Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Fracture Analysis of Electronic IC Package in Reflow Soldering Process

  • Yang, Ji-Hyuck (Currently, Hyundai Motor Company) ;
  • Lee, Kang-Yong (School of Mechanical Engineering, Yonsei University) ;
  • Lee, Taek sung (Department of Mechanical Design Engineering, Korea Polytechnic University) ;
  • Zhao, She-Xu (Department of Engineering Mechanics, Shanghai Jiaotong University)
  • Published : 2004.03.01
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Abstract

The purposes of the paper are to analyze the fracture phenomenon by delamination and cracking when the encapsulant of plastic IC package with polyimide coating shows viscoelastic behavior under hygrothermal loading in the IR soldering process and to suggest more reliable design conditions by the approaches of stress analysis and fracture mechanics. The model is the plastic SOJ package with the polyimide coating surrounding chip and dimpled diepad. On the package without cracks, the optimum position and thickness of polyimide coating to decrease the maximum differences of strains at the bonding surfaces of parts of the package are studied. For the model delaminated fully between the chip and the dimpled diepad, C(t)-integral values are calculated for the various design variables. Finally, the optimal values of design variables to depress the delamination and crack growth in the plastic IC package are obtained.

Keywords

References

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