1.5kW peak pulse in a DO-201 axial body
The 1.5KE27A-G is a 1500W (1.5kW) unidirectional TVS from Comchip Technology's 1.5KE-G series, housed in a DO-201AA (DO-27) axial-lead package.
Clamping voltage and breakdown margin
Reverse standoff is 23.1V typical — the rail voltage below which the diode is essentially non-conducting. Breakdown voltage starts at 25.65V minimum, so a 24V bus that sees a 26V transient begins to clamp before the surge reaches the protected load. The 37.5V clamp ceiling limits the voltage stress on downstream semiconductors. The DO-201 body with tin-plated copper leads handles the thermal pulse of a 1500W event without exceeding the junction rating.