The Panjit 1.5SMC180A_R1_00001 is a 1500 W (1.5 kW) Zener TVS diode in the standard DO-214AB (SMC) surface-mount package. It clamps transients at 246 V maximum while holding a 154 V reverse standoff voltage, meaning a 154 V rail sees no leakage under normal operation and the TVS only conducts when the line exceeds the 171 V minimum breakdown threshold.
Clamping voltage and breakdown margin
That margin protects downstream semiconductors rated for 250 V or higher from overvoltage stress during surge events. The single unidirectional channel handles positive-going transients on a DC bus.
Temperature range and package fit
The DO-214AB (SMC) package uses standard reflow profiles and mates with common PCB footprints for high-power TVS diodes.