The BZX55C12 R0G is a 500mW, 5%, small signal Zener Diode manufactured by Taiwan Semiconductor in a standard DO-35 package. It provides protection against voltage transients and protects other components from being damaged by reverse bias voltages. It has a Cathode Band Polarity Indicator. The device has a maximum reverse-breakdown voltage of 12V, a maximum power dissipation of 500mW and a maximum thermal resistance of 225°C/W. This diode is suited for use in many DC, AC, or pulsed applications.