Surge rating and rail protection fit
The 1.5KE12A-B is a 1500W peak pulse power Zener TVS diode from Diodes Incorporated, rated for a 10.2V reverse standoff voltage — this is the maximum DC voltage it can sit across without conducting in normal operation. The single unidirectional channel is intended for DC rail protection — a 12V bus, 12V battery line, or similar DC supply where the polarity is fixed.
Through-hole package and board-level integration
Housed in a DO-201AA (DO-27) axial-lead through-hole package, designated as DO-201 in the supplier device package field — this is a standard 5.0mm body diameter with 0.052-inch lead diameter, compatible with existing PCB layouts for 1.5kW TVS diodes in this form factor. Supplied in Bulk packaging (tube or loose tray), not tape-and-reel — a factor for pick-and-place planning if automated insertion is intended, though the axial leads typically require hand or wave soldering.
Obsolete — sourcing through surplus channels
For BOM lines that call out this exact order code, the only procurement path is through independent surplus and broker channels that hold end-of-life inventory. The base product number 1.5KE12 covers the family — if a design can tolerate a different breakdown or clamping voltage, other variants in the 1.5KE series may be active, but no pin-compatible drop-in replacement from Diodes Incorporated is listed.
Breakdown and clamping thresholds
The minimum breakdown voltage is 11.4V — the device starts conducting between 11.4V and the maximum clamping voltage of 16.7V, with the actual clamp level depending on the surge current amplitude. With no power line protection feature (per the spec field), this TVS is not rated for continuous overvoltage or fault ride-through — it is a transient-only suppressor designed for IEC 61000-4-5 surge events.