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Old 8th January 2017, 12:02 AM   #1
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Default Currently available TO-264 insulators?

I am planning an amp build using a pair of TO-264 devices on the output of each channel, but am having trouble finding a matching thermal pad which is not electrically conductive. Datasheets for Bergquist suggest there should be Sil-Pads of appropriate size, but I cannot seem to find them in-stock at my usual suppliers (Arrow, Mouser). It looks like the DIY Audio Store's Keratherm pads will work, but the price is rather steep.

Does anyone know of thermal pads of sufficient size and affordable price? Is it possible to make these work with careful orientation?
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Old 8th January 2017, 12:19 AM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by needtubes View Post
Is it possible to make these work with careful orientation?
Yes, those should work with the right positioning, and are made for a TO-247, which is fairly similar to TO-264.
SP900S-0.009-00-104 Bergquist | Fans, Thermal Management | DigiKey

Last edited by rayma; 8th January 2017 at 12:34 AM.
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Old 8th January 2017, 02:12 AM   #3
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Ok, great. Is the 900S you linked preferred over the K10?
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Old 8th January 2017, 02:39 AM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by needtubes View Post
Is the 900S you linked preferred over the K10?
The 900S has 1.6C/W, while the K10 has 1.3C/W. Either should be ok,
but if there is high dissipation, use the K10. The 900S is thicker also.
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Old 11th January 2017, 05:14 AM   #5
wg_ski is offline wg_ski  United States
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You can get Bergquist Sil-pad material by the sheet. About a foot square in the $55 range. That will make a lot of TO264s. The largest TO247s are almost big enough, but not quite if you're concerned about creepage distances. They would be ok on 40 or 50 volt rails, but when you push 200+, it would be iffy.
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Old 11th January 2017, 05:39 PM   #6
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I'll use less than 30V rails, so am not too concerned about electrical leakage. The thicker 900S may be a good idea, though, if the pads don't entirely cover the metal backing. That would give a little extra buffer space.

I have considered buying a full sheet, and may end up doing that before its over...
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Old 12th January 2017, 01:27 AM   #7
wg_ski is offline wg_ski  United States
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They do cover the entire metal base. But they do not quite make the entire plastic package outline. With careful alignment and relatively low voltage they can be used. If you are doing banks of 247s or 264s closely spaced it's far easier to cut a single strip from a full sheet.
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