400W peak pulse, 33V rail — signal-line transient clamp
The SMAJ33CA-13-F: The clamping voltage is 53.3V maximum at the 7.5A peak pulse current (10/1000µs waveform). That 53.3V ceiling is what the protected downstream circuitry sees during a surge — a figure to check against the absolute-maximum ratings of the ICs on that rail. This is a signal-line protector, not a mains-power device — the spec explicitly notes no power line protection.
DO-214AC SMA package — rework and board-fit
Housed in the standard DO-214AC (SMA) surface-mount package, the SMAJ33CA-13-F uses the familiar JEDEC footprint with the cathode band as the polarity mark — though for a bidirectional device, orientation does not matter for the clamping function. The SMA body is small enough to fit under a hot-air nozzle without heating adjacent parts, and the solder pads are wide enough that a standard iron tip can touch up a joint if needed.