The DL85C18 from Micro Commercial Components is a Zener Diode with Zener Voltage 16.8 to 19.1 V, Zener Current 0.5 mA, Voltage Forward 1.0 V, Current 15 mA, Current Reverse Reverse Leakage Current:- <0.5 uA. More details for DL85C18 can be seen below.