IC TL431A
New Voltage regulatorsAn adjustable voltage shunt regulator with precisely defined thermal stability. The output voltage can be adjusted over a wide range, from the reference voltage of 2.5V up to 36V, using just two external resistors. An excellent replacement for Zener diodes. Vout = 2.5V to 36V. Current - 100mA at Vout 36V. Package - TO-92
