BUY BZX84C3V9-GS18 https://www.utsource.net/itm/p/11272329.html
BZX84C3V9-GS18 Zener Diodes 3.9V 300mW/0.3W SOT23-3.9V marking Z16 low power
Description: Zener Diode Features: Small SOT23 package Low leakage current Low zener impedance Low reverse current High reliability High temperature stability Applications: Voltage regulation Voltage reference Clamping circuits Reverse voltage protection Surge protection (For reference only)