Hi Bill,
Your answers so far have been pretty good. With a 20 I/O LCCC you may get
away with putting 10/90 solder balls of the largest diameter acceptable for
your pitch. This is likely to work unless you are talking large delta-T's
(e.g. automotive) or many cycles (e.g. LEO satellites).
For proper assurance, follow IPC-D-279 or call in a consultant.

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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