TL431A Programmable Precision Shunt Regulator (2.5V, SOT-23)

The TL431A (including TL431AIDBZR and TL431AQDBZR) is an industry-standard, three-terminal adjustable shunt regulator offering excellent temperature stability and high reliability. Functioning essentially as a programmable Zener diode, this IC allows you to set the output voltage to any value between its internal 2.5V reference and 36V using two external resistors.

With a precision tolerance of just 1% (denoted by the 'A' suffix), it is an essential component for designing high-quality power supplies, voltage monitors, and current sources. The compact SOT-23 surface-mount package saves valuable PCB space, making it perfect for modern, densely packed electronic designs. Whether you are building an isolated switch-mode power supply (SMPS) or a precise battery charger, the TL431A delivers sharp turn-on characteristics and low output noise.

Key Features:

• High Precision: Features a tight 1% voltage reference tolerance for highly accurate voltage regulation.

• Programmable Output: Easily adjustable output voltage from 2.5V up to 36V using a simple resistor divider.

• Wide Current Range: Capable of sinking current from 1 mA to 100 mA with a low dynamic output impedance.

• Industrial/Automotive Grade: 'I' and 'Q' variants ensure robust operation across wide temperature ranges, suitable for demanding environments.

Specifications:

• Component Type: Adjustable Shunt Regulator / Voltage Reference

• Reference Voltage: 2.5V

• Voltage Tolerance: ±1%

• Max Output Voltage: 36V

• Sink Current Capability: 1 mA to 100 mA

• Package Type: SOT-23-3 (SMD/SMT)