Semiconductor Fab Equipment Manufacturing worked example

Acceptance Throughput at 65% tool acceptance-test uptime: a worked example

Suppose tool acceptance-test uptime falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate acceptance throughput for semiconductor fab equipment manufacturing using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Wafers accepted per acceptance-test cycle: 4 units / cycle (held at the documented default)
  • Acceptance-test cycles available per shift: 480 cycles (held at the documented default)
  • Tool acceptance-test uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Acceptance-test first-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross acceptance throughput capacity = acceptance throughput output per cycle × available acceptance throughput cycles.
  • Good acceptance throughput capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross acceptance throughput capacity works out to 1,920 units at these inputs.
  • Acceptance throughput downtime loss works out to 672 units at these inputs.
  • Acceptance throughput yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where tool acceptance-test uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • It computes good accepted capacity by multiplying output per cycle and available cycles into a gross capacity, then derating that gross figure by acceptance-test uptime and first-pass yield. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Good acceptance throughput capacity: 1,211 units (headline result)
  • Gross acceptance throughput capacity: 1,920 units
  • Acceptance throughput downtime loss: 672 units
  • Acceptance throughput yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Acceptance Throughput calculator, set tool acceptance-test uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.