Abstract
The purpose of this paper is to provide an overview of SnAgCu solder joint fatigue in BGA/CSP/flip-chip applications and the concern of long-term reliability. The most common mode of failure is ductile fracture due to creep strain. Several methods of predicting the overall life of the solder joint are the Coffin-Manson approach, a constitutive fatigue law, and a damage based model using FEM (finite element methods). The effects of underfill and its processes as well as design considerations that will increase reliability will also be discussed.
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