Semiconductor Advanced Packaging & Test worked example

Burn-in Capacity at 99% expected burn-in oven uptime: a worked example

Push expected burn-in oven uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when burn-in capacity in semiconductor advanced packaging and test is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Burn-in devices loaded per oven cycle: 4 units / cycle (unchanged)
  • Available burn-in oven cycles: 480 cycles (unchanged)
  • Expected burn-in oven uptime: 99 % (raised for this scenario; the documented default is 90)
  • Expected burn-in first-pass yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross burn-in capacity = burn-in capacity output per cycle × available burn-in capacity cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good burn-in capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross burn-in capacity.
  • At this operating point the engine returns 19.2 units for burn-in capacity downtime loss.
  • At this operating point the engine returns 57.02 units for burn-in capacity yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where expected burn-in oven uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • It multiplies devices loaded per oven cycle by available cycles for gross capacity, then derates by oven uptime and post-burn-in first-pass yield to get good screened devices. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Good burn-in capacity: 1,844 units (headline result)
  • Gross burn-in capacity: 1,920 units
  • Burn-in capacity downtime loss: 19.2 units
  • Burn-in capacity yield loss: 57.02 units

Run it with your numbers

  • Every input above is editable in the live Burn-in Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.