1.5 kW surge clamp in a DO-214AB footprint
The 1.5SMC150A: It clamps a 128 V reverse standoff voltage to 207 V maximum at a peak pulse current of 7.3 A, protecting downstream circuitry from transients on a nominal 128 V rail. The 1500 W rating at the 10/1000 µs pulse defines the energy-handling capability for surge events like lightning-induced transients or inductive load switching. The 207 V clamp voltage ensures the protected circuit sees no more than that peak during the event, provided the PCB layout keeps the trace inductance low enough to avoid additional voltage overshoot.
Clamping parameters and temperature range
Breakdown voltage starts at a minimum of 143 V, giving a 15 V margin above the 128 V reverse standoff before the device begins conducting. The single unidirectional channel handles positive-going transients relative to ground. The peak pulse power derates above 25°C per the datasheet curve, so at 85°C ambient the effective surge capability is roughly 70% of the 1500 W rating.