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Ted Mooney, P.E. RET
Pine Beach, NJ

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Causes of solder tombstoning effect?

I have this query for advise regarding case of tombstoning effect during mounting assembly process. (But this has nothing to do with your product.) As we all know several and major reasons for tombstoning effect will be solder may wet at 1 terminal more quickly than the other because of differences in heat capacity, or the other termination may be more solderable than the other, or due to faulty solder paste application, or due to faulty chip placement. But for the 2 scenarios below, please advise if these may be possible causes of tombstone:

Scenario 1) What if the other termination is plated much thicker than the other termination. Would this cause tombstoning effect?
Scenario 2) Or what if the terminations were beyond the specified termination thickness, would this also cause tombstoning effect?

Jacqueline Abelarde
automotive - Manila, Philippines
2006

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