The TL431CZ-AP is a shunt voltage reference integrated circuit (IC) manufactured by STMicroelectronics. It is an adjustable 2.495V 36 VV ±2.21% part, with a package type of TO-92-3, and a current rating of 100mA. It is a commonly used device for voltage regulation, precision current-limiting, and programming of voltage-set pins in switch-mode power supplies, linear regulators, battery chargers, and DC-DC converters. The part is adjustable via an external voltage divider network and has an operating temperature range of -40°C to +125°C. Its features include low soft-start time, low power dissipation, and low output noise for quieter operation.