Metric · Fab Ops, Yield & Metrology
X-factor
The ratio of actual cycle time to raw process time, measuring how much of a lot's life is spent waiting. An X-factor of 3 means a lot queues for two hours for every hour it is actually being processed.
- Also known as
- Cycle time multiplier, Flow factor
- Type
- Metric
- Domain
- Fab Ops, Yield & Metrology, Fab operations
Notes
X-factor rises sharply once tool utilisation passes roughly 85 percent, the classic queueing-theory knee.
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