Transient protection for 38.8 V rails — 500 W peak pulse, bidirectional
The 1N6123A: The single bidirectional channel means it clamps both polarities symmetrically — useful for AC-coupled signal lines or bipolar supply rails where a unidirectional part would leave one half-cycle unprotected.
Clamping voltage and breakdown window — sizing the protection margin
The minimum breakdown voltage is 48.5 V, and the maximum clamping voltage is 70.1 V at the rated peak pulse current.
Active production — no obsolescence risk for new designs
The Axial (B, Axial) through-hole package is a standard leaded form factor that mates with legacy PCB layouts and is straightforward to hand-assemble or wave-solder. No official second-source or successor is listed on the record, but the 1N6123A base number is shared across the family, so a same-function sibling with a different clamping voltage (e.g., 1N6123A vs 1N6123) would share the same footprint.