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-   -   Isolation pads (http://www.diyaudio.com/forums/parts/25490-isolation-pads.html)

Devil_H@ck 6th January 2004 05:52 PM

Isolation pads
 
I have some isolation pads here for TO-3 and TO-220 cases.
These are those "new" synthetic (so not mica) pads. Do I need to apply thermal compound or not? I have some Arctic Silver 3 lying around.

I think these are the isolation pads I've got: http://www.aavidthermalloy.com/produ...ds.shtml#insil
In case you don't know what the Arctic Silver 3 is: http://www.arcticsilver.com/as3.htm (this is supposed to be one of the best thermal compounds available for CPUs) (Thermal resistance: <0.005°C-in²/Watt :D)

Oh, btw, do I have to use the isolation pads on BD139 & BD140? I suppose I have to, since there's iron on the back of it, right?

Jan Dupont 6th January 2004 09:32 PM

These are silicone pads mentioned to use without compound, however some compound never will do no damage ;)

And YES!!! All transistors with some metal in the housing MUST be fitted with insulation pads....;)

JOE DIRT® 6th January 2004 10:11 PM

I beleive you are referring to "sil-pad"......and I would still use compound

Devil_H@ck 6th January 2004 10:47 PM

Ok, thanks!
I guess I'll have to loosen the screws and apply a bit of compound to both sides of the isolation pads.

Work for tomorrow, time to go to bed now.

trigon 7th January 2004 02:00 AM

Where I can get silicon vashers for TO-220. ?:)

Thank you in advance

Trigon.

azira 7th January 2004 04:27 AM

Are you talking about the little rubber looking pads? I saw some of those when I was getting some Mica wafers for my transistors at the surplus store. I also saw some thicker opaque white ones for my transistors that were stuck to a plastic backing. You were supposed to peel them off, what are those?

trigon 7th January 2004 04:33 AM

2 Attachment(s)
These are the ones that I have been asking for. They are used with mounting screws.

Trigon

Peter Daniel 7th January 2004 05:18 AM

Digi-Key certainly carry those as well the Chinese store Downtown;)

PS: I don't think it's recommended to use thermal grease on sil-pads

JOE DIRT® 7th January 2004 05:39 AM

Peter they don`t reccomend thermal grease on Sil-Pad but through extensive testing we found it to be better.....the problem is that people tend to use exorberate amounts which degrades thermal transfer

Devil_H@ck 7th January 2004 06:25 PM

Ah, well, I certainly wouldn't apply lots of it. I put a plastic bag around my finger and rub it on top of the area where it needs to go. Very thin layers guaranteed!


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