Isolation pads

Devil_H@ck · 6th January 2004, 04:52 PM

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?

Jan Dupont · 6th January 2004, 08:32 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, 09:11 PM

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

Devil_H@ck · 6th January 2004, 09:47 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, 01:00 AM

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

Thank you in advance

Trigon.

azira · 7th January 2004, 03:27 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, 03:33 AM

These are the ones that I have been asking for. They are used with mounting screws.

Trigon

Peter Daniel · 7th January 2004, 04:18 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, 04:39 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, 05:25 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!

6th January 2004, 04:52 PM	#1
Devil_H@ck diyAudio Member Join Date: Dec 2003 Location: Belgium	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?

6th January 2004, 08:32 PM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	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.... __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

7th January 2004, 04:18 AM	#8
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	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 __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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6th January 2004, 09:11 PM	#3
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	I beleive you are referring to "sil-pad"......and I would still use compound

6th January 2004, 09:47 PM	#4
Devil_H@ck diyAudio Member Join Date: Dec 2003 Location: Belgium	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.

7th January 2004, 01:00 AM	#5
trigon diyAudio Member Join Date: May 2002 Location: Canada	Where I can get silicon vashers for TO-220. ? Thank you in advance Trigon.

7th January 2004, 03:27 AM	#6
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	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?

7th January 2004, 04:39 AM	#9
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	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

7th January 2004, 05:25 PM	#10
Devil_H@ck diyAudio Member Join Date: Dec 2003 Location: Belgium	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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