The TL431 is a three-terminal programmable shunt regulator diode. This monolithic IC voltage reference operates as a low-temperature-coefficient zener, programmable from V_ref (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

Resources

• TL431 Datasheet (PDF)