The TL431A, B integrated circuits are three-terminal programmable shunt regulator diodes.

These monolithic IC voltage references operate as a low-temperature-coefficient zener diode, which is programmable from Vref to 36 V with two external resistors. These devices exhibit a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. 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 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431A, B operates as a shunt regulator, it can be used as either a positive or negative voltage reference.

Features

• 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

• These Devices are Pb-Free, Halogen-Free/BFR-Free and are RoHS Compliant