About LM431

The LM431 is a highly versatile and reliable voltage reference integrated circuit (IC). It serves as an adjustable precision Zener shunt regulator, providing a stable and accurate reference voltage for a wide range of applications. With its 3-terminal design, the LM431 offers flexibility in adjusting the shunt regulation. The device ensures temperature stability across the entire temperature range of operation, making it suitable for demanding environments.

One of the key features of the LM431 is its adjustable output voltage. By selecting two external resistors, users can set the output voltage at any level greater than 2.5 V (VREF) up to 36 V. This flexibility allows for precise and customized voltage regulation according to specific application requirements. Moreover, the LM431 exhibits sharp turn-on characteristics, making it an excellent substitute for traditional Zener diodes in various applications.

With its compact SOT23 package, the LM431 offers space-saving advantages and ease of integration into electronic circuits. It can handle a maximum current of 100 mA, ensuring compatibility with a wide range of devices and systems. Whether it’s used in power supplies, voltage regulators, or other electronic circuits, the LM431 provides reliable and accurate voltage references, contributing to the overall performance and stability of the system.

Features

• Adjustable Output Voltage: The LM431 allows users to adjust the output voltage by selecting two external resistors, providing flexibility and customization in voltage regulation. The output voltage can be set anywhere between 2.5 V (VREF) and 36 V, catering to specific application requirements.
• Temperature Stability: With ensured temperature stability over the entire temperature range of operation, the LM431 performs reliably in demanding environments. It maintains a stable reference voltage despite temperature variations, ensuring consistent and accurate voltage regulation.
• Sharp Turn-On Characteristics: The LM431 exhibits sharp turn-on characteristics, making it an excellent alternative to traditional Zener diodes. This feature enables fast and precise response in voltage regulation applications.

Specifications

Applications

1. Power Supplies: The LM431 is commonly used in power supply circuits to provide accurate and stable voltage references. It ensures consistent output voltage levels, contributing to the overall performance and reliability of the power supply system.
2. Voltage Regulators: As an adjustable precision shunt regulator, the LM431 is suitable for voltage regulation applications. It can be used as a voltage reference in various voltage regulator circuits, maintaining a stable output voltage despite fluctuations in input voltage or load conditions.
   
3. Electronic Circuits: The compact size and compatibility of the LM431 make it suitable for integration into various electronic circuits. It can be utilized in systems that require precise voltage references, such as amplifiers, analog-to-digital converters, and sensor interfaces, ensuring accurate and reliable signal processing.

Datasheet Download: LM431 Datasheet

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