Protection window and surge capability
The 1.5KE51CA A0G is a bidirectional Zener-type TVS diode — it clamps transients of either polarity, making it a single-component solution for AC signal lines or bipolar DC rails where a unidirectional part would need two devices back-to-back. The reverse standoff voltage of 43.6V means the protected rail can run at up to that voltage without the diode conducting leakage current in normal operation. The minimum breakdown voltage of 48.5V defines where clamping begins, and the maximum clamping voltage of 70.1V at 22A peak pulse current (10/1000µs waveform) sets the highest voltage the downstream circuitry sees during a surge event.
Package, temperature range, and deployment context
Housed in a DO-201AA axial-lead package (also known as DO-27), the 1.5KE51CA A0G is a through-hole part suited for point-to-point wiring or PCB mounting where the leads are formed and soldered into plated holes. The axial body handles the thermal pulse of a 1500W surge without exceeding the 175°C maximum junction temperature. Note that power line protection is marked as 'No' — this TVS is intended for signal and DC rail transient suppression, not for continuous AC mains overvoltage clamping where a varistor or higher-energy MOV would be specified.
Sourcing and lifecycle posture
The base product number 1.5KE51 identifies the voltage family; this specific suffix (CA) denotes bidirectional polarity, and the A0G suffix indicates the Tape & Box packaging format.