The BZX584B5V6 from Micro Commercial Components is a Zener Diode with Zener Voltage 5.49 to 5.71 V, Zener Current 5 mA, Voltage Forward 0.9 V, Current 1 mA, Current Reverse Reverse Leakage Current:- 1 uA. More details for BZX584B5V6 can be seen below.