TL431CLP Precision Programmable Voltage Reference (D1017). TO-92 Package. TL431 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. TL431CL.