110 V rail protection — breakdown and clamp thresholds
Its minimum breakdown voltage is 122 V, meaning it stays off below that and starts conducting only when the surge pushes the line past the normal operating ceiling. The clamping voltage is held to 177 V at the peak pulse current of 3.4 A — this is the voltage the protected circuit sees during a 10/1000 µs surge event.
600 W peak pulse — sizing against surge requirements
Rated for 600 W peak pulse power, this TVS handles moderate-energy transients typical of industrial power supplies and telecom line cards. The 3.4 A peak current is the current that flows through the diode at the clamp voltage.
The DO-214AA (SMB) package is a surface-mount footprint shared across the SMBJ family — the same pad layout works for 5 V to 188 V variants, simplifying PCB layout for multi-rail designs.