BUY BZT52C4V3S W6 https://www.utsource.net/itm/p/9275342.html

W6 Package: SOD-323 Description: BZT52C4V3S W6 is a 4.3V Zener diode with a maximum power dissipation of 500mW in a SOD-323 package. Features: Low leakage current Low noise High stability High reliability High temperature operation Applications: Voltage regulation Voltage stabilization Overvoltage protection Reverse bias protection (For reference only)