Hi Clavius,
The answer is NO, there has not been enough work done on the reliability of
lead-free solders. However, enough work has been done to show the same trends
apply as to near-eutectic Sn/Pb and that the answers are off by no more than
a factor of 2 to 3 in most cases.
However, in your question you imply that "HASS &/or HALT reflect a years of
field life;" neither HASS nor HALT does any such thing for either leaded or
lead-free solders. You may want to look at IPC-SM-785.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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