE

5/14/12D. CRONIN

REVISONSREV DESCRIPTION BY DATE APP'D A INITIAL RELEASE DC 5/14/12B ADDED ALTERNATE VIEW/UPDATED STENCILDC 8/19/15

RECOMMENDED PC BOARD SOLDER PAD RECOMMENDED STENCIL PATTERN(HATCHED AREA IS OPENING)

ALL DIMENSIONS ARE ± .13MM UNLESS OTHERWISE NOTED

PRIMARY

ALTERNATIVE

8.90REF.

8.90REF.

SIZE

TITLE

OF

REV.

SHEETC

DRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY

SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

X° ± .5°.XXX ± .25.XX ± .75.X ± 1.5


.XX ± .25

.XXX ± .125X° ± .5°



SURFACE FINISH: 1.6

8.90

8.90

6.00

.95.95

.50.50

9.11

9.11

R4.10

.65

4.85±.25

8.90REF.

8.90REF.

.95.50

6.00

8.90

8.90

8.90

8.90

.30

.95 .95

1.35 .25

.58

1.35

1.23

.25

1/19.000B2610-00025

MT-G2 OUTLINE

5/14/12D. CRONIN

REVISONSREV DESCRIPTION BY DATE APP'D A INITIAL RELEASE DC 5/14/12B ADDED ALTERNATE VIEW/UPDATED STENCILDC 8/19/15

RECOMMENDED PC BOARD SOLDER PAD RECOMMENDED STENCIL PATTERN(HATCHED AREA IS OPENING)

ALL DIMENSIONS ARE ± .13MM UNLESS OTHERWISE NOTED

PRIMARY

ALTERNATIVE

8.90REF.

8.90REF.

Recommended PCB Solder Pad Recommended Stencil Pattern(Shaded Area Is Open)

Recommended PCB Solder Pad

SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY

THIRD ANGLE PROJECTION

SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300

Fax (919) 313-5558



OF CREE INC.

NOTICE

X° ± .5 °.XXX ± .25.XX ± .75.X ± 1.5


.XX ± .25

.XXX ± .125X° ± .5 °



SURFACE FINISH: 1.6

7.00

7.00

.73

4.08

R3.25

6.70

6.76REF.

6.76

6.70

3.90

.70.70

6.76

6.70

1.24

1.29

.25

.70.25

1.29

6.76REF.

6.70REF.

6.70

6.76

.70 .70

3.90.70

1/111.000

E2610-00031

MKR Marketing Spec

11/7/12D. CRONIN

REVISONS

REV DESCRIPTION BY DATE APP'D

B VIEWS SHOW LATEST REVISION DC 8/5/13

D NOTCH IS ADDED TO BACKSIDE DC 7/7/14

E UPDATED ALL VIEWS DC 6/19/15

RECOMMENDED STENCIL PATTERNSHADED AREA IS OPENING

RECOMMENDED PCB SOLDER PAD

PRIMARY ALTERNATIVE ALTERNATIVE

Recommended Stencil Pattern(Shaded Area Is Open)



CLD-AP75REV 6A 5

CASE TEMPERATURE (TS) MEASUREMENT POINT

XLamp MT-G2 and MK-R LED case temperature (Ts) should be measured on the PCB surface, as close to the LED’s thermal pad as

possible. This measurement point is shown in the pictures below.

MT-G2 MK-R

It is not required to use a solder footprint for the thermal pad that is larger than the XLamp MT-G2 or MK-R LED itself. In testing, Cree LED

has found such a solder pad to have insignificant impact on the resulting Ts measurement.

NOTES ON SOLDERING XLAMP® MT-G2 AND MK-R LEDS

XLamp MT-G2 and MK-R LEDs are designed to be reflow soldered to a PCB. Reflow soldering may be done by a reflow oven or by placing

the PCB on a hotplate and following the reflow soldering profile listed on the previous page.

Do not wave solder XLamp MT-G2 or MK-R LEDs. Do not hand solder XLamp MT-G2 or MK-R LEDs.

PCORRECT

PCORRECT

X WRONG



CLD-AP75REV 6A 6

Solder Paste TypeCree LED strongly recommends using “no clean” solder paste with XLamp MT-G2 or MK-R LEDs so that cleaning the PCB after reflow

soldering is not required. Cree LED uses Kester® R276 solder paste internally.

Cree LED recommends the following solder paste compositions: SnAgCu (tin/silver/copper) and SnAg (tin/silver).

Solder Paste ThicknessThe choice of solder and the application method will dictate the specific amount of solder. For the most consistent results, an automated

dispensing system or a solder stencil printer is recommended. Cree LED has seen positive results using solder thickness that results in a

4-mil (102-μm) bond line, i.e., the solder joint thickness after reflow soldering.

After SolderingAfter soldering, allow XLamp MT-G2 and MK-R LEDs to return to room temperature before subsequent handling. Premature handling of

the device, especially around the lens, could result in damage to the LED.

Cree LED recommends verifying the solder process by checking the consistency of the solder bond of several trial PCBs after reflow. After

shearing selected devices from the circuit board the solder should appear completely re-flowed (no solder grains evident). The solder

areas should show minimum evidence of voids on the backside of the package and the PCB.

Cleaning PCBs After SolderingCree LED recommends using “no clean” solder paste so that flux cleaning is not necessary after reflow soldering. If PCB cleaning is

necessary, Cree LED recommends the use of isopropyl alcohol (IPA).

Do not use ultrasonic cleaning.

PCORRECT

X WRONG

NOTES ON SOLDERING XLAMP® MT-G2 AND MK-R LEDS - CONTINUED

http://www.kester.com/products/product/R276-Solder-Paste/



CLD-AP75REV 6A 7

MOISTURE SENSITIVITY

Cree LED recommends keeping XLamp LEDs in the provided, resealable moisture-barrier packaging (MBP) until immediately prior to

soldering. Unopened MBPs that contain XLamp LEDs do not need special storage for moisture sensitivity.

Once the MBP is opened, XLamp MT-G2 and MK-R LEDs may be stored as MSL 1 per JEDEC J-STD-033, meaning they have unlimited floor

life in conditions of ≤ 30 ºC/85% relative humidity (RH). Regardless of storage condition, Cree LED recommends sealing any unsoldered

LEDs in the original MBP.

LOW TEMPERATURE OPERATION

The minimum operating temperature of these XLamp LED components is -40 °C. To maximize lifetime, Cree LED recommends avoiding

applications where the lamps are cycled on and off more than 10,000 cycles at temperatures below 0 °C.



CLD-AP75REV 6A 8

XLAMP® MT-G2 AND MK-R LED REFLOW SOLDERING CHARACTERISTICS

In testing, Cree LED has found XLamp MT-G2 and MK-R LEDs to be compatible with JEDEC J-STD-020C, using the parameters listed below.

As a general guideline, Cree LED recommends that users follow the recommended soldering profile provided by the manufacturer of the

solder paste used, and therefore it is the lamp or luminaire manufacturer’s responsibility to determine applicable soldering requirements.

Note that this general guideline may not apply to all PCB designs and configurations of reflow soldering equipment.

Profile Feature Lead-Free Solder

Average Ramp-Up Rate (Tsmax to Tp) 1.2 °C/second

Preheat: Temperature Min (Tsmin) 120 °C

Preheat: Temperature Max (Tsmax) 170 °C

Preheat: Time (tsmin to tsmax) 65-150 seconds

Time Maintained Above: Temperature (TL) 217 °C

Time Maintained Above: Time (tL) 45-90 seconds

Peak/Classification Temperature (Tp) 235 - 245 °C

Time Within 5 °C of Actual Peak Temperature (tp) 20-40 seconds

Ramp-Down Rate 1 - 6 °C/second

Time 25 °C to Peak Temperature 4 minutes max.

Note: All temperatures refer to topside of the package, measured on the package body surface.

IPC/JEDEC J-STD-020C

TP

TL

Tem

pera

ture

Timet 25˚C to Peak

Preheatts

tS

tP

25

Ramp-down

Ramp-up

Critical ZoneTL to TP

Tsmax

Tsmin



CLD-AP75REV 6A 9

CHEMICALS & CONFORMAL COATINGS

Below are representative lists of chemicals and materials to be used or avoided in LED manufacturing activities. For a complete and current

list of recommended chemicals, conformal coatings and harmful chemicals consult Cree LED’s Chemical Compatibility Application Note.

The video at www.youtube.com/watch?v=t24bf9D_1SA illustrates the process Cree LED has developed for testing the compatibility of

chemicals and materials with LEDs. You should also consult your regional Cree LED Field Applications Engineer.

Recommended ChemicalsIn testing, Cree LED has found the following chemicals to be safe to use with XLamp MT-G2 and MK-R Family LEDs.

• Water

• Isopropyl alcohol (IPA)

Chemicals Tested as HarmfulIn general, subject to the specifics in Cree LED’s Chemical Compatibility Application Note, Cree LED has found certain chemicals to be

harmful to XLamp MT-G2 and MK-R LEDs. Cree LED recommends not using these chemicals anywhere in an LED system containing

XLamp MT-G2 and MK-R LEDs. The fumes from even small amounts of the chemicals may damage the LEDs.

• Chemicals that might outgas aromatic hydrocarbons (e.g., toluene, benzene, xylene)

• Methyl acetate or ethyl acetate (i.e., nail polish remover)

• Cyanoacrylates (i.e., “Superglue”)

• Glycol ethers (including Radio Shack® Precision Electronics Cleaner - dipropylene glycol monomethyl ether)

• Formaldehyde or butadiene (including Ashland® PLIOBOND® adhesive)

Hermetically Sealing LuminairesFor proper LED operation and to avoid potential lumen depreciation and/or color shift, LEDs of all types must operate in an environment

that contains oxygen. Simply allowing the LEDs to ventilate to air is sufficient; no extraordinary measures are required. Hermetically

sealing LEDs in an enclosed space is not recommended.

https://cree-led.com/media/documents/XLamp_Chemical_Comp.pdf

http://www.youtube.com/watch?v=t24bf9D_1SA

https://cree-led.com/media/documents/XLamp_Chemical_Comp.pdf



CLD-AP75REV 6A 10

ASSEMBLY STORAGE & HANDLING

Do not stack PCBs or assemblies containing XLamp MT-G2 or MK-R LEDs so that anything rests on the LED lens. Force applied to the LED

lens may result in the lens being damaged or displaced. PCBs or assemblies containing XLamp MT-G2 or MK-R LEDs should be stacked

in a way to allow at least 1 cm clearance above the LED lens.

Do not use bubble wrap directly on top of XLamp MT-G2 and MK-R LEDs. Force from the bubble wrap can potentially damage the LED.

PCORRECT

XWRONG

PCORRECT



CLD-AP75REV 6A 11

TAPE AND REEL

All Cree LED carrier tapes conform to EIA-481D, Automated Component Handling Systems Standard.

All dimensions in mm.

MT-G2 Carrier Tape

MK-R Carrier Tape

SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

X° ± .5 °.XXX ± .25.XX ± .75.X ± 1.5


.XX ± .25

.XXX ± .125X° ± .5 °



SURFACE FINISH: 1.6

Trailer160mm (min) of

empty pocketssealed with tape

(15 pockets min.)

Loaded Pockets(500 Lamps)

12±.15.25

16+.3-.0

1.75±.10

4±.10

Leader400mm (min) of


(35 pockets min.)

9.4

1/13.000

B2402-00016

MTG LOADING SPEC

--

--

----

----

1/28/11D. CRONIN

REVISONS


A Initial Release DC 1/28/11

B Added missing sprocket holes DDS 10/17/11

END START

User Feed Direction

CATHODE SIDE

ANODE SIDE

1.5± .1

SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

X° ± .5 °.XXX ± .25.XX ± .75.X ± 1.5


.XX ± .25

.XXX ± .125X° ± .5 °



SURFACE FINISH: 1.6



(15 pockets min.)


12±.15.25

16+.3-.0

1.75±.10

4±.10



(35 pockets min.)

9.4

1/13.000

B2402-00016

MTG LOADING SPEC

--

--

----

----

1/28/11D. CRONIN

REVISONS



B Added missing sprocket holes DDS 10/17/11

END START

User Feed Direction

CATHODE SIDE

ANODE SIDE

1.5± .1

SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

X° ± .5 °.XXX ± .25.XX ± .75.X ± 1.5


.XX ± .25

.XXX ± .125X° ± .5 °



SURFACE FINISH: 1.6



(15 pockets min.)


12±.14.31

16+.3-.0

1.75±.104±.10



(35 pockets min.)

7.4

0.36

"13

13mm

1/13.000

A2402-00025

MKR LOADING SPEC

--

--

----

----

12/7/12D. CRONIN

REVISONS



END START

User Feed Direction

CATHODE SIDE

ANODE SIDE

User Feed Direction

1.5± .1

SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


X° ± .5 °.XXX ± .010.XX ± .03.X ± .06


.XX ± .01

.XXX ± .005X° ± .5 °

UNLESS OTHERWISE SPECIFIEDDIMENSIONS ARE IN INCHES

AND AFTER FINISH.TOLERANCE UNLESS SPECIFIED:

SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558


UNAUTHORIZED PERSON WITHOUT THE WRITTEN CONSENTMAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANYCONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOTCONTANED WITHIN ARE THE PROPRIETARY ANDCREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION

OF CREE INC.

NOTICE

SURFACE FINISH: 63

330+.25-.75

12.4+1.0-.5MEASURED AT EDGE

16.4+0.2.0MEASURED AT HUB

12.4+.2

.0MEASURED AT HUB

±.213.1

1.9±.4

±.421

60° 60°

1/10.500

A2400-00009

REEL, 13" X 12MM, 3 PIECE SNAP

-

ANTI-STATIC HIPS

----

----

09/29/09D. CRONIN

2400-00009INDEX QTY ITEM COMMENTS

1 1 2400-00009-CORE2 2 2400-00009-REEL

REVISONS


SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


X° ± .5 °.XXX ± .010.XX ± .03.X ± .06


.XX ± .01

.XXX ± .005X° ± .5 °



SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

SURFACE FINISH: 63

330+.25-.75



12.4+.2

.0MEASURED AT HUB

±.213.1

1.9±.4

±.421

60° 60°

1/10.500

A2400-00009


-

ANTI-STATIC HIPS

----

----

09/29/09D. CRONIN


1 1 2400-00009-CORE2 2 2400-00009-REEL

REVISONS


SIZE

TITLE

OF

REV.

SHEET

CDRAWING NO.

DATE

DATE

DATE

CHECK


MATERIAL

APPROVED

DRAWN BY


X° ± .5 °.XXX ± .010.XX ± .03.X ± .06


.XX ± .01

.XXX ± .005X° ± .5 °



SCALE

A

B

C

D

123456

6 5 4 3 2 1

A

B

C

D

Phone (919) 313-5300Fax (919) 313-5558



OF CREE INC.

NOTICE

SURFACE FINISH: 63

330+.25-.75



12.4+.2

.0MEASURED AT HUB

±.213.1

1.9±.4

±.421

60° 60°

1/10.500

A2400-00009


-

ANTI-STATIC HIPS

----

----

09/29/09D. CRONIN


1 1 2400-00009-CORE2 2 2400-00009-REEL

REVISONS




CLD-AP75REV 6A 12

PACKAGING & LABELS

The diagrams below show the packaging and labels Cree LED uses to ship XLamp MT-G2 and MK-R LEDs. XLamp MT-G2 and MK-R LEDs

are shipped in tape loaded on a reel. Each box contains only one reel in a moisture barrier bag.

Label with Cree Bin Code, Qty, Lot #

Label with Cree Bin Code, Qty, Lot #

Vacuum-Sealed Moisture Barrier Bag

Dessicant (inside bag)

Humidity Indicator Card (inside bag)

Patent Label

Label with Customer Order Code, Qty, Reel ID, PO #

Patent Label

Label with Cree Bin Code, Quantity, Reel ID


Label with Cree Order Code, Quantity, Reel ID, PO #

Label with Cree Order Code, Quantity, Reel ID, PO #


Unpackaged Reel

Packaged Reel

Boxed Reel

xlamp mt-g2 and mk-r leds - cree led

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