Semiconductor Advanced Packaging & Test worked example

Die Attach Yield at 68% target die attach yield rate: a worked example

Suppose target die attach yield rate falls to 68%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate die attach yield for semiconductor advanced packaging and test using production-ready inputs so teams can track KPI performance and decide whether corrective action is needed.

The inputs for this scenario

  • Dies attached passing bondline inspection: 8 count (held at the documented default)
  • Total dies attempted at die-attach: 250 count (held at the documented default)
  • Target die attach yield rate: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Die attach yield rate = die attach yield count ÷ total die attach yield population × 100.
  • Die attach yield rate works out to 3.2 % at these inputs, and this is the headline figure for the scenario.
  • Die attach yield gap to target works out to 64.8 points at these inputs.
  • Die attach yield count works out to 8 count at these inputs.
  • Total die attach yield population works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target die attach yield rate sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • It computes the percentage of dies that pass die-attach inspection out of all attempted, plus the point gap above or below your target. 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

  • Die attach yield rate: 3.2 % (headline result)
  • Die attach yield gap to target: 64.8 points
  • Die attach yield count: 8 count
  • Total die attach yield population: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Die Attach Yield calculator, set target die attach yield rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.