Taiwan semiconductor bzv55c series smd zener diodes 500mw mini melf taiwan semiconductor bzv55c18 l1 a 500mw 18v zener diode designed for use as a voltage regulator the zener diode is supplied in a surface mounting ll 34 mini melf package that is suitable for automatic pick and place manufacturing taiwan semiconductor bzv55c18 zener diode 18v 500mw mini melf