What this 1500W Zener TVS protects
The 1.5KE43CAH: It clamps a 26A surge to 59.3V maximum, with a 36.8V reverse standoff voltage that keeps the protected rail clear during normal operation.
Clamping voltage and breakdown margin
The minimum breakdown voltage is 40.9V, so a 36.8V nominal rail sees a 4.1V margin before the TVS starts conducting leakage current. The clamping voltage of 59.3V at the rated 26A peak pulse current tells you the worst-case voltage the downstream silicon sees during a surge event — a 48V bus or a 24V system with a 36.8V TVS has headroom for load-dump transients without exceeding the clamp ceiling.
Package and board integration
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE43CAH mounts through-hole — the lead bend and body length are standard for 1.5KE-series TVS diodes, so existing PCB footprints for this class accept it without layout changes. The axial body sits above the board, which helps with convective cooling during repetitive surge events.