Chapter 2. COST PER WAFER - Smithsonian - The Chip Collection

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¥ Test wafer cost rises dramatically at the 200mm level as manufacturers use prime polished wafers, rather than reclaimed wafers, for process monitoring. ¥ Studies indicate that some fabs are spending $1 million or more a month on test wafers, which does not include the cost of lost productivity when tools are running these wafers [3] . Conclusions A companyÕs ability to drive down cost per wafer requires an understanding of the cost components. Cost competitiveness is absolutely essential regardless of device market due to the true globalization of todayÕs semiconductor market. WIP or Cycle Time Process Time Manufacturing with High Variability Manufacturing with Low Variability References Cost Per Wafer 1. J. Smits, et.al., ÒLogistics in Fab Design,Ó Future Fab International, p. 101. <strong>2.</strong> 1978-1995 Industry Data Book, Semiconductor Industry Association 3. S. Billat, "Process Control: Covering All of the Bases," Semiconductor International, Sept. 1993, p. 78. Loading Capacity Source: TI 19754 Figure 2-25. <strong>The</strong> Effect of Variability on WIP and Cycle Time INTEGRATED CIRCUIT ENGINEERING CORPORATION 2-19
Cost Per Wafer 2-20 INTEGRATED CIRCUIT ENGINEERING CORPORATION
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Chapter 2. COST PER WAFER - Smithsonian - The Chip Collection

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