Jo,
Unfortunately, the advice given that larger volume solder joints are more
robust is bad advice. Solder joints are robust when good wetting has taken
place and not otherwise. A properly wetted solder joint has all the strength
it ever needs except for some extreme HALT or HASS tests which are
inappropriate in the first place for solder joints. Studies hav shown, that
smaller solder fillets for in particular caps lead to higher reliability,
primarily because of reduced component cracking. Yield will also increase
because of a lower tendency of tombstoning.

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]

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