110 V rail protection — clamping at 177 V
Its reverse standoff voltage is 110 V typ, and it clamps at 177 V max at the 8.4 A peak pulse current (10/1000 µs waveform). The 1.5 kW peak pulse power rating (10/1000 µs) gives the designer a surge budget for industrial power supplies, telecom rectifiers, and general-purpose DC rail protection where the operating temperature range spans -65°C to 150°C junction.
Minimum breakdown voltage is 122 V, so the TVS starts conducting at that threshold. The 177 V clamping ceiling is the voltage the protected circuitry sees under the rated surge — a key input for downstream MOSFET Vds or capacitor voltage rating selection. The 8.4 A peak pulse current is the current the device can sink during the 10/1000 µs pulse. For a given transient energy, a lower clamping voltage means higher peak current; this part is sized for moderate-energy surges on 110 V rails. Power line protection is not specified — this is a general-purpose TVS, not a dedicated AC mains protector. Use it on DC buses, signal lines, or low-frequency AC where the waveform is well-defined.
Microchip lists the SMCJ110AE3/TR13 as Active.