The UDZSNPTE-1718B is a surface mount Zener diode in a SOD-323 package made by ROHM. It is a RoHS compliant part that provides reliable voltage regulation for power supplies and other electronic circuits. The device is composed of two Zener diodes in series with a series termination resistor for ESD protection. The Zener diodes provide voltage regulation from 18V to 24V with a low dynamic impedance at a typical reverse leakage current of 1mA. This makes it suitable for a variety of applications such as portable devices, automotive electronics, and consumer electronics, including cars, laptops, digital cameras, and PDAs.