The 1N6280A-E3/73: The reverse standoff voltage of 20.5 V sets the working bias the diode sees during normal operation — transients above that level trigger avalanche breakdown at the 22.8 V minimum breakdown voltage and are absorbed as clamping energy rather than passed to the protected node.
TransZorb® Zener class — not a power-line protector
The 1.5KE supplier device package designation places this part in the TransZorb® family — Vishay's Zener-based transient voltage suppressor series. Notably, the spec table flags Power Line Protection as No, meaning this part is suited for board-level signal and rail protection rather than AC mains clamping. If the design intent is front-end mains protection, that distinction gates the BOM fit. Peak pulse capability is rated at the 10/1000 µs standard waveform — faster transients (ESD, EFT) absorb less total energy per event, so the clamping headroom holds even if the dv/dt is steep.
DO-201AA axial through-hole — board assembly note
The DO-201AA (DO-27) axial package mounts in standard through-hole fashion — the two leads insert into the PCB and are soldered, typically wave or hand. The Tape & Box packaging is the standard distribution format for this package type. Board spacing must accommodate the body diameter and lead bend radius for panel or rack assembly.