An analytical stress model is developed for the evaluation of flow induced stresses in wire bonds of plastic packages during molding. We limit our analysis to the stresses acting in the plane of a wire bond. These stresses can possibly result in liftoff of the ball bond from the bonding pad of the integrated circuit. The main purpose of the analysis is to evaluate the effect of the wire bond configuration. It is shown that the stresses in wire bonds are proportional to the square of the ratio of the wire-bond span to the diameter of the wire. This explains the difficulty in molding assemblies with long wire bond spans. We also showed that wire configurations, characterized by nonzero slope angles at the ends, result in lower stresses than conventional wire shapes, where the wedge bond to the electric lead forms a zero angle. The obtained results are useful when designing plastic package assemblies and/or choosing the appropriate wire bond loop height and span.
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March 1991
Research Papers
Predicted Stresses in Wire Bonds of Plastic Packages During Transfer Molding
E. Suhir,
E. Suhir
AT&T Bell Laboratories, Murray Hill, NJ 07974
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L. T. Manzione
L. T. Manzione
AT&T Bell Laboratories, Murray Hill, NJ 07974
Search for other works by this author on:
E. Suhir
AT&T Bell Laboratories, Murray Hill, NJ 07974
L. T. Manzione
AT&T Bell Laboratories, Murray Hill, NJ 07974
J. Electron. Packag. Mar 1991, 113(1): 16-20 (5 pages)
Published Online: March 1, 1991
Article history
Received:
August 27, 1990
Revised:
January 16, 1991
Online:
April 28, 2008
Citation
Suhir, E., and Manzione, L. T. (March 1, 1991). "Predicted Stresses in Wire Bonds of Plastic Packages During Transfer Molding." ASME. J. Electron. Packag. March 1991; 113(1): 16–20. https://doi.org/10.1115/1.2905359
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