In process stress analysis of flip-chip assemblies during underfill cure

Low cost flip chip on board assemblies are analyzed during the underfill cure process to determine residual stress generation. In situ stress measurements are performed over the active face of the die during processing and relative in-plane stresses are measured. Experimental measurements are made u...

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Published in:Microelectronics and reliability 2000-07, Vol.40 (7), p.1181-1190
Main Authors: Palaniappan, P, Baldwin, Daniel F
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Language:English
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description Low cost flip chip on board assemblies are analyzed during the underfill cure process to determine residual stress generation. In situ stress measurements are performed over the active face of the die during processing and relative in-plane stresses are measured. Experimental measurements are made using flip-chip test vehicles, based on the Sandia National Laboratories’ ATC04 assembly test chip. Four different commercial underfill materials have been evaluated and a relative comparison is presented with respect to the residual stresses produced by each underfill on the flip-chip assemblies. Significant stress variations are observed between the four underfills studied. Correlation between the glass transition temperature ( T g) and storage modulus ( G ′) are made relative to residual stresses produced during underfill cure. Stress relaxation characteristics are also evaluated for the low cost flip-chip assemblies.
doi_str_mv 10.1016/S0026-2714(00)00045-7
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title In process stress analysis of flip-chip assemblies during underfill cure
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