How many thermal cycles for rigid PCB before possible latent field failures

Subscribe to Thread

We typically expose our product to 1 to 4 thermal cycles (SM... - Jul 10, 2024 by charliem

Use high tg material on pcbs. Like tg170 or higher. Its a ... - Jul 12, 2024 by taz

Hello, You should contact your PCB suppliers and ask them. ... - Aug 07, 2024 by SMTA-64386252 SMTA

charliem

#91139

How many thermal cycles for rigid PCB before possible latent field failures | 10 July, 2024

We typically expose our product to 1 to 4 thermal cycles (SMT reflow, Wave, Selective solder) depending on product. Unfortunately, like most of us we occasionally have to rework a small # of these which (at least in a localized area) are exposed to an additional thermal cycle. At some point, even if no physical damage is evident, one would think some degradation is occurring. Was wondering if anyone else has worked thru this. I have yet to ask this question of our PCB suppliers. Any input is appreciated. Could not find a previous thread that addressed this specifically.

Charlie

reply »

taz

#91144

How many thermal cycles for rigid PCB before possible latent field failures | 12 July, 2024

Use high tg material on pcbs. Like tg170 or higher. Its a bit more expensive. Board shops usually quote cheapest material just to win the order. When you see fr4 on the quote it usually means tg135-tg140.

reply »

SMTA-64386252

#91289

How many thermal cycles for rigid PCB before possible latent field failures | 7 August, 2024

Hello,

You should contact your PCB suppliers and ask them. Most of PCB suppliers did not recommend exposing PCBs to more than 5 thermal cycles.

This message was posted via the Electronics Forum @ SMTA SMTA