What the 1N6044A clamping voltage means for your rail protection
The 1N6044A clamps at 22.5V maximum when the peak pulse current hits 67A (10/1000µs waveform) — that is the voltage the downstream circuitry sees during a surge event, not the breakdown voltage. If your protected rail cannot tolerate a 22.5V transient, this part is not the right clamp.
Peak pulse power and temperature range
It is a bidirectional Zener TVS — one device clamps both polarities, saving a diode and board space compared to two unidirectional parts in anti-series.
The DO-13 through-hole package is a standard footprint; no special handling or moisture sensitivity level to manage on the assembly line.