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Old 28th April 2011, 02:19 PM   #11
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If I can't get the samples, I'll buy that. I only need like 2 square inches.
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Old 28th April 2011, 05:53 PM   #12
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That ebay mica doesn't look thermal washer grade. For this duty you need very thin sheets, flat, and void-free. Mica washers for heat sinking should be glass-clear with no "bubbles" in it. Cutting that with scissors is bound to leave broken up edges, so would need to be cut a bit larger than the device/sink seating area. Heat sink washers are normally made from the highest quality mica sheet and likely punched on a very sharp die.

Even if you have to use a couple pieces made for TO3P, you'd probably be further ahead than trying to make your own from this ebay stuff.

It does look like just the material used in building a vacuum tube, not that anyone we know is going to.

Last edited by Andrew Eckhardt; 28th April 2011 at 05:59 PM.
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Old 29th April 2011, 05:58 PM   #13
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I used this for my LM4780: THERMAL PAD SIP .006" K10 - SPK10-0.006-00-105

It's a bit too large but completely covers the back of an LM4780. You can cut it to size or just leave the extra like I did.
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Old 29th April 2011, 06:05 PM   #14
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Quote:
Originally Posted by Redshift187 View Post
I used this for my LM4780: THERMAL PAD SIP .006" K10 - SPK10-0.006-00-105

It's a bit too large but completely covers the back of an LM4780. You can cut it to size or just leave the extra like I did.

I think that's double thickness, where less is better given good flatness of the interface and electrical "isolation" of the kapton backing is maintained.
the measured thermal resistance is surely higher on this one.
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Old 29th April 2011, 07:39 PM   #15
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Quote:
Originally Posted by Redshift187 View Post
I used this for my LM4780: THERMAL PAD SIP .006" K10 - SPK10-0.006-00-105

It's a bit too large but completely covers the back of an LM4780. You can cut it to size or just leave the extra like I did.
I swear I looked on Digikey and all I saw was TO-3 packages. And good thing I just got a package from them in the mail today with some other things...great timing! *sarcasm*

Alright, Digikey only charges like $2 so ship so that looks good. Thanks! I'm thinking I might use some thermal epoxy actually, since I'm using these computer heatsinks with heatpipes that I can't exactly drill into...The ones I saw were non electrically conductive, so I could possibly just use that...provided I filled in all the nooks and crannies.
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Old 29th April 2011, 08:27 PM   #16
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Originally Posted by TheLaw117 View Post
I swear I looked on Digikey and all I saw was TO-3 packages. And good thing I just got a package from them in the mail today with some other things...great timing! *sarcasm*
err.. did you skip post #8 ?
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Old 30th April 2011, 02:52 AM   #17
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Yes apparently...
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