Good day TechNet
A tin whisker question.  

If (hypothetically, as this thankfully hasn't been built yet) a pure tin finish part is used, what sort of length whisker could happen?

What we are looking at is this: a part we want to use is only available with a pure tin finish on copper.  Matte tin, not bright.  So if we use it, and a tin whisker grows, how long might it grow?  If the part is (for example) 10mm away from adjacent parts, and a realistic maximum whisker length is less than that, it obviously mitigates (YES, but does not entirely remove) the risk.

The only value I've seen is in a Dave Hillman/Doug Pauls presentation from Apex 05, wherein it is stated that they "can be 9.5mm long".  Dave /  Doug, any comment on this?  Can you cite a source?  Does matte vs bright tin make a difference?

regards,
 
Graham Collins
Halifax Production Engineering
(902) 873-2000 ext. 6215


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