Clamping a 48V rail — what the 1.5 kW buys you
The 1.5SMC56AS_R1_00001: It clamps a transient on a 47.8 V nominal rail (the reverse standoff voltage) at 77 V maximum, handling 19.5 A of peak pulse current.
Package and board-fit — DO-214AB (SMC) footprint
The copper pad area under the cathode tab sets the junction-to-ambient thermal resistance — a solid pour on the PCB's top layer pulls heat from the 150°C-rated junction during repetitive surges. The unidirectional die means the cathode is the tab side; the anode is the opposite end.
The 1.5SMC56AS_R1_00001 is listed as Active by Panjit International Inc.