The PTZ20B is a low power SMA Zener diode, manufactured by EIC Semiconductor. It meets the requirements of the Restriction of Hazardous Substances (RoHS) directive, and is designed to provide reliable protection against voltage transients. It offers low capacitance and high clamping voltage, and is a superfet device. It is available in a variety of packaging options, such as surface mount and through hole, and is available in voltage ratings from 4V to 10V. Its low power consumption and low leakage current make it suitable for a variety of applications, including power supplies, interface circuits, and switching circuits.