Clamping voltage and standoff margin
The 1.5SMC150CA-E3/9AT: The breakdown voltage range starts at 143 V, and the clamp is held to 207 V — the downstream circuitry must survive that peak without avalanche or latch-up. The single bidirectional channel handles both positive and negative transients in one package, simplifying board layout for symmetrical signal or power lines.
DO-214AB SMC footprint and temperature range
Housed in the DO-214AB (SMC) package, the device is surface-mount and occupies a standard footprint shared with many 1500 W TVS diodes.