Hi Kenny,
This depends on the severity of the operating conditions. For telecomm 1206's 
were the upper limit—1810's gave premature failures on FR-4.
Now this can be overcome by eliminating the filets t[his also eliminates the 
shrinkage induced CC fractures] and put them on "solder balls/petestals," as I 
suggested in Engelmaier, W., “Lead-Free (LF) Wave-Soldering: Can (Should) It 
Be Eliminated,” Global SMT & Packaging, Vol. 5, No. 9, October 2005, pp. 
46-50.

Werner



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