The TL431, A, B Series is a three-terminal programmable shunt regulator diode
The TL431, A, B integrated circuits are three-terminal programmable shunt regulator diodes that operate as low temperature coefficient zener diodes. They are programmable from Vref to 36 V using two external resistors and exhibit a wide operating current range of 1.0 mA to 100 mA. These devices are suitable for applications such as digital voltmeters, power supplies, and opamp circuitry.
| Programmable Output Voltage | Vref to 36 V |
|---|---|
| Voltage Reference Tolerance | ±0.4% Typ @ 25 °C |
| Dynamic Output Impedance | 0.22 Ω Typical |
| Sink Current Capability | 1.0 mA to 100 mA |
| Temperature Coefficient | 50 ppm/ °C Typical |
| Cathode to Anode Voltage (Max) | 37 V |
| Operating Junction Temperature | 150 °C |
| Reference Input Voltage (Typ) | 2.495 V |
The typical dynamic impedance is 0.22 Ω.
The devices exhibit a wide operating current range of 1.0 mA to 100 mA.
Yes, since it operates as a shunt regulator, it can be used as either a positive or negative voltage reference.