The MMSZ4680 from Micro Commercial Components is a Zener Diode with Zener Voltage 2.2 to 2.31 V, Zener Current 50 mA(zener test current), Voltage Forward 0.95 V, Current Reverse Leakage Current:- 5 uA, Power 500 mW. More details for MMSZ4680 can be seen below.