What this TVS diode does for your rail
Its 1.5kW peak pulse power rating (10/1000µs waveform) means it can absorb a 25.2A surge before the clamping voltage hits 59V — enough to protect a 24V or 28V DC bus in industrial or telecom gear without sacrificing board space.
The minimum breakdown voltage is 36.7V, which gives a 3.7V guard band above the 33V reverse standoff. That margin keeps the diode out of conduction during normal rail ripple while still triggering fast enough to clip a transient before it reaches the downstream silicon. The 59V maximum clamping point at 25.2A is the ceiling the load sees — confirm your downstream components are rated for at least that peak.
Microchip lists the SMCJ33E3/TR13 as Active, so it remains a current-design choice with no announced end-of-life.
The DO-214AB (SMC) package is a surface-mount footprint common in power-supply and I/O protection stages. No power line protection feature — this is a signal or low-voltage bus protector, not a mains-side device.