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Old 25th November 2020, 07:02 AM   #1
rhempz01 is offline rhempz01  United States
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Join Date: Nov 2016
Location: Milford Delaware
Default Mosfet Reasonaleb b b ⁶p1 Thermal Transfer Solutions.

A few question about replacing the silicone tacky type. It always tears when attempting to removebit from the old transistors or mosfets. Where can this be purchased or should i just stick to mica or kapton tape?
I only have 100 to-247 mica insulators.
And 1 and 2mil kapton is this thick enough or do i need the expensive 5mil kapton tape?
Can the other silicon type tape be purchaed? If so where?
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Old 25th November 2020, 07:13 AM   #2
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
The thicker the tape, the poorer the thermal transfer. 1mil kapton is good for more than 1000v.

The type of Kapton also matters. The stuff that's clear/amber is HN and isn't as conductive as MT (not transparent). The MT is much more expensive.

The other types of tape are harder to find in small quantities and are generally very expensive.

For harder insulators like kapton or mica, it's absolutely critical that you get the transistors aligned perfectly with the face of the heatsink. That's why I recommend using jigs to hold the FETs in alignment when soldering them into the board.
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Old 25th November 2020, 08:02 AM   #3
rhempz01 is offline rhempz01  United States
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I have the mica insulators and the small to-220 and to-247 silicone type as well. But this is for a DC Audio 5k output transistors. I only have the 1mil/2mil Amber kapton.
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