The 24V reverse standoff voltage means the part does not conduct at normal bus levels; the 26.7V minimum breakdown is where clamping begins, and the 50V maximum clamping at 46A peak pulse current sets the upper limit the protected circuitry must survive.
Bidirectional — one device protects both polarities
With a single bidirectional channel, this part clamps positive and negative transients symmetrically. That saves board space versus two unidirectional TVS diodes back-to-back, and it is the natural choice for AC-coupled signal lines, bipolar supplies, or any line where the transient polarity is unknown.
DO-214AC (SMA) — a standard footprint with wide second-source coverage
The SMAJ24CA-TR is supplied in the DO-214AC (SMA) surface-mount package, a widely used outline for 400W TVS diodes. The same footprint is shared across the SMAJ family and many competitors' 400W SMA parts, so PCB layout is straightforward and alternate sourcing is practical if supply tightens.
There is no last-time-buy window, no end-of-life notice, and no successor part to track.