What the 1500W peak pulse rating means on a telecom board
The 1.5SMC18CA V7G: At 60 A peak pulse current the voltage clamps at 25.5 V max, which keeps the downstream rail below the absolute maximum of a 24 V telecom line card or a 15 V DC-DC converter input. The 15.3 V reverse standoff voltage means the diode stays transparent on a nominal 12 V or 15 V bus — it only conducts when a surge pushes the line above the 17.1 V minimum breakdown threshold. That guard band between standoff and breakdown absorbs normal rail ripple without leakage.
Package and board-level integration
The bidirectional configuration (one chip, two Zener junctions back-to-back) clamps both polarities with a single DO-214AB footprint — saves board space compared to two unidirectional diodes in anti-series.