The onsemi TL431ACD is a versatile, adjustable precision shunt voltage reference that is widely used in various electronic applications. It is designed to provide a stable reference voltage with high accuracy and low temperature drift, making it suitable for use in power supplies, voltage regulation, and signal conditioning circuits. The TL431ACD is particularly valued for its flexibility, allowing it to be configured for a wide range of output voltages.

## Overview

The TL431ACD operates as a three-terminal adjustable shunt regulator, which can be used to regulate voltage in a variety of applications. It features a reference voltage of 1.25V, which can be adjusted using external resistors to achieve the desired output voltage. The device is designed to operate over a wide input voltage range and can handle load currents up to 100 mA, making it suitable for both low-power and high-power applications.

## Key Features

1. Adjustable Output Voltage: The TL431ACD allows for an adjustable output voltage from 1.25V to 36V, providing flexibility for various applications.
2. High Accuracy: The device offers a typical reference voltage accuracy of ±1%, ensuring reliable performance in precision applications.
3. Low Temperature Coefficient: With a temperature coefficient of 50 ppm/°C (typical), the TL431ACD maintains stable performance across a wide temperature range.
4. Wide Input Voltage Range: The device can operate with input voltages ranging from 2.5V to 36V, making it versatile for different power supply designs.
5. High Output Current: The TL431ACD can source or sink up to 100 mA of output current, allowing it to drive various loads effectively.
6. Low Noise: The device features low output noise, which is essential for applications requiring high precision and stability.
7. Compact Package: The TL431ACD is available in a compact TO-92 package, making it suitable for space-constrained applications.

## Specifications

- Reference Voltage (VREF): 1.25V (typical)
- Adjustable Output Voltage Range: 1.25V to 36V
- Input Voltage Range: 2.5V to 36V
- Output Current: 0 mA to 100 mA
- Reference Voltage Accuracy: ±1% (at 25°C)
- Temperature Coefficient: 50 ppm/°C (typical)
- Dynamic Output Impedance: 0.2 Ω (typical)
- Operating Temperature Range: -40°C to +125°C
- Package Type: TO-92, SOT-23, and others

## Applications

The TL431ACD is suitable for a wide range of applications, including:

- Power Supply Regulation: Used in switching power supplies and linear regulators to provide stable output voltages.
- Voltage Reference: Acts as a precision voltage reference in various measurement and control systems.
- Signal Conditioning: Employed in circuits that require stable reference voltages for signal processing.
- Battery Management Systems: Utilized in battery chargers and management systems to monitor and regulate voltage levels.

## Conclusion

The onsemi TL431ACD is a highly versatile and reliable adjustable shunt voltage reference that meets the demands of modern electronic applications. With its wide input voltage range, high accuracy, and low temperature drift, it is an excellent choice for engineers looking to implement precise voltage regulation in their designs. Its compact size and ease of integration make it a popular choice across various industries, ensuring dependable performance in critical applications.