Semiconductor Advanced Packaging & Test worked example

Die Attach Yield at 99% target die attach yield rate: a worked example

This scenario runs the die attach yield calculation on the strong side: 99% target die attach yield rate, with every other input held at its documented default. Use it when die attach yield in semiconductor advanced packaging and test needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Dies attached passing bondline inspection: 8 count (unchanged)
  • Total dies attempted at die-attach: 250 count (unchanged)
  • Target die attach yield rate: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Die attach yield rate = die attach yield count ÷ total die attach yield population × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for die attach yield rate, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for die attach yield gap to target.
  • At this operating point the engine returns 8 count for die attach yield count.
  • At this operating point the engine returns 250 count for total die attach yield population.

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 %.
  • Use it after each die-attach lot or process change to confirm dispense, placement, and cure are holding your yield budget. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Die attach yield rate: 3.2 % (headline result)
  • Die attach yield gap to target: 95.8 points
  • Die attach yield count: 8 count
  • Total die attach yield population: 250 count

Run it with your numbers

  • Every input above is editable in the live Die Attach Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.