The BZX79B68 R0 part is a surface mount, discrete, unidirectional voltage regulator diode from Taiwan Semiconductor. This diode is rated to deliver up to 200mA of current at a maximum working voltage of 50V (with a maximum peak reverse voltage of 64V). It has a low temperature coefficient and a high surge capacity, making it ideal for use in a variety of applications including power supplies, linear regulators, high voltage protection circuits, and low voltage transients.