Raspberry Pi Forums

Hi, I'm looking for a heatsink size for the raspberry pi 4. Can anyone tell me the exact size of the BCM2711? I'm looking for the perimeter of the surface area.
The pi4 mechanical drawing doesn't have this. The closest it comes is showing the center of the chip, but there is no way to infer the size of the chip from what is given.

Thanks,

The top is bevelled. The flat area is 10 mm by 10 mm (as close as I can measure).

joan wrote: ↑

Tue Jul 02, 2019 9:43 pm

The top is bevelled. The flat area is 10 mm by 10 mm (as close as I can measure).

Thank you!

IOTON wrote: ↑

Wed Jul 03, 2019 4:05 am

Sweet. Thank you. This is awesome. Very helpful and should totally be added to an official schematic.

Hmm... How about using a heatsink then? Is it enough to just cool of the top or do i need a special made one to cover the whole chip

webbsmurfen wrote: ↑

Sat Jul 20, 2019 6:16 pm

Hmm... How about using a heatsink then? Is it enough to just cool of the top or do i need a special made one to cover the whole chip

The chip underneath will be smaller than the metal cap (smaller than even the raised area), so the heatsink only needs to make contact with the raised area of the metal cap.

HawaiianPi wrote: ↑

Sat Jul 20, 2019 6:29 pm

webbsmurfen wrote: ↑

Sat Jul 20, 2019 6:16 pm

Hmm... How about using a heatsink then? Is it enough to just cool of the top or do i need a special made one to cover the whole chip

The chip underneath will be smaller than the metal cap (smaller than even the raised area), so the heatsink only needs to make contact with the raised area of the metal cap.

Awesome! I think you just answered two of my questions, this one and another elseware Thanks