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RESEARCH PAPERS

Failure Analysis of No-Clean and Water-Clean Solder Joints 0.4 mm Pitch, 256-Pin Plastic Quad Flat Pack

[+] Author and Article Information
R. K. Govila, Y.-H. Pao, C. Larner

Research Laboratory, Ford Motor Co., Mail Drop #2313, P.O. Box 2053, Dearborn, MI 48121-2053

J. Lau

Hewlett Packard Co., Palo Alto, CA 94304

S. Twerefour

Ford Microelectronics Inc., Colorado Spring, CO 80921

S. Erasmus

Hewlett-Packard Co., Palo Alto, CA 94304

S. Dolot

Research Laboratory, Ford Motor Co., Dearborn, MI 48121-2053

J. Electron. Packag 116(3), 184-190 (Sep 01, 1994) (7 pages) doi:10.1115/1.2905684 History: Received December 13, 1993; Revised May 23, 1994; Online April 28, 2008

Abstract

Printed circuit boards populated with twenty-five 0.4 mm pitch, 256-pin plastic quad flat packs (QFP) containing no-clean and water-clean solder joints were subjected to thermal cycling in order to induce thermal fatigue failure. QFPs failed from a minimum of 0.27 cycle to a maximum of 5310 cycles. Solder joints in both types of units were examined in the scanning electron microscope, and a relative comparison of the extent of fatigue damage is presented. The failure associated with cracking in the eutectic composition Sn/Pb solder initiated at the stress concentration sites. Crack propagation continued either along the pin-solder interface or solder-pad interface and ultimately resulted in the separation of the pin/pad junctions. In addition, a qualitative and quantitative comparison of the resulting solder micro-structure and the failure mode between the no-clean and the water-clean QFP solder joints was made and discussed.

Copyright © 1994 by The American Society of Mechanical Engineers
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