What this TVS clamps and where it fits
The SMCJ22CAQ-13-F: It clamps at 35.5 V max and handles 42.2 A peak pulse current, making it a first-choice clamp for a 22 V rail in an automotive ECU or sensor module.
Clamping voltage and pulse current — the real protection envelope
With a 22 V reverse standoff, the diode stays off on a nominal 24 V bus and only conducts when the transient exceeds the 24.4 V minimum breakdown. The 35.5 V max clamping means a downstream 40 V-rated DC-DC converter or sensor IC sees a peak well inside its abs-max rating. The 42.2 A peak pulse current is the current the diode can sink during the 10/1000 µs surge — match this to the expected surge impedance of the harness or the upstream fuse's I²t curve. The DO-214AB (SMC) package is the standard footprint for a 1500 W TVS — the copper pad area on the PCB sets the thermal impedance for repetitive pulses. The -55 °C to 150 °C junction range covers the full automotive temperature envelope with margin for self-heating during a surge.
Active production and sourcing posture
The base product number SMCJ22 covers the family — the full suffix includes the bidirectional (CA) and automotive (Q) variants.