Peak pulse power and clamping for transient protection
The 1.5KE43CA: This is the energy-handling figure that determines whether the diode survives a lightning surge or inductive load dump on a 36.8V rail. The 59.3V clamp is the voltage the downstream device sees during the transient — it must stay within the absolute maximum rating of the protected IC.
Package, temperature range, and lifecycle
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE43CA is a through-hole part suited for point-to-point wiring or PCB mounting with a 0.100-inch lead spacing. The junction operates from -55°C to 175°C, covering industrial and automotive under-hood ambient ranges.