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January 1997

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Re: fab: immersion tin coatings
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Pratap Singh <[log in to unmask]>
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sam mccorkel wrote:
> 
> I'm looking for any cautions or advice you may have on the following.
> We are considering the use of immersion tin as a finish on bare printed
> circuit boards.
> The boards are thru-hole only and they will be wave soldered within the next
> 3-4 weeks.
> Do you consider this a "no no" or is this an acceptable finish until wave
> soldering?
> 
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Do not use TIN coatings on PCB. Have you not read about Tin-Whisker 
growth on tin coated boards that cause random short failures.

This mechanism has ben documented in several papers. Recently, a few 
emails have beeen posted about the same mechanism. 


-- 
Pratap Singh
Tel./Fax: 512-255-6820
e-mail: [log in to unmask]

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