Evaluation of Thermal Deformation in Electronic Packages

  • Beom, Hyeon-Gyu (Department of Mechanical Engineering, Chonnam National University) ;
  • Jeong, Kyoung-Moon (Department of Mechanical Engineering, Chonnam National University)
  • Published : 2000.02.01

Abstract

Thermal deformation in an electronic package due to thermal strain mismatch is investigated. The warpage and the in-plane deformation of the package after encapsulation is analyzed using the laminated plate theory. An exact solution for the thermal deformation of an electronic package with circular shape is derived. Theoretical results are presented on the effects of the layer geometries and material properties on the thermal deformation. Several applications of the exact solution to electronic packaging product development are illustrated. The applications include lead on chip package, encapsulated chip on board and chip on substrate.

Keywords

References

  1. Beom, H. G. and Earmme, Y. Y., 1999, 'The Elastic Field of an Elliptic Cylindrical Inclusion in a Laminate with Multiple Isotropic Layers,' ASME Journal of Applied Mechanics, Vol. 66, pp. 165-171
  2. Jones, R. M., 1975, Mechanics of Composite Materials, McGraw-Hill, New York
  3. Kelly, G., Lyden, C., Lawton, W., Barrett, J., Saboui, A., Exposito, J. and Lamourelle, F., 1994, 'Accurate Predictions of PQFP Warpage,' Proceedings of the 44th Electronic Components and Technology Conference, pp. 102-106 https://doi.org/10.1109/ECTC.1994.367644
  4. Kelly, G., Lyden, C., Lawton, W., Barrett, J., Saboui, A., Pape, H. and Peters, H. J. B., 1996, 'Importance of Molding Compound Chemical Shrinkage in the Stress and Warpage Analysis of PQFP's,' IEEE Transactions on Components, Packaging, and Manufacturing Technology Part B, Vol. 19, pp. 296-300 https://doi.org/10.1109/96.496032
  5. Lau, J. H., 1993, Thermal Stress and Strain in Microelectronics Packaging, Van Nostrand Reinhold, New York
  6. Suhir, E., 1993, 'Predicted Bow of Plastic Packages of Integrated Circuit (IC) Devices,' J. Reinforced Plastics & Composites, Vol. 12, pp. 952-972 https://doi.org/10.1177/073168449301200903
  7. Suhir, E. and Manzione, L. T., 1992, 'Predicted Bow of Plastic Packages Due to the Nonuniform Through-Thickness Distribution of Temperature,' ASME Journal of Electronic Packaging, Vol. 114, pp. 329-335
  8. Zheng, D., Hwang, R. P., Dou, X., Yeh, C., Prakash, M., Boardman, K. and Ridsdale, G., 1997, 'Warpage Analysis of 144-Pin TQFP During Reflow Using Image Processing,' Proceedings of the 47th Electronic Components and Technology Conference, Vol. 2, pp. 1176-1181 https://doi.org/10.1109/ECTC.1997.606324