The BZT52C27T from Micro Commercial Components is a Zener Diode with Zener Voltage 25.1 to 28.9 V, Zener Current 0.5 mA, Voltage Forward 0.9 V, Current 2 mA, Current Reverse Reverse Leakage Current:- 0.1 uA. More details for BZT52C27T can be seen below.