Simulations of process-induced warpage during IC encapsulation process

Shiang Yu Teng, Sheng-Jye Hwang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Warpage during integrated circuit encapsulation process is a serious problem. Previous researchers had focused on warpage analysis with thermal-induced shrinkage and the cure-induced shrinkage was neglected. A new approach considering both cure- and thermal-induced shrinkage during encapsulation process was presented to predict the amount of warpage. The cure-induced shrinkage was described by the pressure-volumetemperature-cure (P-V-T-C) equation of epoxy. The thermal-induced shrinkage was described by the coefficients of thermal expansion of the component materials. The thin small outline package (TSOP) DBS-27P and low-profile quad flat package (LQFP) LQFP-64, which were manufactured by Philips Semiconductor located in Taiwan and Siliconware Precision Industries Corporation, respectively, were chosen to be the simulation models. By comparing the amount of predicted warpage with the experimental results, it showed that the approach could better predict the amount of warpage than that considering only thermal-induced shrinkage. It was also found that the sign of cure-induced warpage could be opposite to the thermal-induced warpage. Appropriate design of a package to make cure- and thermal-induced shrinkage to be of opposite sign could minimize the warpage of a package.

Original languageEnglish
Pages (from-to)307-315
Number of pages9
JournalJournal of Electronic Packaging, Transactions of the ASME
Issue number3
Publication statusPublished - 2007 Sep 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Computer Science Applications
  • Electrical and Electronic Engineering


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