What this Zener TVS diode is and where it fits
The 1N6271A is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500 W peak pulse power at 10/1000 µs waveform. It clamps at 14.5 V maximum with a reverse standoff of 8.55 V, protecting downstream circuitry from voltage transients in general-purpose applications. Housed in a DO-201AD axial leaded package, it mounts through-hole — the same footprint as the industry-standard 1.5KE series, making it a drop-in replacement for many 1500 W axial TVS parts in legacy designs.
Sourcing this obsolete part — what to expect
onsemi lists the 1N6271A as Obsolete. No official successor is recorded in the available documentation, so the BOM line needs a cross-reference or a last-time-buy strategy if stock is still needed for production or repair.
Package and temperature range for repair fit
The DO-201AD axial package is the same body size as the 1.5KE series — 9.1 mm body length, 1.3 mm lead diameter — so it fits existing through-hole pads on boards designed for that footprint. Operating temperature spans -65°C to 175°C junction, covering industrial and automotive under-hood environments.