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DonoMan 15th July 2005 05:55 PM

cheapest source of heatsink/thermal pads?
What's the cheapest source for non-electrically-conductive thermal pads? I found some on Ebay, but they seem to be more expensive than the ones I found on Digikey, but I might not be searching by the best terms.

Edit: the ones from Digikey I was looking at are PN BER179-ND

rwagter 15th July 2005 06:05 PM

Try get some from berquist themselfs, I just send 1 email to the distributor and ended op getting 12 nice silicon based thermal pads for to-247 for free :)

DonoMan 15th July 2005 07:02 PM

ok, I'll try that, thanks

bocka 15th July 2005 08:53 PM

Any silicone thermal pad sucks. I've just measured some in TO-220 housing. Regardless which I've used (Bergquist, Fischer and some other) they have a thermal resistance of 2K/W and more.

When I changed to the good old micas and using thermal grease I could simply obtain half of the thermal resistance. In other words: When using micas you can use a smaller heatsink.

rwagter 15th July 2005 08:59 PM


you're absolutely right. The pads I got were k10's and there kapton (and not silicon): thermal resistanse 0,2C/W

DonoMan 16th July 2005 12:26 AM

can you give me like a digikey/mouser part no.?

rwagter 16th July 2005 08:51 AM


AndrewT 16th July 2005 09:50 AM

someone recently posted a link to
They supply adhesive backed 1mil and 2mil by 0.75inch wide Kapton tape. Only $10 & $14 for 36yds. That's about 1 cent per To264.

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