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Date: | Wed, 30 Apr 2003 11:50:18 -0400 |
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Franklin D Asbell wrote:
>
> The board shop would only be at fault (partially) in this case if they
> failed to express the fact that immersion tin is a poor coating for
> press-fit connectors...the remaining fault would be the process or design
> personnel...
> snip <
That's an interesting response, since we've had reputable
fab vendors recommend IWT finish for pressfit. Apparently
it is easier to maintain tight hole size tolerances with
this compared to HASL.
What issue makes IWT a poor choice for pressfit, if you've
got a good process with uniform results? (personally, I'm
more nervous about leaving IWT unpassivated (ie soldered)
in long lived equipment due to possible whisker growth)
TRhanks,
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
jseeger "at" appliedcad "dot" com 978 649 9800
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