What this TVS diode clamps and where it fits
The 110V reverse standoff means it sits across a 110V rail and stays transparent until the transient arrives. This is a general-purpose protection diode in the SMB (DO-214AA) package, surface-mount, intended for PCB-level clamping on power buses, telecom lines, or industrial DC rails where a single bidirectional device replaces two unidirectional TVS diodes in series.
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