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How to mount transistors to heat sink
How to mount transistors to heat sink
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Old 17th July 2017, 05:07 PM   #11
JeffYoung is offline JeffYoung  Ireland
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How to mount transistors to heat sink
Thanks for the tip, Eric. I'm using a heatsink design with a flange similar to the production FirstWatt units, so I'll make sure there's no lip on the front edge as well.
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Old 17th July 2017, 07:51 PM   #12
danny_66 is offline danny_66  Belgium
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Quote:
Originally Posted by JeffYoung View Post
I can easily get Silpads and Aluminium Oxide
Best is Alumina for the DIYer.
Those silpads are more for automatic installation or when it needs to go fast and don't have the time to mess with goop
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Old 15th November 2017, 12:45 PM   #13
bhpistorqintorpm is offline bhpistorqintorpm  India
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make sure you counter sink the holes on your heat sink.

Click the image to open in full size.

also, polish the surface since extruded Aluminium surface is far from even..
Click the image to open in full size.

finally, in my case i've made use of Copper spreader which bolted onto the heat-sink. and transistor is placed over it pressed down by Aluminium plate.

heatsink +
thermal paste+
Copper Spreader+
thermal paste+
Kapton tape+
thermal paste+
transistor

this set up has been working fine for me for past few months.
Click the image to open in full size.
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Old 15th November 2017, 01:48 PM   #14
JeffYoung is offline JeffYoung  Ireland
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How to mount transistors to heat sink
Thanks guys. Heatsinks holes are chamfered; surface is polished. I'm going to start with heatsink/goop/mica/goop/transistor and see how I get on.

Cheers,
Jeff.
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Old 15th November 2017, 02:23 PM   #15
balerit is offline balerit  South Africa
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Plain silicone pads are fine. Here is something I do when soldering a few transistors to a pcb, using a jig:

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Last edited by balerit; 15th November 2017 at 02:27 PM.
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