Over-voltage at an input

What it checks

Every input pin declares the voltage range it tolerates. This check follows each net to its worst-case voltage — including ranges like a 9–18 V wall supply — and compares it against every pin the net touches.

Why it matters

Over-voltage is the classic instant kill. Exceed a pin's absolute maximum and the input protection clamps, overheats, and fails — sometimes immediately, sometimes weeks later in the field. The worst case matters because supplies sit at the top of their range exactly when you least expect it.

How to fix it

Put a regulator between the source and the pin, pick a part rated for the full source range, or — if the source genuinely never reaches the flagged voltage — declare its real range so the check works with the truth.

Related checks