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IPC-A-610 Class 2 vs Class 3 Selector
IPC-A-610 Class 2 vs Class 3 Selector
Class is fixed at the bare-board stage and can’t be “upgraded” by good assembly — so pick it up front. Class 3 is application-based, not aerospace-only.
Recommended build class
| Acceptance (IPC-A-610) | Class 2 | Class 3 |
|---|---|---|
| PTH barrel fill | 75% (50% w/ conditions) | 75%, no exception |
| Circumferential wetting | ≥180° | ≥270° |
| Barrel copper plating | 0.8 mil | 1.0 mil |
| Voids allowed | 1 in 5% of holes | None |
| Inspection | Visual + functional | + X-ray, cross-section, stress |
Thresholds per IPC-A-610 (Sierra Circuits, rev H). Class 3 boards are built to IPC-6012 plus the relevant addendum; cross-sections available on request.
