1.5kW peak pulse clamp in the SMC footprint
The 1.5SMCJ45CA_R1_00001: The CA suffix marks the bidirectional polarity variant in the same SMC (DO-214AB) package as the rest of the 1.5SMCJ family, giving a known land pattern for drop-in replacement or cross-reference sourcing. Reverse standoff sits at 45 V typ — the circuit runs below this without the TVS conducting; anything above 50 V breakdown triggers the clamp. For a 24 V rail this gives roughly 2× headroom in normal operation and a defined clamping ceiling under surge.
-55 to 150°C junction — the temp grade tells you where it lives
The 150 °C maximum junction temperature and the -55 °C cold start are the relevant selection gate: this part is rated for industrial and automotive ambient bands without derating at the low end, and the thermal budget at the clamp event is set by the 150 °C ceiling, not the 85 °C commercial limit. The SMC package thermal impedance is the board-design constraint — the cathode tab carries the heat to the copper pad, so a adequate landing and via array under the tab determines whether the clamp repeats without walking up in temperature.