The BZX84C18LT1G is an ON Semiconductor Zener diode with an 18V rating at 225mW. It is a general purpose diode and provides an effective method of voltage regulation in power supplies and other electrical circuits. This series diode is designed to protect sensitive semiconductor components from over-voltage conditions. It can be used in a wide range of applications such as in automotive, computing, and industrial applications. The maximum power dissipation of 225mW ensures that the diode can handle higher power. It also has an excellent temperature stability and tight tolerance which makes it highly reliable and suitable for various applications. Additionally, this ON Semiconductor Zener diode offers a wide range of package options such as TO-92, SC-59, and SOT-23-3 among others.