The 1N4124 from Micro Commercial Components is a Zener Diode with Zener Voltage 40.85 to 45.15 V, Zener Current 8.9 mA, Voltage Forward 1.1 V, Current Reverse Reverse Leakage Current:- 0.01 uA, Power 500 mW. More details for 1N4124 can be seen below.