Transient protection for a 13.6 V DC rail
The 1.5SMC16A_R1_00001: Its 22.5 V maximum clamping voltage at 67 A peak pulse current (10/1000 µs waveform) means a downstream 24 V-rated IC sees a safe voltage during a surge event — the clamp engages before the silicon fails. The 15.2 V minimum breakdown voltage ensures the device stays off during normal operation at 13.6 V, but triggers reliably when a transient pushes the rail above that threshold. This is a unidirectional part — one channel, cathode to the protected rail, anode to ground.
Housed in a DO-214AB (SMC) surface-mount package, the same footprint as the supplier device package designation SMC (DO-214AB). The large tab on the bottom side carries the cathode current — the PCB copper pad area under the package sets the thermal impedance for the 1500 W pulse. A standard SMC footprint with adequate thermal vias handles the 10/1000 µs surge without exceeding the 150 °C junction temperature limit. No power line protection feature — this is a signal or low-voltage DC rail clamp, not a mains-side suppressor.