The 1N4738A is a Zener Diode, manufactured by DC Components, with a power rating of 1 Watts and a nominal Zener breakdown voltage of 8.2 Volts. It is a single, DO-41 type diode, with a minimum zener impedance of 10 microamps, and a maximum forward voltage of 1.2 Volts. It is suitable for use in a wide variety of AC/DC power supply, over-voltage protection, and voltage reference applications, among others.