The ZS4745A is a Zener diode SMA (DO-214AC) RoHS manufactured by Formosa. The Zener diode is designed to regulate the voltage in electronic circuits and protect them from over-voltage or under-voltage. It has a power rating of 4W, a peak reverse voltage of 45V, and a maximum DC voltage of 40V. The Zener diode is manufactured using a high-purity silicon wafer and a special electrode metallization process. It has a maximum reverse current of 2mA, and a typical junction capacitance of 0.2pF. It is RoHS compliant and halide-free, making it safe to use in electronic applications. The Zener diode is designed for low power dissipation and high voltage control. It is suitable for use in industrial, commercial, and consumer applications.