What this TVS diode protects and where it goes
It clamps transients on a 20.5V nominal rail — the reverse standoff voltage — and can handle 600W peak pulse power (10/1000µs waveform) with a clamping voltage of 42.8V at the peak pulse current of 93A (8/20µs waveform).
This is the part you specify when the protection diode must survive the same reliability screening as the ECU's main microcontroller. The active lifecycle status means no last-time-buy risk for current production programs.
Package and footprint — DO-214AA SMB
The bidirectional configuration means a single device replaces two series-connected unidirectional TVS diodes, saving board area. No power line protection feature — this is a signal or low-power rail clamp, not a mains-side suppressor.