LM4431M3X-2.5/NOPB

Voltage Reference Overview

The LM4431M3X-2.5/NOPB is a micropower shunt voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 2.5V with an initial accuracy of 0.5%. The device operates within a supply voltage range of 2.7V to 20V and supports a maximum shunt current of 20mA. It functions reliably across an extended temperature range from -40°C to +85°C. The component is housed in a compact SOT-23 package, suitable for surface-mount applications requiring stable voltage regulation.

Voltage Reference Feature Summary

• Fixed 2.5V output voltage eliminates the need for external resistors
• High precision with 0.5% initial accuracy ensures reliable reference performance
• Micropower design minimizes energy consumption in battery-operated systems

Voltage Reference Applications

• Portable handheld devices requiring low power consumption
• Battery-powered measurement instruments
• Data acquisition systems needing stable voltage references

Voltage Reference Procurement Notes

Verify the specific suffix 'M3X' indicates tape-and-reel packaging when sourcing. Confirm the manufacturer is Texas Instruments or its authorized successor entity following the National Semiconductor acquisition. Ensure the part number matches the exact 2.5V fixed version to avoid confusion with adjustable variants.

Voltage Reference Selection Notes

Select this component when a fixed 2.5V reference is required instead of an adjustable one. Consider the 0.5% accuracy tolerance against application requirements. Evaluate the SOT-23 footprint constraints against available board space. Compare thermal performance needs against the specified operating temperature range.

Voltage Reference Part Context

This part belongs to the LM4431 family of micropower shunt voltage references. It serves as a direct replacement for older National Semiconductor versions. The device integrates a bandgap reference core optimized for low current operation. It is designed for cost-sensitive applications where precision and power efficiency are critical.

Voltage Reference Replacement Considerations

LM4431M3-2.5/NOPB is a confirmed equivalent variant differing primarily in packaging format.