Reducing the overkills and retests in wafer testing process

S. C. Horng, S. Y. Lin*, M. H. Cheng, F. Y. Yang, C. H. Liu, W. Y. Lee, C. H. Tsai

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations


Reducing overkills is one of the main objectives in wafer testing process, however the major mean to prevent overkills is retest. In this paper, we formulate the problem of reducing overkills and retests as a stochastic optimization problem to determine optimal threshold values concerning the number of good dies and the number of bins in a lot and wafer to decide whether to go for a retest after a regular wafer probing. The considered stochastic optimization problem is an NP hard problem. We propose an Ordinal Optimization theory based two-level method to solve the problem for good enough threshold values to achieve lesser overkills and retests within a reasonable computational time. Applying to a case based on the true mean of bins of a real semiconductor product, the threshold values we obtained are the best among 1000 sets of randomly generated threshold values in the sense of lesser overkills under a tolerable retest rate.

Original languageEnglish
Pages (from-to)286-291
Number of pages6
JournalIEEE International Symposium on Semiconductor Manufacturing Conference, Proceedings
StatePublished - 2003
Externally publishedYes
EventThe 14th Annual IEEE/SEMI; Advanced Semiconductor Manufacturing Conference and Workshop 2003 - Munich, Germany
Duration: 31 03 200301 04 2003


  • Ordinal optimization
  • Overkill
  • Retest
  • Stochastic optimization
  • Wafer testing


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