Mitigation of thermal fatigue failure in fully underfilled lead-free array-based package assemblies using partial underfills

Hong Bin Shi, Toshitsugu Ueda

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    7 Citations (Scopus)

    Abstract

    A design of experiments was conducted to determine the thermal cycling reliability of full and partial capillary flow underfilled lead-free chip scale packages (CSPs), the tests were carried out based on the JEDEC JESD22-A104C standard. Two kinds of representative fast cure and reworkable underfill materials are used in this study, and CSPs without underfill were also tested for comparison. The test results show that both two underfill materials reduce the thermal cycling reliability of CSP assemblies. The underfill with high glass transition temperature (Tg) and storage modulus yielded better performance, of course, the CTE is also very critical to the thermomechanical fatigue performance, but its effects is not so obvious in this study due to the similar CTE of used underfills. In addition, the negative effect of partial underfill is smaller than that of full underfill. Failure analysis shows that the dominant failure mode observed is solder cracking near package and/or PCB pads.

    Original languageEnglish
    Title of host publication2011 IEEE 13th Electronics Packaging Technology Conference, EPTC 2011
    Pages542-547
    Number of pages6
    DOIs
    Publication statusPublished - 2011
    Event2011 IEEE 13th Electronics Packaging Technology Conference, EPTC 2011 - Singapore
    Duration: 2011 Dec 72011 Dec 9

    Other

    Other2011 IEEE 13th Electronics Packaging Technology Conference, EPTC 2011
    CitySingapore
    Period11/12/711/12/9

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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  • Cite this

    Shi, H. B., & Ueda, T. (2011). Mitigation of thermal fatigue failure in fully underfilled lead-free array-based package assemblies using partial underfills. In 2011 IEEE 13th Electronics Packaging Technology Conference, EPTC 2011 (pp. 542-547). [6184480] https://doi.org/10.1109/EPTC.2011.6184480