What this Zener TVS protects and where it fits
The 1.5KE8.2ARL4 is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power (10/1000µs waveform). It clamps transients at 12.1V maximum, with a reverse standoff of 7.02V — meaning it stays out of the way below that voltage and only conducts when a surge pushes above the 7.79V breakdown threshold. That makes it a fit for protecting 5V and 3.3V rails from lightning, inductive kickback, or ESD events in general-purpose equipment.
Obsolete — sourcing path and replacement
onsemi has marked the 1.5KE8.2ARL4 as Obsolete. That means no further production runs are planned. For a BOM line that still needs this exact order code, the only path is a last-time buy from remaining distributor inventory or the spot market. We can source it per RFQ — confirm the quantity and we'll check our network. For a production alternative, onsemi's 1.5KE series includes electrically equivalent parts in the same footprint.
Temperature range and mounting
The operating junction temperature spans -65°C to 175°C, so this diode can sit in an engine bay, outdoor telecom cabinet, or industrial control panel without thermal derating concerns. It's a through-hole axial part in a DO-201AD package — hand-solderable, breadboard-friendly, and easy to replace during rework. No power line protection built in; it's a straight transient suppressor for signal and low-voltage DC rails.