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Ultra-fine pitch flip-chip assembly using isotropic conductive adhesives

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5 Author(s)
Stoyanov, S. ; Centre for Numerical Modelling & Process Anal., Univ. of Greenwich, UK ; Kay, R. ; Bailey, C. ; Desmuilliez, M.
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This paper discusses results from a highly interdisciplinary research project which investigated different packaging options for ultra-fine pitch, low temperature and low cost flip-chip assembly. Isotropic Conductive Adhesives (ICAs) are stencil printed to form the interconnects for the package. ICAs are utilized to ensure a low temperature assembly process of flip-chip copper column bumped packages. Results are presented on the structural integrity of novel electroformed stencils. ICA deposits at sub-100 micron pitch and the subsequent thermomechanical behaviour of the flip-chip ICA joints are analysed using numerical modelling techniques. Optimal design rules for enhanced performance and thermomechanical reliability of ICA assembled flip-chip packages are formulated.

Published in:

Electronics Packaging Technology, 2003 5th Conference (EPTC 2003)

Date of Conference:

10-12 Dec. 2003