Clamping voltage and the rail it protects
The 1.5KE30CBULK: Its 24.3V reverse standoff voltage means it sits across a 24V nominal rail without conducting leakage current, then clamps transients at 43.5V maximum — the protected downstream components must survive that ceiling.
Pulse current and junction temperature envelope
Peak pulse current is 34.5A into the 10/1000µs test waveform — the actual surge capacity varies with pulse duration per the exponential derating curve typical of this class. The junction temperature range spans -65°C to 175°C, so the part handles sustained ambient heat in enclosed power supplies or outdoor equipment without derating the standoff voltage. Power line protection is not built in — this is a general-purpose transient suppressor for signal or low-voltage DC rails, not a primary AC mains protector.
Package and board integration
Housed in a DO-201AA / DO-27 axial-lead package, the body is through-hole mounted with the cathode band marking the orientation for unidirectional use — but this is a bidirectional part, so polarity doesn't matter. The DO-201 footprint is standard across the 1.5KE family, making this a drop-in replacement for any 1.5KE30C variant in the same package.