Standoff voltage — what 220V means for rail protection
The 1.5SMCJ220CA_R1_00001: The 220V reverse standoff typ is the selection anchor — this TVS sits on rails that must not clamp during normal operation but must snap into conduction above that threshold. The 242V minimum breakdown confirms the device stays off at 220V with margin, while the 356V maximum clamping at 4.2A peak pulse sets the max let-through voltage the protected load sees during a transient event.
The 4.2A peak pulse current at that wave shape is the usable headroom — if the fault current exceeds 4.2A at 356V clamping, the device thermally limits rather than clamps harder.
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