Clamping performance and pulse handling
The 1.5SMC56A: This is the figure that matters for downstream component stress — a 48 V rail protected by this TVS sees the transient clipped to 77 V, well within the 100 V rating of typical downstream DC-DC converters and input capacitors. The single unidirectional channel handles positive-going surges; for bidirectional protection on an AC or bipolar rail, a pair back-to-back is needed.
Temperature range and soldering reality
The DO-214AB (SMC) footprint is standard — the cathode band and package outline match the industry-standard SMCJ land pattern, so the PCB layout is interchangeable with other 1.5SMC-series parts.