LM4140CCMX-2.5

Voltage Reference Overview

The LM4140CCMX-2.5 is a micropower low-dropout series voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 2.5V with an initial accuracy of 0.1% and a temperature coefficient of 3 ppm/°C. The device operates within a supply voltage range up to 5.6V and draws a typical quiescent current of 175 µA. It is housed in an 8-pin SOIC package and functions as a three-terminal precision reference suitable for applications requiring stable voltage sources.

Voltage Reference Feature Summary

• Micropower operation with low quiescent current consumption
• High precision with 0.1% initial accuracy and low temperature drift
• Low-dropout regulator architecture for efficient voltage regulation
• Integrated enable pin for power management control

Voltage Reference Applications

• Portable instrumentation requiring precise voltage references
• Battery-powered measurement systems
• Data acquisition systems needing stable analog references
• Medical equipment requiring high accuracy voltage sources

Voltage Reference Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the ordering suffix matches the required package type and temperature range. Confirm RoHS compliance status through official documentation, as legacy parts may have different environmental certifications than current production runs.

Voltage Reference Selection Notes

Select this component when a fixed 2.5V reference with high precision is required in a surface-mount package. Compare the 3 ppm/°C temperature coefficient against application thermal stability needs. Consider the 175 µA quiescent current for battery life calculations. Verify that the 5.6V maximum input voltage aligns with the system supply rails.

Voltage Reference Part Context

This part belongs to the LM4140 family of micropower shunt voltage references. The 'CC' suffix typically denotes commercial temperature range and specific accuracy grades. The 'CMX' indicates the SOIC-8 surface-mount package variant. This family is designed for applications where space and power consumption are critical constraints.

Voltage Reference Replacement Considerations

LM4140ACMX-2.5/NOPB offers similar specifications with potential minor variations in initial accuracy or temperature coefficient depending on the specific grade. LM4140DIMX-2.5 provides the same functionality in a smaller SOT-23 package. Verify pin compatibility and thermal performance before substitution.