Hi,
We recently went through an exhausting excersize with tantalums. The
vendor we used to assemble a small lot was not using pre-heat at the
wave solder. The tantalums were thermally overstressed. When
testing at ATE, we experienced some firecrackers. After a back
and forth with the component manufacturer I became convinced that
these tantalums(can't speak for all) were damaged from excessive
heat. Well we beat up our assembly vendor and also learned something
new.
Good luck
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