1.5kW peak pulse — what the clamping spec actually means
The 1500 W peak pulse rating (10/1000 µs waveform) defines the energy this part can absorb during a transient event without degradation. For a 24 VDC input rail, a unidirectional TVS like the 1.5SMCJ7.5C clamps the positive transients — the C suffix marks unidirectional polarity, not bidirectional — protecting downstream MOSFETs and regulators from voltage spikes that exceed the rail rating. The 14.3 V clamping ceiling sits safely below the gate-drive thresholds of most 30 V-rated MOSFETs used in synchronous buck converters.
DO-214AB SMC — the footprint that travels across families
The DO-214AB (SMC) package is the de facto standard for 1500 W unidirectional TVS diodes across multiple brands. The cathode bar on the package body identifies the polarity end — pin-compatible substitutes from other manufacturers sharing the same SMC footprint are common, which matters when a last-time-buy or shortage forces a cross-sourced swap.