PERFORMANCE EVALUATIONS OF SURFACE FINISH AND SOLDER ALLOY CONFIGURATIONS FOR BGA SOLDER JOINT RELIABILITYAuthors: Hugh Roberts, et al.
Company: Atotech USA Inc., LSI Corporation, and Amkor Technology
Date Published: 2/12/2009 Conference: Pan Pacific Symposium
The paper summarizes the findings from a major ongoing project to evaluate the performance of several combinations of surface finishes and solder ball alloys for wire-bond BGA package applications. In this phase of the evaluation, high-speed ball shear testing was used as the primary methodology for examining 2nd level solder joint reliability. The solder alloys tested included eutectic SnPb, Sn-2.3Ag and SAC305. The concept of “point of inflection” was used to determine the selected shear speeds for each solder alloy; dependent upon a failure analysis screening that was also performed. The evaluation included high-speed shear testing conducted after ball attach, as well as after extended high-temperature storage conditions.
Results of the high-speed ball shear investigations include analysis of shear strength, total energy and failure mode. Performance comparisons are made relative to solder alloy, surface finish and test condition. All findings are discussed and conclusions are offered with respect to the performance of the various surface finishes and solder alloys and the reliability of the resultant solder joints under the selected test conditions.
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