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Weak joint strength and black residue

Electronics Forum | Fri Jun 08 17:22:51 EDT 2007 | naynayno

We have been producing an IMS assembly with SMT dpak's for some time. However, we recently encountered a new problem by chance - the parts can be flicked off with a finger nail. I state by chance because the solder joints are wetted and shiny with

D-pak end joint wetting

Electronics Forum | Sun Apr 19 12:54:39 EDT 2020 | davef

A-620G doesn't require 100% wetting to the thermal pad. It requires 100% wetting to the land in the end-joint area. The end joint is the portion of the solder connection that is at the top [or bottom] of the connection. Look at 7.1.3 Solder Joint A

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