The STMicroelectronics 1.5KE400CARL is a bidirectional TRANSIL™ TVS diode from the 1.5KE series, designed to clamp transients on AC or DC power rails up to 342V nominal. Its minimum breakdown voltage of 380V and maximum clamping of 706V at the peak pulse current define the protection threshold: the rail must stay below 342V during normal operation, and the clamping voltage sets the upper limit the downstream components must survive. With a single bidirectional channel, it clamps both polarities — useful for AC lines or DC rails where reverse polarity protection is needed.
Through-hole axial — mounting and footprint
The DO-201AA / DO-27 axial package is a through-hole form factor with wire leads, intended for hand insertion or wave solder. The axial body suits point-to-point wiring on terminal strips or perforated boards as well as PCB mounting.