The MMBZ5261C from Micro Commercial Components is a Zener Diode with Zener Voltage 46.06 to 47.94 V, Zener Current 2.7 to 0.25 mA, Voltage Forward 1.2 V, Current Reverse Leakage Current:- 0.1 uA, Power 300 mW. More details for MMBZ5261C can be seen below.