The MM3Z5V6T1G is a Zener diode manufactured by ON Semiconductor. It is a 400 mW small signal diode with a voltage rating of 5.6V. This diode is designed for general purpose switching, voltage regulation, and waveform protection applications, such as voltage and power line protection of microcontrollers and other vulnerable components. It is designed to reduce the EMI caused by transients, and to reduce the risk of overvoltage failure due to power surges or wide voltage fluctuations. The package is in the SOT-23 form factor, and has a maximum operating temperature of +125°C.