The 1.5SMCJ15: 1500 W peak pulse rating defines the device as a mid-range TVS in the SMC/DO-214AB form factor, meaning it absorbs a 10/1000 µs transient without degradation provided the pulse energy stays within the 1.5 kW ceiling — the matching 55.8 A peak pulse current and 26.9 V clamping ceiling at that current tell you the protection window is tight and predictable for board-level transient suppression.
Standoff, breakdown, clamping — the protection window
15 V reverse standoff is the working voltage — the diode sits idle below this level and activates only when the line spikes above the 16.7 V minimum breakdown threshold, clamping at 26.9 V maximum to protect downstream circuitry.
Active production, no successor on record
Confirm the BOM position count and the mating half before committing — the SMC/DO-214AB package is industry-standard, so second-source candidates in the same footprint are worth evaluating at RFQ for single-source risk mitigation.