What this 1500 W bidirectional TVS covers
The 1.5KE350CA-E3/73: With a 300 V reverse standoff voltage and a 333 V minimum breakdown, it clamps transients to 482 V maximum at the 3.1 A peak pulse current — sized for 300 VDC bus or 240 VAC line protection where the surge energy stays within the 1500 W envelope.
Obsolete — sourcing through independent channels
Vishay lists this part as obsolete. The DO-201AA axial footprint is common across the 1.5KE series, so a parametric cross to another 1500 W bidirectional 300 V standoff TVS in the same package is possible, but the replacement part number must be verified against the BOM's clamping and breakdown tolerance.
DO-201AA axial package and temperature range
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE350CA-/73 mounts through-hole on a PCB or terminal block. The junction temperature range spans -55°C to 175°C, covering industrial and telecom environments where the ambient sees wide thermal cycling. No power line protection feature is built in — this is a standalone transient clamp for signal or DC bus rails, not a mains-rated protector.