Quantitative Characterization of a Flip-Chip Solder Joint

[+] Author and Article Information
S. K. Patra, Y. C. Lee

Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309

S. S. Sritharan

Department of Mathematics, University of California, Los Angeles, CA 90024-1555

J. Appl. Mech 62(2), 390-397 (Jun 01, 1995) (8 pages) doi:10.1115/1.2895943 History: Received June 15, 1993; Revised November 17, 1993; Online October 30, 2007


Based on an energy minimization principle, a mathematical/numerical model has been developed to study the impact of design and process variations associated with flip-chip solder joint on its ability to align in lateral and axial direction. The minimum-energy shape needed for joint evaluation is computed by a novel numerical method based on motion by mean curvature. The analysis shows that (1) the magnitude of the reaction force in lateral and axial direction reduces with increase in solder volume, (2) the normal reaction is an order of magnitude higher compared to the lateral reaction (restoring force) thus making the joint more susceptible to lateral misalignment compared to the axial misalignment, and (3) the axial misalignment is primarily dictated by the accuracy of the solder deposition height.

Copyright © 1995 by The American Society of Mechanical Engineers
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