The SPX431BS is a precision adjustable shunt regulator manufactured by Exar Corporation. It functions as a low-voltage adjustable reference and is widely used in electronic circuits for voltage regulation, voltage monitoring, and error amplification. Known for its accuracy and stability, it's well-suited for applications demanding precise voltage control.

Applications

• Switching Power Supplies: Provides a voltage reference in the feedback loop to regulate the output voltage.
• Linear Regulators: Offers a stable reference voltage for linear regulators, ensuring consistent output.
• Voltage Monitors: Used in circuits to monitor voltage levels, triggering alerts or protection when voltage deviates.
• Error Amplifiers: Functions as an error amplifier in control systems to minimize the difference between actual and desired output.
• Instrumentation: Employed in precision measurement instruments for accurate voltage referencing.

Features

• Adjustable Output Voltage: Output voltage adjustable from Vref (2.5V) to 36V using external resistors.
• Low Temperature Coefficient: Ensures stable performance across a range of temperatures.
• High Accuracy: Offers a tight initial tolerance on the reference voltage.
• Low Output Noise: Minimizes noise in the regulated voltage output.
• Low Dynamic Output Impedance: Provides good load regulation.
• Sink Current Capability: Operates with a wide range of cathode current.

Benefits

• Precise Voltage Regulation: Accurate and reliable voltage control in electronic circuits.
• Stable Performance: Consistent performance despite temperature variations and load changes.
• Versatile Application: Suitable for a wide range of voltage regulation and monitoring applications.
• Simplified Circuit Design: Reduces component count and simplifies design.
• Cost-Effective Solution: Offers a high-performance voltage reference at a competitive price.

Additional Details

The SPX431BS is commonly available in a TO-92 package. The reference voltage is internally set to 2.5V. The operating temperature range is typically from -25°C to +85°C. The device requires minimal external components for operation, requiring only two resistors to set the output voltage. It is a three terminal shunt regulator.