Semiconductor Fab Equipment Manufacturing worked example

Test Stand Capacity at 65% test stand uptime availability: a worked example in semiconductor fab equipment manufacturing

This worked example runs the test stand capacity numbers for a tougher week than the baseline: 65% test stand uptime availability instead of the typical 90%. Estimate test stand capacity 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

  • Units tested per stand cycle: 4 units / cycle (held at the documented default)
  • Available test stand cycles per period: 480 cycles (held at the documented default)
  • Test stand uptime availability: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass test yield: 97 % (held at the documented default)

Working through the calculation

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

How this compares with the baseline

  • Against the tool's baseline example, where test stand uptime availability sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • Use it when sizing a test cell for a build plan, committing a ship date off a test bottleneck, or justifying a second stand versus an uptime/yield improvement. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Good test stand capacity: 1,211 units (headline result)
  • Gross test stand capacity: 1,920 units
  • Test stand capacity downtime loss: 672 units
  • Test stand capacity yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Test Stand Capacity calculator, set test stand uptime availability to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.