Transient suppressor for legacy board protection
The 1N6274ARL4G is a Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W (1.5kW) peak pulse power dissipation. It clamps transients at 18.2V maximum when the surge current hits, protecting downstream circuitry from overvoltage events.
Voltage thresholds and operating range
Reverse standoff voltage is 11.1V typical, meaning the part stays non-conductive below that level. Breakdown starts at a minimum of 12.4V, and clamping is guaranteed at 18.2V maximum — a tight window that limits the voltage spike seen by the load. Operating junction temperature spans -65°C to 175°C, covering extreme thermal environments like engine compartments or outdoor telecom cabinets without derating concerns.
Package and mounting for rework and retrofit
Housed in a DO-201AD axial through-hole package, the 1N6274ARL4G is suited for manual assembly or rework on existing boards. The axial leads allow easy insertion into plated through-holes without special tooling. The single unidirectional channel means this diode protects one polarity line — it is not a bidirectional device, so it cannot be used on AC lines or bipolar signal pairs without an external bridge.
Lifecycle status and sourcing reality
onsemi lists the 1N6274ARL4G as Obsolete. There is no official successor or cross-reference in the ledger, so any replacement must be selected based on the same 1.5kW peak pulse rating, 11.1V standoff, and DO-201AD footprint. Because the part is obsolete, sourcing is limited to existing distributor stock or broker channels. Availability and pricing are confirmed at quote time against the BOM quantity — no stock-holding claim is made here.