The TL431 is a programmable shunt voltage reference with an adjustable output voltage range of 2.5V to 36V, a sink current capability of 1 to 100mA, and a typical dynamic impedance of 0.22 Ω.
The TL431 is a programmable shunt voltage reference that can be adjusted from 2.5 V to 36 V using two external resistors. It operates over a wide current range (1 mA to 100 mA) and offers a typical output impedance of 0.22 Ω.
The document provides absolute maximum ratings, detailed electrical characteristics, mechanical package dimensions for TO‑92 and SO‑8 variants, and test circuits for performance verification.
| Adjustable output voltage | 2.5 V to 36 V |
|---|---|
| Sink current capability | 1 mA to 100 mA |
| Typical output impedance | 0.22 Ω |
| Cathode‑to‑Anode voltage (max) | 37 V |
| Continuous cathode current range | -100 mA to +150 mA |
The TL431 can be set to any voltage between 2.5 V and 36 V.
It can sink current from 1 mA up to 100 mA.
The maximum cathode‑to‑anode voltage is 37 V.