26V rail protection — the rating that decides fit
Its 26V reverse standoff voltage means it sits across a 24V supply bus without conducting during normal operation — the 28.9V minimum breakdown gives a few volts of headroom before it starts to avalanche. When a surge hits, it clamps at 42.1V maximum while shunting 14.9A of peak pulse current on the standard 10/1000µs waveform.
DO-214AA SMB — field-swappable footprint
The package is large enough to hand-solder with a fine-tip iron if you are doing rework on a bench, and small enough to fit tight layouts. No special pad geometry needed — the usual SMB land pattern works.
No last-time-buy notice to track, no forced redesign for a drop-in replacement.