TL431A Integrated Circuit: Pinout, Equivalent and Datasheet

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The TL431A integrated circuit is three−terminal programmable shunt regulator diode. The monolithic IC voltage reference operates as a low temperature coefficient zener which is programmable from Vref to 36 V with two external resistors. The device exhibits a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω.

This article provides you with a basic overview of the TL431A, including its pin descriptions, features and specifications, etc., to help you quickly understand what TL431A is.

● Programmable Output Voltage to 36 V

● Voltage Reference Tolerance: ±0.4%, Typ @ 25°C (TL431B)

● Low Dynamic Output Impedance, 0.22 Ω Typical

● Sink Current Capability of 1.0 mA to 100 mA

● Equivalent Full−Range Temperature Coefficient of 50 ppm/°C Typical

● Temperature Compensated for Operation over Full Rated Operating Temperature Range

● Low Output Noise Voltage

● NCV/SCV Prefixes for Automotive and Other Applications Requiring Unique Site and Control Change                                     Requirements; AEC−Q100 Qualified and PPAP Capable

● The Device is Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

The characteristics of the reference makes them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431A operates as a shunt regulator, it can be used as either a positive or negative voltage reference. 

The TL431 is a programmable precision reference which is used in a variety of ways. It serves as a reference voltage in circuits where a non−standard reference voltage is needed. In each of these applications, it is critical to maintain stability of the device at various operating currents and load capacitances.

Representative Block Diagram

Representative Schematic Diagram

Simplified TL431 Device Model

● Shunt Regulator

● High Current Shunt Regulator

● Series Pass Regulator

● TRIAC Crowbar

● SRC Crowbar

● Voltage Monitor

● Linear Ohmmeter

● Simple 400 mW Phono Amplifier

● High Efficiency Step−Down Switching Converter

SOIC−8 Package

Soldering Footprint

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