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Old 15th July 2005, 04:55 PM   #1
DonoMan is offline DonoMan  United States
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Default 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
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Old 15th July 2005, 05:05 PM   #2
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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
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Old 15th July 2005, 06:02 PM   #3
DonoMan is offline DonoMan  United States
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ok, I'll try that, thanks
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Old 15th July 2005, 07:53 PM   #4
bocka is offline bocka  Germany
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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.
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Old 15th July 2005, 07:59 PM   #5
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Bocka,

you're absolutely right. The pads I got were k10's and there kapton (and not silicon): thermal resistanse 0,2C/W
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Old 15th July 2005, 11:26 PM   #6
DonoMan is offline DonoMan  United States
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can you give me like a digikey/mouser part no.?
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Old 16th July 2005, 07:51 AM   #7
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BER120-ND
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Old 16th July 2005, 08:50 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
someone recently posted a link to WWW.kaptontape.com
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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