The UTC TL431A is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vref(approximately 2.5V) and 36V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others.
The UTC TL431A linear integrated circuit is a three‑terminal adjustable regulator that can be programmed to provide an output voltage from approximately 2.5 V up to 36 V using two external resistors. It is suitable for shunt, series, switching regulator, voltage reference and other applications.
The datasheet includes absolute maximum ratings, recommended operating conditions, electrical characteristics, typical performance graphs, test circuits and application examples, along with a disclaimer about usage limits and liability.
| Output voltage range | 2.5 V to 36 V |
|---|---|
| Sink current capability | 1 mA to 100 mA |
| Dynamic output impedance | 0.2 Ω |
| Maximum cathode voltage (VKA) | 37 V |
| Cathode current range (continuous) | -100 mA to +150 mA |
| Reference input current range | -0.05 mA to +10 mA |
| Operating junction temperature (Tj) | 150 °C |
| Operating ambient temperature (Topr) | -40 °C to +85 °C |
| Storage temperature range | -65 °C to +150 °C |
The TL431A can be programmed to output any voltage between about 2.5 V and 36 V.
It can sink current from 1 mA up to 100 mA.
The maximum cathode voltage (VKA) is 37 V.
The device operates from –40 °C to +85 °C ambient, with a junction rating of 150 °C.