1500 W peak pulse, 175 V standoff — the surge protection envelope
The 1.5KE220-E3/73: Its 175 V reverse standoff voltage means the protected rail can run at up to 175 V DC without the diode conducting in standby; the breakdown starts at 198 V min, and clamping is specified at 344 V max at the 4.4 A peak pulse current.
Through-hole DO-201AA — legacy footprint for replacement and repair
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE220-/73 mounts through hole. This is a standard footprint found on countless telecom, industrial, and power-supply boards — the replacement fits the same drilled holes and solder pads without a layout change.
Obsolete — sourced through independent channels
Vishay has marked the 1.5KE220-/73 as obsolete.
-55 to 175 °C — industrial and high-temp environments
The junction temperature range spans -55 to 175 °C, covering most industrial, automotive under-hood, and telecom outdoor cabinet conditions. The wide margin above 125 °C means the device handles self-heating during repetitive surge events without immediate derating.