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Date: | Fri, 13 Jun 2008 12:20:43 EDT |
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:-)
In a message dated 6/12/2008 10:53:45 P.M. Pacific Daylight Time,
[log in to unmask] writes:
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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