1500 W pulse — what the ratings mean for the board
The 1.5KE22CH: At that pulse condition the clamping voltage holds at 31.9 V max while the device shunts 49 A of surge current — a 24 V nominal rail sees the clamp engage well below the downstream IC's abs-max rating. Reverse standoff voltage is 17.8 V, meaning the diode draws negligible leakage below that rail level. Breakdown is guaranteed between 19.8 V and the clamp threshold, so a 12 V or 15 V bus stays below the standoff during normal operation and the TVS only conducts when the transient exceeds the breakdown knee.
DO-201 axial — board-fit and procurement note
The DO-201AA (DO-27) axial-lead package is a through-hole form factor with a 0.052-inch diameter lead. It fits standard 1.0 mm drilled plated-through holes and is hand-solderable or wave-solderable. The bidirectional configuration means a single device clamps both polarities — no series arrangement needed — which saves one component and one hole pair per protected line.