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April 2003

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Subject:
From:
Jeff Seeger <[log in to unmask]>
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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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