I found these at DigiKey:
Note that they are an insulating pad which it sounds like what you
originally found. For boards that connect to the transistor case via a pad
on the board, you would need a conductive pad. I have no financial
connection to DigiKey other than being a customer. They do sell in small
quantities.
I think that DigiKey also sells the Bergquist-Henkel (I searched under
Bergquist) versions of these, both the insulating and conductive ones, but
it's hard to find them without a product number.
If the transistor is not in a TO-3 case, if you can figure out the case
type, search "heat sink pad XXX transistor case" and you will likely find
links to products.
Steve H
On Thu, Jul 2, 2020 at 12:20 PM Greg Muir via groups.io <big_sky_explorer=
[email protected]> wrote:
Bergquist (now Henkel/Bergquist) manufactures an array of thermal
management products. One of these, ¡°Silpads¡± is a product I have been
using for replacement purposes. It is a flexible, rubbery material that
many OEM manufacturers use instead of mica.
The neat thing about this product is that you don¡¯t need to apply any
thermal compound. And it can be purchased from many distributors in the
common shapes for transistor heatsinking, etc.
As for your application, you might try contacting the manufacturer to see
if you might be able to obtain a small sample of a sheet to cut up and fit
in the unit.
Greg
