What the 1500W rating means for your protection design
The 1.5KE220A-T: That 1500W figure is the maximum power the device can absorb in a single pulse — it does not mean continuous dissipation. The reverse standoff voltage of 185V means the diode draws negligible leakage below that level; the breakdown voltage range (209V min) is where it starts conducting.
Obsolete — sourcing reality for the 1.5KE220A-T
Diodes Incorporated lists the 1.5KE220A-T as obsolete. For a BOM that already uses this TVS, the through-hole DO-201AA/DO-27 axial package (also called DO-201) is a standard footprint. If a board spin is acceptable, a functional replacement from the same 1.5KE family with a different standoff voltage may be considered, but the 1.5KE220A-T itself is the exact order code for the 185V standoff / 328V clamp specification.
Temperature range and package fit
The through-hole axial package (DO-201) is hand-solderable and fits standard 0.100-inch pitch prototyping boards, but for production runs the Tape & Reel packaging supports automated insertion. Power line protection is marked 'No' — this TVS is intended for DC rail protection, not AC mains. The unidirectional channel (one) means it clamps only one polarity; for AC or bidirectional protection, a pair would be needed back-to-back.