Screwing PCB to heatsink may cause flexion and damage to ceramic capacitors?

Forum Screwing PCB to heatsink may cause flexion and damage to ceramic capacitors?

X****Liu

387 1 Sep 28.2019, 12:32:13

Hello
We have a SMD_only SMPS PCB of 10W which we screw to a flat heatsink surface. There is a rubbery thermal pad between PCB and heatsink.
The PCB is 6cm x 15cm x 1.6mm thick. There are five screws which screw the PCB to the heatsink….one in each corner, and one in the middle.
There are multiple SMD ceramic capacitors on the PCB. Do you think that as the screws are tightened up one by one, that there is a risk of PCB flexion causing some of the ceramic capacitors to break.?

X****Liu