Its 10.2 V reverse standoff voltage means the protected rail can carry up to that level without the device conducting, while the 11.4 V minimum breakdown voltage guarantees the clamping action starts before the rail sees damaging overvoltage. The 21.7 V maximum clamping at the rated peak pulse current of 184 A (8/20 µs waveform) defines the worst-case voltage the downstream circuitry must survive. With a single bidirectional channel, this part handles both positive and negative surges on one line, saving board space versus two unidirectional diodes.
Package and mounting — DO-214AA (SMB) surface-mount
The SMB footprint is widely used for TVS diodes in this power class, and the package's small body keeps board area low.