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Subject:	Re: Solder joint flex cracking in Lead-Free environment
From:	Werner Engelmaier /* <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:	Mon, 3 Mar 2008 20:04:41 EST
Content-Type:	text/plain
Parts/Attachments:	text/plain (35 lines)

Hi Dave,
For SAC solders the situation will be worse than with SnPb because of the 
stiffer solder (modulus of elasticity about 40% higher) and much lower creep 
rates. This has led to failure modes previously not seen and others, like RC 
cracking worse than before, because much higher stresses result with the same 
amount of strain.
Good luck.

Regards,
Werner Engelmaier
可靠性先生
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com


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