Unformatted text preview: of the tool group’s production capacity than does 100 wafers per week of Product B (27.2% versus 40.8%). Tool Group Z is used by only one product. Step 2. Identifying Mix-Sensitive Tool Groups that May Become Capacity Constraints The capacity model is then run once for each product, with each run's production volume consisting 100% of a different product in the model. For each run, the capacity software generates a capacity loading estimate for each tool group. Capacity loading is defined as the actual throughput of the tool group divided by the maximum possible throughput of the tool group (after subtracting downtime). Any tool group loaded more than 85% in any run is noted 2. © 1999 IEEE. Reprinted, with permission, from Proceedings of the 1999 IEEE International Symposium on Semiconductor Manufacturing Conference, Santa Clara, CA, October 11-13, 1999, 73-76. loading percentage points per wafer. Note that 103.2% is the capacity loading for Tool Group X calculated by the capacity software for the model run with 100% of volume dedicated to Product C; while 64....
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- Semiconductor device fabrication, Headway, tool group