Hi Kelly,

I know of two manufacturers off hand. Data Circuit Systems (small shop, low to med tech, low to med volume,
some QTA) and Power Circuits (med size fabricator, high tech including microvias, QTA protos through QTA
production) both have the Omikron White Tin in house.

Best regards,

Keith Larson


KELLY M SCHRIVER wrote:

> Hi All -
>
> We are in the process of evaluating alternates to HASL for surface mount
> boards.  Most of our designs are targeted for severe operating environments,
> including military.   This evaluation includes the Omikron White Tin.  It is
> premature to say very much, other than the white tin seems to be the only one
> of the several finishes, other than HASL, which retains full solderability
> thru storage and multiple solder/cleaning process cycles.  Evaluation has not
> yet reached the point of limited production and no product has yet been
> subjected to ESS and beyond.
>
> I would make the following observations: This finish is very flat and uniform,
> free of the crowns which sometimes add to the problems of fine pitch and BGA
> assembly.  It is also lead free, for the point in time that we are faced with
> that issue.
>
> The only shortcoming to date is that a very limited number of board
> fabricators have the process up and running.
> Regards - Kelly
>
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