The TL431AILPR is a Programmable Precision Reference manufactured by Texas Instruments. It is a three-terminal adjustable shunt regulator designed to operate as an adjustable precision voltage reference in adjustable or set point power supplies, battery chargers, automatic test equipment, and other applications. The TL431AILPR has a wide operating range of 8.5V to 36V, a wide output range of 1.242V to 32V, and offers a highly accurate 2.495V reference. This device also provides a wide temperature range of -40°C to 125°C and has an output current rating of 20mA max. The TL431AILPR can be programmed using an external voltage divider or an external potentiometer to set the output voltage up to an accuracy of ±1%.