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Old 21st December 2011, 02:20 PM   #1
nrg2009 is offline nrg2009  United States
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Default double sided thermal tape?

Hi,

Does anyone have experience with double sided thermal tape for mounting mosfets to a heatsink?
I found this product and not being an expert it looked promissing to me: "Ther-A-Gripô 1050"

My project is a class A mosfet amplifier.

Thanks for any help.
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Old 22nd December 2011, 05:01 PM   #2
nrg2009 is offline nrg2009  United States
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The mosfets I'm using are IRFP244, for a Aleph2 clone. Any contributors for this topic?
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Old 22nd December 2011, 05:14 PM   #3
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If you can avoid thermal washers and use a separate heat sink per device it is by far better. Any insulating device will de-rate the thermal conductivity between device and heat sink.
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Old 22nd December 2011, 05:47 PM   #4
RJM1 is offline RJM1  United States
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I'd be worried about the logn term adhesive properties and resistance to vibration.
From the pdf.

Ther-A-Grip 1050 and 1070, when you need to attach a heat sink to an electrical package, consider Ther-A-Grip doublesided
tape.Ther-A-Grip 1050 uses a thin, Kapton MT-filled, polydimide film coated on both sides with pressure-sensitive, acrylic
adhesive loaded with aluminum oxide for good thermal performance and excellent electrical isolation.Ther-A-Grip 1070 consists
of a thin aluminum foil coated with aluminum oxide-filled, acrylic adhesive for electrical conductivity and enhanced thermal
conductivity.

http://www.chiptech.com/secondary/ma...df/A/AAVID.pdf
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Old 22nd December 2011, 05:56 PM   #5
nrg2009 is offline nrg2009  United States
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I got a sample of the 1050 tape. It is very very thin, but supposedly electrically non-conductive. What are your thoughts on the thermal properties?

Thanks
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Old 22nd December 2011, 07:43 PM   #6
RJM1 is offline RJM1  United States
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From the data sheet it looks good. But I wonder about it's long term stability.
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Old 14th February 2012, 01:59 AM   #7
nrg2009 is offline nrg2009  United States
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Wow this Aavid Ther A Grip 1050 is very strong. I did a little test run with one device. It is tough to pull off after i stuck it on. I cleaned both surfaces with an alcohol wipe prior to sticking it on anodized aluminum.

Im going to use it on my Aleph 2 project, im convinced it will hold the driver boards.
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Old 14th February 2012, 04:50 AM   #8
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Quote:
Originally Posted by Nico Ras View Post
If you can avoid thermal washers and use a separate heat sink per device it is by far better. Any insulating device will de-rate the thermal conductivity between device and heat sink.
I know for a fact that separate heatsinks with bipolar transistors in parallel is a BAD idea as it assures thermal runaway. Are MOSFETs immune from this problem?

G≤
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Old 14th February 2012, 10:49 AM   #9
AndrewT is offline AndrewT  Scotland
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1050 and clamp bars will be more reliable in the very long term.
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Old 14th February 2012, 12:45 PM   #10
nrg2009 is offline nrg2009  United States
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Andrew, I appreciate your feedback, I agree. I will work on some clamp bars.
I would hate to have the amp fail because the mosfets got disconnected from the heatsink.
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