Finite element modeling is widely used for estimating the solder joint reliability of electronic packages. In this study, the electronic package is a CSP mounted on a printed circuit board (PCB) using an area array of solder joints varying from 5×4 up to 7×7. An empirical model for estimating the reliability of CSP solder joints is derived by correlating the simulated strains to thermal cycling results for 20 different sample configurations. This empirical model translates the inelastic strains calculated by nonlinear three-dimensional (3D) finite element simulations into a reliability estimation or By comparing with the results of reliability tests, it can be concluded that this model is accurate and consistent for analyzing the effect of solder joint geometry. Afterwards, parameter sensitivity analysis was conducted by integrating a design of experiment (DOE) analysis with the reliable solder fatigue prediction models, following the method of simulation-based optimization. Several parameters are analyzed: the PCB parameters (elastic modulus, coefficient of thermal expansion, thickness), the chip dimensions (area array configuration), and the parameters defining the solder joint geometry (substrate and chip pad diameter, solder volume). The first study analyzes how the solder joint geometry influences the CSP reliability. A second study is a tolerance analysis for six parameters. These parameters can have a tolerance (=accuracy) of their nominal value, and it is shown that these small tolerances can have a significant influence on the solder joint reliability.
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December 2003
Technical Papers
Parameterized Modeling of Thermomechanical Reliability for CSP Assemblies
Eric Beyne,
Eric Beyne
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
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Kouchi (G.Q.) Zhang,
Kouchi (G.Q.) Zhang
CFT/Philips, P.O. Box 218, 5600 MD Eindhoven, The Netherlands
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Jo Caers,
Jo Caers
CFT/Philips, P.O. Box 218, 5600 MD Eindhoven, The Netherlands
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Dirk Vandepitte,
Dirk Vandepitte
Catholic University of Leuven, Celestijnenlaan 300A, B-3001 Leuven, Belgium
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Martine Baelmans
Martine Baelmans
Catholic University of Leuven, Celestijnenlaan 300A, B-3001 Leuven, Belgium
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Bart Vandevelde
Eric Beyne
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
Kouchi (G.Q.) Zhang
CFT/Philips, P.O. Box 218, 5600 MD Eindhoven, The Netherlands
Jo Caers
CFT/Philips, P.O. Box 218, 5600 MD Eindhoven, The Netherlands
Dirk Vandepitte
Catholic University of Leuven, Celestijnenlaan 300A, B-3001 Leuven, Belgium
Martine Baelmans
Catholic University of Leuven, Celestijnenlaan 300A, B-3001 Leuven, Belgium
Contributed by the Electronic and Photonic Packaging Division for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received Nov. 2002. Associate Editor: L. Ernst.
J. Electron. Packag. Dec 2003, 125(4): 498-505 (8 pages)
Published Online: December 15, 2003
Article history
Received:
November 1, 2002
Online:
December 15, 2003
Citation
Vandevelde, B., Beyne, E., Zhang , K. (., Caers, J., Vandepitte , D., and Baelmans, M. (December 15, 2003). "Parameterized Modeling of Thermomechanical Reliability for CSP Assemblies ." ASME. J. Electron. Packag. December 2003; 125(4): 498–505. https://doi.org/10.1115/1.1604150
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