Power Electronics, Motors & Drives worked example

Power Module First-Pass Yield at 68% target module yield: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target module yield to 68%, then walk the calculation through step by step. Calculate first-pass yield for IGBT, MOSFET, SiC, GaN, or diode power modules from passed modules, total tested modules, and the target yield.

The inputs for this scenario

  • Power modules passed first time: 8 modules (held at the documented default)
  • Total power modules tested: 250 modules (held at the documented default)
  • Target module yield: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Power module first-pass yield = power modules passed first time ÷ total power modules tested × 100.
  • Power module first-pass yield works out to 3.2 % at these inputs, and this is the headline figure for the scenario.
  • Module yield gap to target works out to 64.8 points at these inputs.
  • Power modules passed first time works out to 8 count at these inputs.
  • Total power modules tested works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target module yield sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target module yield, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. First-pass yield alone does not distinguish a systemic process shift from a sampling artifact — a small tested count, like the 250 here, makes the percentage swing sharply on a handful of fails.

Results at a glance

  • Power module first-pass yield: 3.2 % (headline result)
  • Module yield gap to target: 64.8 points
  • Power modules passed first time: 8 count
  • Total power modules tested: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Power Module First-Pass Yield calculator, set target module yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.