The MMBZ5230C from Micro Commercial Components is a Zener Diode with Zener Voltage 4.61 to 4.79 V, Zener Current 20 to 0.25 mA, Voltage Forward 1.2 V, Current Reverse Leakage Current:- 5 uA, Power 300 mW. More details for MMBZ5230C can be seen below.
