The BZM55C2V0 from Micro Commercial Components is a Zener Diode with Zener Voltage 1.9 to 2.1 V, Zener Current 1.0 mA, Voltage Forward 1.5 V, Current 5.0 mA, Current Reverse Reverse Leakage Current:- 150 - 300 uA. More details for BZM55C2V0 can be seen below.