The BZT55C2V4 from Micro Commercial Components is a Zener Diode with Zener Voltage 2.28 to 2.56 V, Zener Current 1 mA, Voltage Forward 1.5 V, Current 5 mA, Current Reverse Reverse Leakage Current:- <50 - <100 uA. More details for BZT55C2V4 can be seen below.