The TL431 integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two external resistors. These devices exhibit a wide operating current range to 100mA with a typical dynamic impedance 0.22 . The characteristics of these references make them

excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 volt reference makes it convenient to obtain a stable reference from 5.0 volt logic supplies, and since the TL431 operates as a shunt regulator, it can be used as either a positive or negative voltage reference.

l Programmable Output Voltage to 36 Volts l Low Dynamic Output Impedance, 0.22 Typical l Sink Current Capability mA l Equivalent Full-Range Temperature Coefficient of 50 ppm/ oC Typical l Temperature Compensated for operation over Full Rated Operating Temperature Range l Low Output Noise Voltage

This is an internally modified SOP-8 Package. Pins 3, 6 and 7 are electrically common to the die attach flag. This internal lead frame modification decreases package thermal resistance and increases power dissipation capability when appropriately mounted on a printed circuit board. This SOP-8 conforms to all external dimensions of the standard SOP-8 package.

Rating Cathode to Anode Voltage Cathode Current Range, Continuous Reference Input Current Range, Continuous Operating Junction Temperature Operating Ambient Temperature Range TL431AC, TL431BC Storage Temperature Range Total Power Dissipation 25 C Derate above = 25oC Ambient Temperature T, S Suffix Packages D Suffix Package Total Power Dissipation = 25oC Derate above = 25oC Case Temperature T, S Suffix Packages D Suffix Package

Characteristic Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol T, S Suffix 83 D Suffix 114 41 Unit

Condition / Value Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol VA IK Min Vref 1.0 Max 36 100 Unit V mA

Reference Input Voltage (Fig. 1) VKA = Vref, TA = Tlow to Thigh (Note 1) Reference Input Voltage Deviation Over Temperature Range (Fig. 1, Note 2, 4) VKA = Vref, = 10mA Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage = 10mA (Fig. 2), VKA 10V to Vref VKA to 10V Reference Input Current (Fig. TA = Tlow to Thigh (Note 1) 8 Reference Input Current Deviation Over Temperature Range (Fig. 2, Note = 8 Minimum Cathode Current for Regulation VKA = Vref (Fig. 1) Off - State Cathode Current (Fig. 3) VKA = 36V, Vref = 0V Dynamic Impedance (Fig. 1, Note 3) VKA = Vref, < 1.0 kHz

Reference Input Voltage (Fig. 1) VKA = Vref, TA = Tlow to Thigh (Note 1) Reference Input Voltage Deviation Over Temperature Range (Fig. 1, Note 2, 4) VKA = Vref, = 10mA Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage = 10mA (Fig. 2), VKA 10V to Vref VKA to 10V Reference Input Current (Fig. TA = Tlow to Thigh (Note 1) 8 Reference Input Current Deviation Over Temperature Range (Fig. 2, Note R2 = Minimum Cathode Current for Regulation VKA = Vref (Fig. 1) Off - State Cathode Current (Fig. 3) VKA = 36V, Vref = 0V Dynamic Impedance (Fig. 1, Note 3) VKA = Vref, < 1.0 kHz 8