The 1N4123 from Micro Commercial Components is a Zener Diode with Zener Voltage 37.05 to 40.95 V, Zener Current 9.8 mA, Voltage Forward 1.1 V, Current Reverse Reverse Leakage Current:- 0.01 uA, Power 500 mW. More details for 1N4123 can be seen below.