The TL431CL3T is a three terminal programmable precision reference from STMicroelectronics. This device combines a two terminal band gap voltage reference and a three terminal adjustable shunt regulator. It operates over an input voltage range of 2.5V to 34V, making it suitable for a wide range of applications including power supplies, switch mode supplies and other industrial control systems. Its features include over voltage protection and under voltage lockout to provide enhanced protection of system components. It also offers an accurate reference voltage of 2.5V and its output can be adjusted to between 1.24V and 36V. The TL431CL3T from STMicroelectronics is a cost-effective and reliable solution for voltage regulation in many applications.