Heatsinks for the new Pi-3B+


Evening all,

Apologies if someone else has already asked this and it’s been answered, or if it’s just a daft question, but are there any thermal/electrical/height reasons not to stick a pimoroni supplied 6mm heatsink on the new Pi-3B+'s? (My poor old eyesight can’t tell if the little circle on the top-left of the SoC is a vent hole to allow gas expansion inside the heat spreader, or just a bit of paint for use as an orientation mark).

Cheers in advance for the help!

J :)


I believe it’s a sticker:


Poking a small object into the tiny tiny circle confirms it is indeed a hole, and gas expansion would be a logical reason for it to be there. I’d be wary of sticking a heatsink over it, I’ll see if I can find any details.


Aha! I’m told it’s probably there to allow gas expansion during reflow, and once the CPU has been soldered on. That makes sense!


Thanks for the replies chaps, much appreciated. :)