Effect of stiffness and thickness ratios on popcorn cracking in IC packages

Ching Hwei Chue, Teng Hui Chen, Hwa-Teng Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

During the solder reflow process, popcorn cracking will occur in integrated circuit (IC) package under vapor pressure and thermal load. Based on the elasticity theory, the singular stress field around the apex of the delaminated interface between die-pad and resin is obtained numerically. The generalized stress intensity factors are computed to evaluate the residual strength of the structure. Also, the structural stability is discussed by using the strain energy density theory. Two factors that are concerned in this paper include the relative stiffness ratio Edie-pad/Eresin and the relative thickness h̄. The results show that lower stiffness ratio gives weaker stress singularity. In addition, larger h̄ will increase generalized stress intensity factors and structural stability. As a conclusion for our case, moderate value of h̄ (say h̄ = 0) is recommended for design.

Original languageEnglish
Pages (from-to)340-348
Number of pages9
JournalIEEE Transactions on Components and Packaging Technologies
Volume26
Issue number2
DOIs
Publication statusPublished - 2003 Jun 1

Fingerprint

Stress intensity factors
Integrated circuits
Stiffness
Thermal load
Strain energy
Vapor pressure
Soldering alloys
Elasticity
Resins

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

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title = "Effect of stiffness and thickness ratios on popcorn cracking in IC packages",
abstract = "During the solder reflow process, popcorn cracking will occur in integrated circuit (IC) package under vapor pressure and thermal load. Based on the elasticity theory, the singular stress field around the apex of the delaminated interface between die-pad and resin is obtained numerically. The generalized stress intensity factors are computed to evaluate the residual strength of the structure. Also, the structural stability is discussed by using the strain energy density theory. Two factors that are concerned in this paper include the relative stiffness ratio Edie-pad/Eresin and the relative thickness h̄. The results show that lower stiffness ratio gives weaker stress singularity. In addition, larger h̄ will increase generalized stress intensity factors and structural stability. As a conclusion for our case, moderate value of h̄ (say h̄ = 0) is recommended for design.",
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Effect of stiffness and thickness ratios on popcorn cracking in IC packages. / Chue, Ching Hwei; Chen, Teng Hui; Lee, Hwa-Teng.

In: IEEE Transactions on Components and Packaging Technologies, Vol. 26, No. 2, 01.06.2003, p. 340-348.

Research output: Contribution to journalArticle

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AU - Lee, Hwa-Teng

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