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Old 6th January 2004, 04:52 PM   #1
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Default 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 )

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?
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Old 6th January 2004, 08:32 PM   #2
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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....
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Old 6th January 2004, 09:11 PM   #3
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I beleive you are referring to "sil-pad"......and I would still use compound
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Old 6th January 2004, 09:47 PM   #4
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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.
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Old 7th January 2004, 01:00 AM   #5
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Where I can get silicon vashers for TO-220. ?

Thank you in advance

Trigon.
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Old 7th January 2004, 03:27 AM   #6
azira is offline azira  United States
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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?
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Old 7th January 2004, 03:33 AM   #7
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These are the ones that I have been asking for. They are used with mounting screws.

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Old 7th January 2004, 04:18 AM   #8
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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
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Old 7th January 2004, 04:39 AM   #9
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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
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Old 7th January 2004, 05:25 PM   #10
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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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