The MMSZ4681 from Micro Commercial Components is a Zener Diode with Zener Voltage 2.4 to 2.52 V, Zener Current 50 mA(zener test current), Voltage Forward 0.95 V, Current Reverse Leakage Current:- 2 uA, Power 500 mW. More details for MMSZ4681 can be seen below.