The 1.5KE170A is part of the Diode, an electronic component used to pass electric current in one direction. It is a single-phase, silicon avalanche rectifier, which is designed to withstand high working voltage, up to 1600V, and can pass currents up to 1.5A. It is a DO-201AD-packaged component with two leads, a cathode and an anode. The component has an extremely low forward voltage drop, making it a suitable option for use in a wide variety of applications, including power supplies, switch mode power supplies, radio transceivers, and audio amplifiers.