Dave,

You are right that there is a difference between general and consumer
electronics and "high performance" electronics.    That does not mean, however, that
experience gained in general and consumer electronics is totally irrelevant to
high performance electronics.   A solder joint does not "know" whether it is
in a walkman or a jet fighter.   All it "knows" is the mechanically and
thermally induced stresses and strains to which it is subject and there can be some
overlap in that range of "experience".  In fact given the intrinsic weakness
of tin-lead solder part of the design of joints for high performance
electronics has been to try to ensure (e.g. by building in stress relief and reducing
thermal mismatch) that the solder joints are not subject to stresses and strains
that are too much more extreme than those experienced by a soldered joint in
a walkman.    The rapidly accumulating experience in consumer and general
electronics can provide a  foundation on which high performance electronics can
build.   As I have mentioned previously that is how confidence in tin-lead
solder was developed.

Keith Sweatman
Nihon Superior Co., Ltd

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