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TL431 - Voltage Reference
Discontinued
The TL431 is a three-terminal programmable shunt regulator diode. This monolithic IC voltage reference operates as a low-temperature-coefficient zener, programmable from Vref (2.5 V) to 36 V with two external resistors. With a wide operating current range and low dynamic impedance, it serves as an excellent replacement for zener diodes in power supplies, voltage references, and op-amp circuits.
Key Features
- Programmable Output – Adjustable from 2.5 V to 36 V with two external resistors
- Low Dynamic Impedance – 0.22 Ω typical for stable regulation
- Wide Current Range – 1.0 mA to 100 mA sink capability
- Low Temperature Coefficient – 50 ppm/°C typical across full operating range
- Versatile – Usable as positive or negative voltage reference (shunt regulator)
- Low Output Noise – Clean reference voltage for precision circuits
Specifications
- Part Number – TL431
- Reference Voltage – 2.5 V (programmable up to 36 V)
- Tolerance – ±0.4% typical at 25 °C (TL431B)
- Dynamic Impedance – 0.22 Ω typical
- Sink Current – 1.0 mA to 100 mA
- Temperature Coefficient – 50 ppm/°C typical
- Package – TO-92
- RoHS – Pb and halide-free
Ideal For
- Precision voltage references from 5 V logic supplies
- Power supply regulation and feedback circuits
- Zener diode replacement in analogue circuits
- Digital voltmeter reference circuits
Package Contents
- 1× TL431 Programmable Shunt Regulator
