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SPC for IZ Window: 6 steps
- Define IZ CTQs (impedance drift metric, bonded-area %, edge integrity).
- Instrument J/C parameters + environment logs.
- Set Cp/Cpk targets for parameters and IZ outputs.
- Tag excursions in real time.
- Daily difference-in-risk vs non-excursion lots.
- Tie SPC to acceptance (PPAP / CTQ-warranty language).