1500 W Zener TVS in DO-201 axial
The 1.5KE18A-B: Packaged in the DO-201AA / DO-27 axial-lead form factor (supplier device package DO-201), it is a through-hole mounted part intended for general-purpose circuit protection applications where a single unidirectional clamping element is needed across a DC rail or signal line.
Clamping voltage and pulse current
For a 15.3 V nominal rail, this provides a 10 V margin above the operating voltage before the TVS begins to conduct in avalanche. The 59.5 A peak pulse current rating (10/1000 µs) is the maximum non-repetitive surge the device can absorb at the clamping voltage. The 1500 W peak pulse power is the product of these two values and sets the energy-handling capability for a single transient event. The device is not rated for power line protection, meaning it is intended for secondary-side or signal-level transient suppression rather than primary AC mains clamping.
Obsolete — sourcing through independent channels
Diodes Incorporated lists the 1.5KE18A-B as obsolete. No official successor order code is recorded in the lifecycle data. The part is available through independent surplus and broker distribution channels, with quantities and pricing confirmed at the time of RFQ. For a BOM line that requires this exact clamping voltage and package, the DO-201 axial footprint is standard across the 1.5KE series from multiple manufacturers, but no pin-compatible direct replacement from Diodes Incorporated is documented. Each lot should be verified for date code and traceability when sourced outside the authorized channel.