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Old 16th October 2006, 08:19 PM   #1
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Default Silicone VS mica pads - pros/cons?

I traditionally use mica pads, but more and more I see silicone pads under transistors. What are resulting thermal resistances, if to compare?
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Old 16th October 2006, 08:44 PM   #2
Netlist is offline Netlist  Belgium
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Here's an interesting thread about the subject.

/Hugo
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Old 16th October 2006, 09:54 PM   #3
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Quote:
Originally posted by Netlist
Here's an interesting thread about the subject.

/Hugo
Thanks Hugo, great topic!!!
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Old 22nd October 2006, 04:18 PM   #4
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Has anyone ever used beryllium oxide isolators ? Beryllium oxide is carcinogenic and poses health risks if inhaled. I know it is used in traveling wave tubes TWT's for rapid heat transfer to cold plates in Hi-power RF amplifiers( mil-aircraft). Any thoughts ?
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Old 22nd October 2006, 04:37 PM   #5
EUVL is offline EUVL  Europe
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Beryllia is great stuff, even better than Aluminium Nitride. If you know a source to get thin substrates at affordable prices, please let us know.

But then diamond is even better, isn't it ?

Patrick
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Old 22nd October 2006, 05:55 PM   #6
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Quote:
Originally posted by XEAGLEKEEPER
Has anyone ever used beryllium oxide isolators ? Beryllium oxide is carcinogenic and poses health risks if inhaled. I know it is used in traveling wave tubes TWT's for rapid heat transfer to cold plates in Hi-power RF amplifiers( mil-aircraft). Any thoughts ?
I used berillium ceramic for hybrid ICs. Also, long time ago I had mil spec TO-3 pads made of berillium ceramic. But I don't remember details.

Why I started the thread, silicone pads look attractive, and I wandered, what if to use them instead of mica pads.
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Old 22nd October 2006, 06:19 PM   #7
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Hi all

see my note on the Pass Labs thread, mentioned "here" by Hugo.

John
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Old 22nd October 2006, 07:39 PM   #8
AndrewT is offline AndrewT  Scotland
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Hi Wave,
they are not silicone pads.

Try using some other names in your searching.
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Old 22nd October 2006, 08:13 PM   #9
Stocker is offline Stocker  United States
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Quote:
Originally posted by EUVL

But then diamond is even better, isn't it ?

Patrick

hey can I borrow your CVD chamber to lay a coat of diamond on my anodized heatsink?
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Old 22nd October 2006, 10:04 PM   #10
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Bergquist make kapton and also Boron nitride loaded silicon pre-cut transistor insulators.

5-6x the thermal conductivity of the gray rubbery pads, but about the same increase in cost.

Still, FAR cleaner than any of the thermal goops.
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