TL431 Adjustable Precision Shunt Regulator SMD SOT 23 Package

TL431 Adjustable Precision Shunt Regulator SMD SOT 23 Package

The TL431 is a high-precision adjustable shunt voltage regulator that works like a programmable Zener diode. It features a 2.5V precision reference and can be set to regulate voltages up to 36V using an external resistor divider. Because of its excellent accuracy, stability, and fast response, the TL431 is widely used in switch-mode power supplies (SMPS), voltage reference circuits, and feedback control loops.

This SMD version in a compact SOT-23 package is ideal for space-constrained designs while still providing reliable performance. It offers low dynamic output impedance and good temperature stability, making it suitable for both precision analog and digital power control applications.

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Applications

• SMPS feedback and control circuits
• Adjustable voltage reference and regulation
• Overvoltage and undervoltage protection circuits
• Battery chargers and adapters
• Isolated power supply feedback (with optocoupler)
• Voltage monitoring and supervision circuits
• General-purpose shunt regulation

Features

• Type: Adjustable precision shunt regulator
• Reference Voltage: 2.5V (typical)
• Output Voltage Range: Adjustable up to 36V
• Package: SOT-23 (SMD)
• Acts as a programmable Zener diode
• High accuracy and excellent temperature stability
• Low dynamic output impedance
• Fast response time
• Compact size for high-density PCB designs
• High reliability and stable operation