1.5 kW peak pulse in a DO-201 axial body
The 1.5KE27A A0G: The 23.1 V reverse standoff voltage means the diode stays transparent on a nominal 24 V rail, only clamping when a transient pushes the line above 25.7 V breakdown. At the full 42 A peak pulse current the voltage is held to 37.5 V maximum — a figure that defines the downstream component's voltage rating in the protection budget. The DO-201AA (DO-27) axial leaded package is a through-hole form factor suited for point-to-point wiring or PCB mounting where the lead bend radius and hole diameter follow the package drawing. The junction temperature range spans -55°C to 175°C, covering the full industrial and some military-temperature deployment envelopes without derating concerns at the rail voltage.
Clamping voltage and the protection margin
The 37.5 V clamping voltage at the rated 42 A peak pulse current sets the upper bound for the voltage stress a protected circuit sees. A downstream DC-DC converter or linear regulator with a 40 V absolute maximum input rating has roughly 2.5 V of headroom at the full surge current — marginal if the transient energy exceeds the 10/1000 µs waveform. The breakdown voltage is specified at 25.7 V minimum, meaning the device starts to avalanche and conduct at that threshold. The 1.5 kW peak pulse rating is the product of the clamping voltage and the peak pulse current at the specified waveform — the actual energy capability scales inversely with pulse duration per the datasheet's derating curve.