nickita 发表于 2010-8-31 17:18:14

DRAM構裝體Warpage定義

1. If the coplanarity of solder ball exceeds 4Mil, it will be rejected.
2. If the package coplanarity diverge from Warpage-Factor criteria, it is also rejected.
    P.S. Warpage-Factor(WF) = PKG warpage / PKG length
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