GORETM

High Temperature Capacitors

Benefits of GORE™ Capacitors

• Increased tool reliability and reduced risk of unexpected failure

• Stable and predictable capacitance

• Withstand high temperatures and voltage spikes

• Withstand voltages up to 600 VDC and 200°C with minimal de-rating

• Withstand shock and vibration

• Reduce system design complexity and improve installation

Increase tool reliabilityGORE™ High Temperature Capacitors reduce the risk of tool failure by delivering stable performance for an extended term in demanding downhole environments. Unlike traditional capacitors, Gore technology avoids sudden and complete failure for a more predictable mission completion.

With minimal de-rating, GORE™ Capacitors delivers higher voltage and capacitance at elevated temperature so that designs requiring large numbers of capacitors are no longer a burden— simplifying electronic system design, reducing failure points, and facilitating easier assembly.

Industry ChallengePower electronics in downhole tools are subjected to some of the harshest operating conditions on the planet. Design teams have had to work around the challenges of legacy capacitor technologies: using multiple capacitors to meet power needs while overcoming de-rating, innovating specialty mounting techniques for shock & vibration, the use of dewar insulation systems, or even cooling systems to resist extreme temperatures. But despite the number of incremental improvements, the critical weakness is hidden in the failure mode of traditional capacitor choices. For when they fail, they fail short leading to risk of downhole tool failure.

GORE™ Capacitor Summary

Capacitance Range 1–100 μF (single element design)

Temperature Rating -55–200°C (-67 - 392°F)

Voltage Rating 600 VDC (with excursion to 750)

Typical ESR 20 –30 mV (50 μf @ 2 kHz)

Typical ESL < 40 nH

Insulation Resistance Terminal-to-Terminal

> 100,000 MV x μF

Withstand Voltage Terminal-to-Case

1500 VDC

Environmental Compliance RoHS

200°C Film Capacitors for Oil & Gas Power Electronics

Time at Elevated Temperature

Capa

cita

nce

(%)

100

80

60

40

20

0

GORE™ Capacitors Stable for Extended TermTraditional Capacitors Fail Short

GORETM Capacitor

Minimum Design Capacitance

Ceramics/Wet Tantalum Capacitor

Predictable, Slow Decay

Catastrophic Failure

GORETM Capacitor

Minimum Design Capacitance

Time (hours)Ca

paci

tanc

e (%

)

100

80

60

40

20

0

Endurance Testing of GORE™ Capacitors (600 VDC at 200˚C)

100 500 1000 1500

Temperature (˚C)

∆C/C

0 (%)

40

30

20

10

0

-10

-20

-30

-60 -40 -20 0 20 40

-40

60 80 100 120 140

-50

Capacitance Stability Across Temperature

160 180 200

GORETM Capacitor

X7R Ceramics Capacitor

Wet Tantalum Capacitor

Stable and Reliable Capacitance for Extended TermTraditional capacitors used in oil and gas downhole equipment do not typically survive in harsh well conditions for long periods. Ceramic capacitors become brittle in high temperatures over time that can lead to a short failure, particularly when exposed to shock and vibration. Other technologies, such as wet tantalum can fail short as a result of transient voltages. However, GORE™ Capacitors deliver stable and reliable capacitance over extended periods despite these challenging environments.

Endurance testing of 111 GORE™ Capacitors at the maximum operational ratings (200°C and 600 VDC) indicates 90% probability of capacitance performance.

When considering an electronic system design that requires a minimum 80% starting capacitance to operate with stability, at least 95 percent of GORE™ Capacitors will pass at 1000 hours and at least 91 percent at 1500 hours (95% confidence levels). Note: For actual operating conditions below the maximum ratings, expectations of capacitor longevity can be substantially extended.

Simplified Design and Installation with Minimal De-rating To meet the need for high capacitance/high voltage in high temperature conditions, traditional capacitors require substantial de-rating. Therefore, design engineers are often required to use large quantities of small capacitors resulting in a complex system design, a large number of potential failure points and increased installation costs. Alternatively, a single GORE™ Capacitor offers a large amount of stable capacitance with minimal de-rating under high temperature and voltage conditions.

% R

T Ra

ted

Volt

age

100

80

60

40

20

0

Category Voltage at Temperature (175-200˚C)

GORETM Capacitor X7R Ceramics Capacitor Wet Tantalum Capacitor

GORETM

High Temperature Capacitors

200°C Film Capacitors for Oil & Gas Power Electronics

Additional Qualification Testing for GORE™ Capacitors

Examination or Test Specification or Examination/Test Conditions Status

Insulation Resistance (DWV) MIL-STD 202G Method 301 (1200 VDC) Pass

Thermal Cycling MIL-STD 883J, Modified Condition D (-55°C–200°C) Pass

Mechanical Shock MIL-STD 202G, Method 213, Test Condition I20–30 Pass

Vibration MIL-STD 202G, Method 204D, Test Condition D (20 g Peak) Pass

Lead Pull MIL-STD 202G, Method 211A, Test Condition A (5 lbf) Pass

Temperature (˚C)

Insu

latio

n Re

sist

ance

(MΩ

x µ

F)

1e+9

1e+8

1e+7

1e+6

1e+5

1e+4

1e+3

1e+2

-75 -50 -25 0 25 50

1e+1

75 100 125 150 175

1e+0

Insulation Resistance Over Temperature

200 225

GORETM Capacitor

GORETM Post Thermal Cycle

Typical Equivalent Series Resistance (ESR)

Capacitor Size (μF)

Typical ESR @ 10 kHz (mV)

1 20 –50

10 15 –25

33 25 –35

50 20 –30

Capacitor dimensions shown next page.

Pass = No visual inspection or electrical failures (eg., capacitance and ESR) observed.

Additional test data available upon request.

1 µF Capacitor (Resonant Freq = 650 kHz)

10 µF Capacitor (Resonant Freq = 300 kHz)

50 µF Capacitor (Resonant Freq = 110 kHz)

Frequency (Hz)Im

peda

nce

(�)

10

1

0.1

0.01

Impedance vs. Frequency

10K 100K 2M

0.001

1M

LOD

W. L. Gore & Associates

gore.com

NOTICE — USE RESTRICTIONS APPLYNot for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations.

GORE and designs are trademarks of W. L. Gore & Associates ©2017 W. L. Gore & Associates, Inc. NBD-0280-DAT-UK-JAN17

Example DimensionsFor rated use to 200°C / 600 VDC, the following table offers dimensional guidance on standard configurations of GORE™ Capacitors. Note: Custom configurations are possible, to include smaller sizes for lower power needs 300 VDC. Please contact Gore to discuss your specific application requirements.

Standard Sizes for GORE™ Capacitors

Capacitance (µF)

Outer Diameter (mm)

Overall Length (mm)

1 17 41

5 24 51

10 32 51

33 39 100

50 47 95

100 64 95

Contact Gore for more information

GORE™ Capacitors W. L. Gore & Associates, Inc. 555 Paper Mill Road Newark, DE 19711 Toll free in the US: +1 800 523 4673 Outside US: +1 410 506 7812 capacitors@wlgore.com

Other configurations are possible.

GORETM

High Temperature Capacitors