Hi Carrie,
1. The causes of voids in SJs are many--moisture, flux/paste volatiles, wave
process, etc.
2. Voids in a PTH-SJ typically have no significant reliability consequence
unless they contain chemicals that attack the surrounding metal.   Mechanically,
the component lead provides excellent connectivity retundancy.
3. Ideally, there are no voids--to my knowledge thare is no spec.

Regards,
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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