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June 2008

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Fri, 13 Jun 2008 08:52:28 +0300
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The short answer: long enough to give a short answer.

Brian

Graham Collins wrote:
> 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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