The 1.5SMCJ11: The 1500 W (1.5 kW) peak rating defines the surge energy the diode can absorb without degradation on a single-event basis — it is not a continuous power rating. For a 24 VDC input rail, the clamping ceiling of 20.1 V sits below the withstand voltage of most downstream ICs, so the part protects downstream components from inductive kickback and ESD events on that rail. The 74.6 A peak pulse current at the clamping voltage confirms the diode's surge-handling capability matches well against input lines that might see significant transient energy.
Active production status and sourcing posture
Diotec Semiconductor lists the 1.5SMCJ11 as Active.