5V standoff, 500W peak pulse – DO-214AC Zener TVS
Its 5V reverse standoff voltage means it stays off the line until the surge exceeds that threshold, then it clamps at 9.6V max to protect downstream circuitry. The 500W peak pulse power rating at 10/1000µs waveform gives you the energy budget for common industrial surge events.
Unidirectional clamping in a standard SMA footprint
This device protects one polarity only (unidirectional,) – the cathode band marks the protected rail, anode to ground. The DO-214AC (SMA) package is a widely used surface-mount outline; the same footprint serves many TVS families, so swapping in a different voltage rating or a bidirectional variant (like SMAJ5.0CA) requires no board change. The 52A peak pulse current at the 10/1000µs waveform tells you the surge current the part can sink before the clamp voltage rises above 9.6V.