BUY ZMM55C-18V https://www.utsource.net/itm/p/11272073.html
ZMM55C-18V Zener Diodes 18V 500mW/0.5W SOD80/LL34-18V marking
ZMM55C-18V is a Zener diode manufactured by Solotek. It is a surface-mount device (SMD) with a SOD80/LL34 package. The diode has a maximum power dissipation of 500mW and a breakdown voltage of 18V. It is designed for use in applications such as voltage regulation, overvoltage protection, and reverse polarity protection. (For reference only)