The BZX84C43 from Micro Commercial Components is a Zener Diode with Zener Voltage 40.85 to 45.15 V, Zener Current 5 mA, Voltage Forward 0.9 V, Current 1 mA, Current Reverse Reverse Leakage Current:- 0.1 µA. More details for BZX84C43 can be seen below.