The BZT52C16T from Micro Commercial Components is a Zener Diode with Zener Voltage 15.3 to 17.1 V, Zener Current 1 mA, Voltage Forward 0.9 V, Current 5 mA, Current Reverse Reverse Leakage Current:- 0.1 uA. More details for BZT52C16T can be seen below.