I don't know what "white" tin is, but pure tin coating could be a BIG problem.  The slightest bit of moisture
and dendrites grow like crazy at very low voltages (like 3 to 5 volts)!  Better be sure everything is covered
with soldermask or conformal coat.

Gary P.

Rick A. Scovel wrote:

> I have the exact same situation - PCB manufactuer asking customers to convert
> over to "Immersion White Tin"; Please let me know what you find - I will be
> following your thread -
>
> Brian Rusten wrote:
> >
> > Dear Technettes
> >
> > One of our PCB Manufacturers has recently started using the "Omikron"
> > (Immersion White Tin) process as an alternative to Hot Air Leveling.
> > They are asking us (the designers) whether they can use it for our boards.
> >
> > I've looked through the archives, and there seem to be no major problems
> > noted so far. Still, it's a couple of months since it's been discussed,
> > and it is a new(ish) process. So, here goes :
> >
> > Does anyone know of any particular adverse design or assembly implications
> > of using this process? Do you know (even as hearsay) of any problems with
> > the process?
> >
> > Thanks, and Regards
> >
> > Brian Rusten
> >
> > Contract PCB Design Engineer
> > JNA Telecommunications Ltd  Ph (02) 9935 5777      Fax (02) 9417 3862
> > (Now "A Lucent Company")
> >
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