I must have annoyed him, Brian is being short with me.
Actually though, I am really surprised Dewey has let this one go.
That's really big of him.
regards,
- Graham
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Friday, June 13, 2008 1:21 PM
To: [log in to unmask]
Subject: Re: [TN] Tin Whiskers - how long? Size matters!
:-)
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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