TO220 heatsink with thick base and fins?

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cupoftea

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Thanks, the back bit isnt thick enough. You need a thick back right up against the FET to take the heat out of the FET.
 

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36 °C/W, TO-220, 25 mm, 25 mm, 6.5 mm​

50 °C/W, TO-220, 13.2 mm, 12.7 mm, 19.1 mm​

15 °C/W, SOT-32, TO-220, 25.4 mm, 13 mm, 30 mm​

14 °K/W ................. 16 mm, 16 mm, 50 mm

The Rth specs assume lots of space around the heatsink, which you do not appear to have, so do not under-design it. Parallel heatsinks are not like parallel resistors for Rth.

But my guess (?) is you are just trying to add mass to absorb power-on transient.







 
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Thanks, we are indeed space constrained.
The SK 469 35 STS looks best, as we have 36mm height available
The PCB is vertical mounted so the verticality of the heatsink will be violated, and it will be horizontal.
 

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cupoftea said:
The PCB is vertical mounted so the verticality of the heatsink will be violated, and it will be horizontal.
Click to expand...
Then for best heatsink operation you need to mount the heat sink flat on the PCB so the fins run vertically.
 
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