Bill,
See "Quality Evaluation Data for Lead-free SMD Peripheral Packages
(Sn-Bi plating) Seiko Epson, Aug. 30, 2002, at
   http://www.epson.co.jp/e/community/pdf/sn-bi__e2_031104.pdf

In the last four months I've collected over 100 books and well over
2,300 papers/magazine articles on designing electronics to be lead-free,
RoHS-compliant, and WEEE-compliant.  Searching my bibliography at
   http://www.dbicorporation.com/rohsbib.htm   ,
this is the only one that jumped out at me from the titles.  Which is
rather curious, because if you look at the "Lead-Free and RoHS-Compliant
Electronic Components" section of my web page
   http://www.dbicorporation.com/rohs.htm
you will see that 21 manufacturers state that they use SnBi lead plating
on some of their parts.  And we can't change to the SnAgCu or SnCu
lead-free solder until all of the components on a board can withstand at
least 245 degrees Celsius soldering temperature...

I know that I've seen more information on mixing SnPb solder with SnBi
platings, including warnings about an SnPbBi alloy that melts at 96
degrees Celsius, but I don't know just where it is hiding in the four
shelves of books and my five-drawer file cabinet.  Oh, well.  That is
why I am trying to summarize all this information, with the reference
sources, in the latter web page.

                John Barnes KS4GL, PE, NCE, ESDC Eng, PSE, SM IEEE
                dBi Corporation
                http://www.dbicorporation.com/

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