I am in the process of evaluating white tin as an alternate surface
finish for our assemblies that contain fine pitch (<20mil) and uBGA devices,
as HASL provides too many 'challenges' for high yields with such components.

        I have found that our current stateside suppliers, whom we use for
proto and low volume turns, all farm out the immersion tin processing
portion to secondary vendors. And our current offshore (volume) vendor is
just starting to 'test the waters' with white tin, using the Stannatech
process, also through a secondary vendor.

        As I would like to qualify any evaluation fabs (and future
purchases) from a source that performs their own white tin process in-house,
I am looking for leads on both local and offshore suppliers who have
internal capability for white tin. Also, any feedback on experiences with
Atotech's Stannatech vs Omikron vs Dexcoat would be appreciated.

        Onward into the fog....

Mike McMonagle
PCBA Process Engineering
Telxon Corporation
(713) 307-2443 Phone
(713) 307-2581 Fax
http://www.telxon.com

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