BUY BZX84C15LT1 https://www.utsource.net/itm/p/11272309.html
BZX84C15LT1 Zener Diodes 15V 225mW/0.225W SOT23-15V marking Y4 low power
Description: Zener Diode, 15 V, 500 mW, SOT-23 Features: - Low profile surface mount package - High temperature soldering guaranteed: 260°C/10 seconds at terminals - Low leakage current - High temperature stability - High reliability - Low zener impedance Applications: - Voltage regulation - Voltage reference - Voltage clamping - Surge protection - ESD protection - Switching power supply (For reference only)