LM4040AIMX-4.1

Overview

The LM4040AIMX-4.1 is a precision shunt voltage reference integrated circuit manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 4.096V with an initial accuracy of ±0.1%. The device operates within a temperature range of -40°C to +85°C and features a low temperature coefficient of 150 ppm/°C. Designed for surface-mount applications, it utilizes an 8-SOIC package. The component supports a maximum shunt current of 15 mA and exhibits low noise characteristics, making it suitable for high-precision analog signal conditioning and data acquisition systems requiring stable reference voltages.

Feature Summary

• Provides a fixed 4.096V output with tight initial tolerance for high-precision applications
• Features low noise performance to ensure signal integrity in sensitive circuits
• Operates reliably across extended industrial temperature ranges

Applications

• Precision data acquisition systems
• Analog-to-digital converter (ADC) reference sources
• Portable instrumentation requiring stable voltage references

Procurement Notes

Verify the manufacturer source carefully, as National Semiconductor assets were acquired by Texas Instruments. Ensure the specific suffix 'MX' corresponds to the 8-SOIC package variant rather than other package options like SOT-23 or SC-70 found in the broader LM4040 family. Confirm RoHS compliance status and check for obsolescence notices from the current manufacturer, as legacy components may have limited availability or require substitution planning.

Selection Notes

Select this component when a fixed 4.096V reference with ±0.1% accuracy is required in an 8-pin surface-mount form factor. Consider the 150 ppm/°C temperature coefficient for thermal stability needs. Compare against lower-cost alternatives if tighter tolerances are not critical. Ensure the application circuit can provide the minimum operating current while staying within the 15 mA maximum shunt current limit to maintain regulation.

Part Context

The LM4040 series represents a family of micropower shunt voltage references designed for precision applications. The LM4040AIMX-4.1 specifically denotes the 4.096V version in the SOIC-8 package. This series is widely used in industrial control, battery-powered devices, and measurement equipment where space efficiency and voltage stability are paramount. The component belongs to the broader PMIC category, serving as a foundational element for accurate voltage scaling and reference generation.

Replacement Considerations

LM4040BIM3-4.1 offers similar electrical specifications but differs in package type (SOT-23-3 vs. SOIC-8). Verify pin compatibility and board space constraints before substituting. Other variants in the LM4040-N series may provide different voltage outputs or accuracies.