Visco-elastic effect of underfill material in reliability analysis of flip-chip package

Yoshihiko Kanda, Kunihiro Zama, Yoshiharu Kariya, Takao Mikami, Takaya Kobayashi, Toshiyuki Sato, Toshiaki Enomoto, Koichi Hirata

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

1 Citation (Scopus)

Abstract

The effect of viscoelasticity of underfill on the reliability analysis of flip-chip package by using FEA has been investigated in this study. The analytical result on thermal warpage of a package is different depending on whether the underfill is assumed to be elastic or viscoelastic. The difference is prominent in materials with low Tg, specifically during the cooling process. The viscoelastic effect of the underfill on the fatigue life of the solder bumps is also appears in materials with low Tg, and the predicted fatigue life of a package is about twice as short if the underfill is assumed to be elastic instead of viscoelastic. Thus, the differences in the assumption regarding the viscoelastic properties of the underfill affect the reliability analysis of the packages under thermal cycling condition using FEA.

Original languageEnglish
Title of host publicationProceedings of the ASME InterPack Conference 2009, IPACK2009
Pages755-759
Number of pages5
DOIs
Publication statusPublished - 2010 Jun 25
Event2009 ASME InterPack Conference, IPACK2009 - San Francisco, CA, United States
Duration: 2009 Jul 192009 Jul 23

Publication series

NameProceedings of the ASME InterPack Conference 2009, IPACK2009
Volume1

Conference

Conference2009 ASME InterPack Conference, IPACK2009
CountryUnited States
CitySan Francisco, CA
Period09/7/1909/7/23

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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  • Cite this

    Kanda, Y., Zama, K., Kariya, Y., Mikami, T., Kobayashi, T., Sato, T., Enomoto, T., & Hirata, K. (2010). Visco-elastic effect of underfill material in reliability analysis of flip-chip package. In Proceedings of the ASME InterPack Conference 2009, IPACK2009 (pp. 755-759). (Proceedings of the ASME InterPack Conference 2009, IPACK2009; Vol. 1). https://doi.org/10.1115/InterPACK2009-89152