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IPC-6012 Class 2 vs Class 3 Selector
Your build class is locked before fabrication and cannot be upgraded afterward. Pick your end market to see the right class and what changes on the board.
| Acceptance criterion | Class 2 | Class 3 |
|---|---|---|
| PTH wall copper (avg) | 20 µm | 25 µm |
| Min external annular ring | 50 µm | 50 µm (no 90° breakout) |
| Barrel solder fill | ≥50% | ≥75% |
| Max conductor-width reduction | 30% | 20% |
Thermal stress test for both: 288 °C / 10 s (IPC-6012 §3.6.1). PCBark builds to IPC-6012F Class 2 and Class 3, with automotive (IPC-6012EA) and medical (EM) addenda available.
Confirm your build class with PCBark →
