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• W2029167029 endingPage "610" @default.
• W2029167029 startingPage "602" @default.
• W2029167029 abstract "Wafer level packaging (WLP) has many advantages, such as ease of fabrication and reduced fabrication cost. However, solder joint reliability of traditional WLPs is the weakest point of the technology. In this paper, a 0.4 mm pitch Cu post type WLP has been developed for mobile computing application. The Cu post type WLP has 440 I/Os and 12 × 12 mm die size. The initial design WLP has been fabricated and subjected to a thermal cycling (TC) testing. The failure life of the original WLP under TC was 296 cycles. This paper also presents a nonlinear finite element analysis of the board level solder joint reliability and methods for enhancement of the WLP. A viscoplastic constitutive relation is adopted for the solder joints to account for its time and temperature dependence in TC. The fatigue life of the solder joint is estimated by the modified Coffin–Manson equation. The two coefficients in the modified Coffin–Manson equation are also determined. A series of parametric studies are performed by changing the passivation (PI) thickness, redistribution layer (RDL) thickness, polymer height (Cu post height accordingly varies), die thickness, PCB thickness, and PCB CTE. The results obtained from the modeling are useful to formulate design guidelines for board level reliability enhancement of the WLP." @default.
• W2029167029 created "2016-06-24" @default.
• W2029167029 creator A5003913031 @default.
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• W2029167029 date "2008-04-01" @default.
• W2029167029 modified "2023-09-26" @default.
• W2029167029 title "Board level solder joint reliability analysis of a fine pitch Cu post type wafer level package (WLP)" @default.
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• W2029167029 doi "https://doi.org/10.1016/j.microrel.2007.05.009" @default.
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