1500 W clamping margin for 145 V rails
The 1.5SMC170A-E3/9AT: This Zener TVS diode clamps transients on a 145 V nominal rail — the reverse standoff voltage sits below the rail's maximum operating level so the diode stays out of conduction during normal bias, then triggers at 162 V breakdown to shunt the surge before it reaches 234 V.
DO-214AB footprint and temperature range
The DO-214AB (SMC) package is the standard surface-mount footprint for this power class — the same land pattern serves the Vishay SMCJ series, so a single PCB layout covers multiple voltage variants. Rated for -65 °C to 150 °C junction temperature, the diode handles the thermal pulse of a clamped surge without derating in most industrial and telecom environments.