Thread: SMD failures
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Old 30th Nov 2021, 2:29 pm   #2
Radio Wrangler
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Default Re: SMD failures

Quote:
Originally Posted by Wendymott View Post
.am I being too "tight" re using caps ??
Yes, for SMT multilayer capacitors. Thermal shock of soldering them by hand is risky, they are easily cracked and cracks don't necessarily show.

The little devils are supposed to be stored in low humidity environments before use. Dried in ovens if necessary, placed on two dods of solder paste, and then heated to soldering temperature and back down using carefully controlled time/temp profiles which can be quite complex.

This way, they're pretty reliable. Modern production plans crash in flames if there is any significant DOA rate.

Done with a hand soldering iron, warm the pad on the board by partial contact with the iron and with the part touching the pad. Use its thermal mass to filter the rise rate.

Sneaky soldering!

David
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