Hi Wayne,
Thank you for sharing the data.
WhAat you say certainly points out the glaring need for having an adequate
solder fatigue model for these lead-free solders. The data required to
develop such a model do not exist--we need data of the quality that Roger
Wild of IBM produced for Sn/Pb solders. Until we have such a model, no valid
reliability comparison for the lead-free vs. Sn/Pb solders can be drawn for
actual use in product.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 386-437-8747, Fax: 386-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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