Hi Steve - my comments:
1) There are ImSn pwb surface finish formulations that will produce tin
whiskers and there are ImSn pwb surface finish formulations that will not
produce tin whiskers. Conduct testing and don't completely believe the
Marketing literature.
2) There are only a handful of published reports (3) which show a tin
whisker growing out of SAC305 solder. The reports show that excessive
ionic cleanliness levels were the root cause of the tin whiskers. There
are several industry investigation currently in progress on the specific
topic of ionic cleanliness levels and tin whiskers. Best guess is that
some of the investigations will be published later this year.
Dave Hillman
Rockwell Collins
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Steve Kelly <[log in to unmask]>
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[TN] Tin Whiskers
Hi All,
Two questions today:
1) Any known instances of tin whiskering when the finish is Immersion
Tin
2) Any known instances of tin whiskering after the immersion tin is
soldered with a RoHS compliant solder such as SAC 305.
Thanks. Steve Kelly
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Steve Kelly
(416) 750-8433 (work)
(416) 750-0016 (fax)
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