1500 W peak pulse, 36.8 V standoff — the clamping envelope for 24 V automotive rails
The 1.5KE43AHE3/51: Its 36.8 V reverse standoff voltage sits above the steady-state rail, while the 40.9 V minimum breakdown and 59.3 V maximum clamping at 25.3 A define the protection window — a 24 V system sees a clamped surge held under 60 V, keeping downstream electronics within their safe operating area.
Obsolete — sourced through surplus and broker channels
Vishay has marked the 1.5KE43AHE3/51 as obsolete. A functional replacement requires a parametric search for a 1500 W, 36.8 V standoff TVS in a DO-201AA package; no pin-compatible direct drop-in is guaranteed without verifying the clamping curve and AEC-Q101 grade.