LM431AIM3X

Voltage Reference Overview

The LM431AIM3X is a three-terminal adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an input voltage range of 2.5 V to 37 V and provides an initial accuracy of 0.5%. The device supports a maximum cathode current of 100 mA and features a temperature coefficient of 50 ppm/°C. It is housed in a surface-mount SOT-23-3 package and functions reliably across an industrial temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides precise voltage regulation with 0.5% initial accuracy for high-performance reference applications
• Features low temperature coefficient of 50 ppm/°C ensuring thermal stability over the operating range
• Supports high cathode current capability up to 100 mA for robust load driving

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable output regulators
• Battery charging control systems

Voltage Reference Procurement Notes

Verify the specific suffix configuration against the manufacturer's official documentation to confirm pinout compatibility and electrical tolerances. Ensure the component matches the required accuracy grade and package type for your design. Cross-reference the ordering part number with the latest datasheet revision to avoid discrepancies in specifications or lead times.

Voltage Reference Selection Notes

Select this component when a compact surface-mount solution requires high accuracy and low temperature drift. The SOT-23-3 package offers space efficiency compared to through-hole alternatives. Consider the 100 mA current limit and 37 V maximum input voltage when designing the circuit topology to ensure operation within safe limits.

Voltage Reference Part Context

This device belongs to the LM431 family of adjustable shunt regulators, which are widely used as programmable Zener diodes. The LM431 series serves as a standard reference for voltage regulation in various analog and mixed-signal applications. The AIM3X designation indicates a specific accuracy grade and surface-mount packaging variant within the broader product line.

Voltage Reference Replacement Considerations

Direct replacements include LM431AIM3X/NOPB and LM431CIM3X/NOPB. Verify that substitute parts maintain the same 0.5% accuracy and SOT-23-3 package dimensions. Check for any changes in temperature coefficient or current handling capabilities before finalizing the substitution.