Clamping and breakdown thresholds
The 1.5KE18ARL4G: The 15.3V reverse standoff means the diode stays in high-impedance below that rail voltage, making it suitable for protecting 12V or 15V DC buses where the normal operating voltage stays under the standoff threshold. Operating temperature spans -65°C to 175°C junction, covering the full industrial and military temperature envelope without derating concerns in most environments.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE18ARL4G as obsolete. No official successor order code is recorded in the lifecycle data. Sourcing runs through independent surplus and broker channels — quantities are lot-specific, and availability is confirmed at the time of RFQ against the BOM line.