1.5 kW unidirectional TVS in DO-214AB
The 1.5SMCJ54A: The reverse standoff voltage is 54 V typ — the working voltage the diode blocks in normal operation. Minimum breakdown is 60 V, and the clamping voltage ceiling is 87.1 V at the 17.2 A peak pulse current. That 87.1 V clamping floor is the key spec: when a transient exceeds the standoff, the TVS clamps the line at or below that voltage to protect downstream circuitry. Operating junction temperature runs from -50 °C to 150 °C — the upper bound matters for designs where the TVS sits near a heat source or in an enclosed space without active cooling. The SMC body thermal resistance and the 150 °C TJ limit constrain how long the part can absorb repeated transients above standoff; the 1500 W rating is a 10/1000 µs pulse rating, not a continuous dissipation figure.
Surface-mount fit for board-level protection
The SMC (DO-214AB) package is the standard industry footprint for 1500 W TVS diodes — the cathodes band on the body marks pin 1. For layout, the PCB copper area under the cathode pad sets the thermal path to the board; adequate pad size and thermal vias are required to stay within the TJ rating on repeated surge events. This is surface-mount only — no through-hole variant in this series.
Active production and sourcing
The 1.5SMCJ54A is listed Active by Diotec Semiconductor. This is a widely cloned series across multiple manufacturers — the 1.5SMCJ54A type code is a generic industry pinout, so second-source options exist. Confirm the exact diode variant and datasheet revision against the Diotec source before committing to a BOM position.