The BZX584B30 from Micro Commercial Components is a Zener Diode with Zener Voltage 29.4 to 30.6 V, Zener Current 2 mA, Voltage Forward 0.9 V, Current 0.5 mA, Current Reverse Reverse Leakage Current:- 0.1 uA. More details for BZX584B30 can be seen below.