Implantable Electronics & Neurodevices worked example

Hermetic Seal Yield at 99% target hermetic seal yield: a worked example

What does the result look like when target hermetic seal yield reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when quality or process engineering needs to compare hermetic package seal results against the release target for a pacemaker, neurostimulator, sensor, or feedthrough lot.

The inputs for this scenario

  • Hermetic packages passing leak test: 238 packages (unchanged)
  • Hermetic packages tested: 250 packages (unchanged)
  • Target hermetic seal yield: 99 % (raised for this scenario; the documented default is 98)

Working through the calculation

  • Applying the documented formula (Hermetic seal yield = hermetic packages passing leak test ÷ hermetic packages tested × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 95.2 % for hermetic seal yield, the number this scenario is built around.
  • At this operating point the engine returns 3.8 points for hermetic seal yield gap to target.
  • At this operating point the engine returns 238 count for hermetic packages passing leak test.
  • At this operating point the engine returns 250 count for hermetic packages tested.

How this compares with the baseline

  • Against the tool's baseline example, where target hermetic seal yield sits at 98% and the headline result is 95.2 %, this scenario lands almost exactly on the baseline at 95.2 %.
  • A figure at this level is achievable when target hermetic seal yield is genuinely sustained, not just peaked for a shift. Pass/fail leak-test yield does not capture marginal seals that pass today but may degrade, so it should be read alongside leak-rate distribution and aging data.

Results at a glance

  • Hermetic seal yield: 95.2 % (headline result)
  • Hermetic seal yield gap to target: 3.8 points
  • Hermetic packages passing leak test: 238 count
  • Hermetic packages tested: 250 count

Run it with your numbers

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

Last reviewed 2026-05-12.