What the 1500W rating means for your rail
The 1.5SMC120AS_R1_00001: That rating tells you how much transient energy it can clamp before the junction fails — for a 102V rail, it shunts up to 9.1A of surge current to ground, holding the voltage to 165V max across the load. The reverse standoff voltage is 102V — this is the DC or peak-AC voltage the diode blocks without conducting. Above that, breakdown starts at 114V minimum, and the clamping action limits the spike to 165V. For a 102V nominal bus, the margin between operating voltage and breakdown is tight; a 5% tolerance on the rail puts it at 107V, still below the 114V breakdown floor.
Package and board-fit
Housed in a DO-214AB (SMC) surface-mount package, the same footprint used across the 1.5SMC series. The SMC body handles the 1500W pulse without cracking the epoxy — the copper leadframe and large die attach are sized for the thermal shock of a repetitive surge. The reel quantity is the standard 850 or 3000 per the SMC package convention.
An outdoor telecom rectifier or an engine-bay ECU sees ambient temperatures well within this band, and the junction can spike higher during the surge itself without immediate damage.