40V standoff, 44.4V breakdown, 84V clamp — the three voltages that define protection
Breakdown occurs at a minimum of 44.4V, and the clamping voltage is held to 84V at the peak pulse current. That 84V let-through is what the downstream circuitry must survive. The single bidirectional channel protects both positive and negative surges, so one device replaces two unidirectional diodes in a back-to-back configuration.
400W peak pulse power in DO-214AC — surge rating vs footprint
Rated at 400W peak pulse power per the 10/1000µs waveform, with a peak pulse current of 27A under the 8/20µs shape. The DO-214AC (SMA) surface-mount package is the standard footprint for this power class — the same case used across the SMAJ family.
For a production BOM, this part carries no forced-migration risk.