double sided thermal tape?

nrg2009 · 21st December 2011, 02:20 PM

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-Grip™ 1050"

My project is a class A mosfet amplifier.

Thanks for any help.

nrg2009 · 22nd December 2011, 05:01 PM

The mosfets I'm using are IRFP244, for a Aleph2 clone. Any contributors for this topic?

Nico Ras · 22nd December 2011, 05:14 PM

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.

RJM1 · 22nd December 2011, 05:47 PM

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

nrg2009 · 22nd December 2011, 05:56 PM

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

RJM1 · 22nd December 2011, 07:43 PM

From the data sheet it looks good. But I wonder about it's long term stability.

nrg2009 · 14th February 2012, 01:59 AM

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.

stratus46 · 14th February 2012, 04:50 AM

Quote:

Originally Posted by Nico Ras

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?

G²

AndrewT · 14th February 2012, 10:49 AM

1050 and clamp bars will be more reliable in the very long term.

nrg2009 · 14th February 2012, 12:45 PM

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.

21st December 2011, 02:20 PM	#1
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	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-Grip™ 1050" My project is a class A mosfet amplifier. Thanks for any help.

22nd December 2011, 05:14 PM	#3
Nico Ras diyAudio Member Join Date: Nov 2005 Location: Amanzimtoti - East Coast of South Africa	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. __________________ Kind regards Nico

14th February 2012, 10:49 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	1050 and clamp bars will be more reliable in the very long term. __________________ regards Andrew T.

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22nd December 2011, 05:01 PM	#2
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	The mosfets I'm using are IRFP244, for a Aleph2 clone. Any contributors for this topic?

22nd December 2011, 05:47 PM	#4
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	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

22nd December 2011, 05:56 PM	#5
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	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

22nd December 2011, 07:43 PM	#6
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	From the data sheet it looks good. But I wonder about it's long term stability.

14th February 2012, 01:59 AM	#7
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	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.

14th February 2012, 12:45 PM	#10
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	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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