22V rail clamp in a DO-214AB footprint
Its 22V reverse standoff (typ) means it sits across the line without conducting until the surge arrives, then clamps at 39.4V max (at 38.1A peak pulse current) to shunt the energy away from the load.
The 150°C ceiling is the same as many high-reliability parts, so you can share the thermal budget with a hot regulator or motor driver on the same board. The part is surface-mount (SMCJ22CE3/TR13) and supplied on Tape & Reel, which aligns with high-volume pick-and-place assembly. No power-line protection feature is claimed, so it is intended for signal or low-voltage DC rail clamping, not mains-side MOV replacement.
The base product number is SMCJ22, which means the die and package are a standard catalog item, so supply continuity is typical for an active Microchip TVS line.