CPU Adhesive tape vs Silipad - diyAudio
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Old 6th November 2002, 07:51 PM   #1
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Default CPU Adhesive tape vs Silipad

Folks:

After a frustrating hour in Fry's, I can not find extra Silipad insulators for my TO-3p mosfet's.

I did find some "CPU Thermal tape" which is for sticking a CPU to a heat sink. There's no grounding issues there, so I don't know if this will inslulate or not. It will be a mounting method (no bolts) as well as good thermal condutivity.

Do you think I can use the CPU tape for my amp?
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Old 6th November 2002, 08:16 PM   #2
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What's TO-3p? Is it the same as TO-3? I've got a lot of these pads.
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Old 6th November 2002, 08:22 PM   #3
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isnt TO3p = TO3 plastic synonym TO-247 ? i thought so.
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Old 6th November 2002, 09:51 PM   #4
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Default TO3

Hi,

Silverloaded thermal paste works fine too.

And I do believe the P stands for Plastic Casing.

Cheers,
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Old 7th November 2002, 12:48 AM   #5
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Default Thermal resistance vs voltage rating

Watch the thermal resistance on some of those silpad type materials. The ones with a high voltage rating (often used for SMPS's etc) have pretty ordinary thermal performance. Also, the thinner the pad/tape is, the flatter your surfaces have to be.

I think TO3-P is like TO-247 but with a bit of the metal tab exposed around the top edge, also the mounting hole is not insulated like in the '47.

GP.
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Old 7th November 2002, 01:26 AM   #6
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Right, like a TO-247; here's a picture:

Exicon 10N20

The non insulated is the big issue, it HAS to be isolated from the heat sink, or I'll be frying bacon instead of listning to music!

I don't see how thermal paste will help do that.

Where can I get some Silipad's? I couldn't find any at Mouser
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Old 7th November 2002, 04:19 AM   #7
Jean is offline Jean  United States
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Digikey has to3p pads. BER178-ND
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Old 7th November 2002, 04:22 AM   #8
sangram is offline sangram  India
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'CPU thermal tape' does not insulate.
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Old 7th November 2002, 05:09 AM   #9
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Well, it's off to DigiKey then!

UPS is getting 1/2 of my project cost, one minimum charge at a time lol

Thanks folks, this forum is great.
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Old 7th November 2002, 05:17 AM   #10
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S/H from Digikey is cheap, order some extra components to make up for that minimum order fee.
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