1.5SMCJ20 — 1500W unidirectional TVS selection brief
Rated as a generic type, it protects against ESD, lightning, and inductive load transients rather than dedicated power-line protection. The 20V reverse standoff (typ) sets the working voltage above which the device begins to clamp — the 22.2 V minimum breakdown is the turn-on threshold. At 41.9A peak pulse current the clamping voltage is held to 35.8V max, which defines the protected-side voltage ceiling the downstream circuit sees during a surge event. Surface-mount DO-214AB fits the standard reflow profile and is compatible with standard pick-and-place — the SMC landing pad on the board is the thermal return path for pulse dissipation, not the housing itself.