Implantable Electronics & Neurodevices worked example

Hermetic Seal Yield at 71% target hermetic seal yield: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target hermetic seal yield to 71%, then walk the calculation through step by step. Calculate the pass rate for implantable device hermetic packages after helium leak testing or seal inspection.

The inputs for this scenario

  • Hermetic packages passing leak test: 238 packages (held at the documented default)
  • Hermetic packages tested: 250 packages (held at the documented default)
  • Target hermetic seal yield: 71 % (the input this scenario stresses; the baseline uses 98)

Working through the calculation

  • The calculation starts from the formula this tool documents: Hermetic seal yield = hermetic packages passing leak test ÷ hermetic packages tested × 100.
  • Hermetic seal yield works out to 95.2 % at these inputs, and this is the headline figure for the scenario.
  • Hermetic seal yield gap to target works out to -24.2 points at these inputs.
  • Hermetic packages passing leak test works out to 238 count at these inputs.
  • Hermetic packages tested works out to 250 count at these inputs.

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 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target hermetic seal yield, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: -24.2 points
  • Hermetic packages passing leak test: 238 count
  • Hermetic packages tested: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Hermetic Seal Yield calculator, set target hermetic seal yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.