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- W2114096625 abstract "The chip size package (CSP) is in use in various portable electronic products. Further evaluation of the reliability of its soldered joints is required all the more because these soldered joints are invisible. This study focuses on the thermal fatigue life of soldered joints in the CSP. CSPs were mounted on printed circuit boards (PCBs) in various configurations and mounting conditions, and underwent thermal cycle testing. Then, the fatigue lives of their soldered joints were compared. As a result, the following two facts became apparent. Firstly, reflowing at a 210/spl deg/C peak tends to result in failures that may be derived from poor wetting between solder and pad, in cases where the CSP is mounted on a nickel and gold plated pad. Secondly, the solder joint size has a great influence on its fatigue life. The larger the solder joints that were made, the longer fatigue life they indicated. A finite element method (FEM) analysis of these mounted structures was also executed. The viscoplastic (creep and plastic) properties of solder were evaluated to compute the equivalent inelastic strain occurring in the joints. A parameter in the Coffin-Manson equation is obtained from the computed inelastic strain amplitudes and the experimentally obtained fatigue lives. This result enables us to estimate the fatigue life of CSP solder joints without actual tests." @default.
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- W2114096625 date "2002-11-27" @default.
- W2114096625 modified "2023-10-18" @default.
- W2114096625 title "Reliability of soldered joints in CSPs of various designs and mounting conditions" @default.
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- W2114096625 doi "https://doi.org/10.1109/iemtim.1998.704627" @default.
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