1.5KE30C-B — Obsolete 1500W Bidirectional TVS in DO-201
The Littelfuse 1.5KE30C-B is a 1500W (1.5kW) bidirectional TVS Zener diode, now marked as Obsolete per the manufacturer's lifecycle status. This part is the bidirectional variant of the 1.5KE series, offering a single bidirectional channel for symmetrical clamping of voltage transients on a signal or power rail. For a 24V nominal rail, the 25.6V standoff provides headroom while the 27V breakdown ensures the device triggers before the downstream circuitry sees damaging overvoltage.
DO-201 axial package and thermal rating
Housed in a DO-201AA (DO-27) axial-lead through-hole package, the 1.5KE30C-B is suited for point-to-point wiring or PCB mounting where a robust, solderable joint is required. The operating junction temperature range spans -55°C to 175°C, covering industrial and automotive under-hood thermal environments without derating the peak pulse power at the upper end. This rating assumes the diode is soldered into a typical copper trace on a standard PCB; the actual surge capability in a real layout depends on the thermal impedance of the board and ambient temperature. The 36.7A peak pulse current at the clamping voltage confirms the diode can absorb substantial surge energy from inductive load switching or lightning-induced transients on a 24V bus.
Sourcing an obsolete TVS diode
The 1.5KE30C-B is officially classified as Obsolete by Littelfuse. This means the manufacturer has ceased production and no last-time-buy (LTB) window remains open. The part is no longer available through standard authorized distribution channels. Procurement for this part now relies on independent surplus and broker channels. The DO-201 package and 1.5KE series are widely used, so inventory from date-code-locked lots is typically available for spot buys. Availability and pricing are confirmed at the time of RFQ against the specific BOM quantity and required date-code range.