Hi 'jschreiner',
Are you sure you have wetting to the leads? What you describe is not 'soft
solder', whatever that may be, but sounds like not metallurgical connection.
You should be able to tell, because if you do not have wetting, there will be
no solder on the lead surface that was nearest the pad. That could mean, (1)
the reflow profile is too low ( especially with a large heat sink in place you
shopuld be measuring it), (2) you have none solderable leads, because of (a)
contamination, (b) maybe Alloy 42 leads.

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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