The BZM55C2V4 from Micro Commercial Components is a Zener Diode with Zener Voltage 2.28 to 2.56 V, Zener Current 1.0 mA, Voltage Forward 1.5 V, Current 5.0 mA, Current Reverse Reverse Leakage Current:- 50 - 100 uA. More details for BZM55C2V4 can be seen below.