50PCS BZX84C18 BZX84-C18 SOT23 Regulator 18V Y6 Zener Diode Y6 BZX84C 3V0/3V3/3V6/3V9/4V3/5V1/6V2/7V5/8V2/9V1 Z13 Z14 Z15 Z16 Z1