Obsolete — last-time-buy sourcing
The 1.5KE350 is listed as Obsolete by Littelfuse, meaning the manufacturer has discontinued production with no scheduled last-time-buy window remaining. Available through independent surplus and broker channels.
1500W peak pulse — what the rating means
The device absorbs a single 3.2 A pulse (Ipp) at the clamping voltage of 506.1 V without failing. The 300 V reverse standoff voltage (working voltage) means the diode draws negligible leakage below that rail — it sits across a 300 VDC bus and stays invisible until a transient exceeds the 315 V minimum breakdown threshold.
DO-201 axial — board-fit note
Through-hole DO-201AA (DO-27) axial lead package. The body is rated for continuous junction temperatures from -55°C to 175°C, covering industrial and automotive under-hood thermal environments. Unidirectional — one channel per device. The cathode band marks the anode-to-ground orientation; reverse the leads and the diode clamps the negative transient instead.