LM4140ACMX-2.5

Voltage Reference Overview

The LM4140ACMX-2.5 is a micropower low-dropout series voltage reference manufactured by Texas Instruments, housed in an SOT-23 package. It provides a fixed output voltage of 2.5 V with an initial accuracy of 0.1%. The device features a temperature coefficient of 3 ppm/°C and operates within a junction temperature range of -40°C to +125°C. It draws a typical quiescent current of 180 µA and supports a maximum shunt current of 8 mA. The maximum input voltage is rated at 5.6 V.

Voltage Reference Feature Summary

• Micropower operation with low quiescent current consumption
• Low dropout capability for efficient power management
• High precision with 0.1% initial accuracy and 3 ppm/°C temperature coefficient
• Integrated enable pin for system power control

Voltage Reference Applications

• Portable instrumentation requiring precise voltage references
• Battery-powered measurement systems
• Data acquisition systems
• Medical equipment

Voltage Reference Procurement Notes

Verify the specific suffix 'CMX' indicates the SOT-23 package variant distinct from the SOIC version. Confirm RoHS compliance status as indicated by the NOPB designation if applicable. Ensure the operating temperature range meets the application's thermal requirements. Cross-reference the manufacturer part number with official distributor catalogs to confirm availability and authenticity before procurement.

Voltage Reference Selection Notes

Select this component when a compact SOT-23 footprint is required alongside high precision. Compare against the LM4140BCM variant for lower temperature coefficients if wider operating ranges are needed. Consider the 180 µA quiescent current for battery life calculations. Verify that the 5.6 V maximum input voltage aligns with the system supply rails.

Voltage Reference Part Context

This part belongs to the LM4140 family of micropower low-dropout series voltage references. It shares functional similarities with the LM4140A and LM4140B series but differs in package type and specific performance grades. The LM4140 series is designed to replace older shunt references in space-constrained applications while maintaining high accuracy.

Voltage Reference Replacement Considerations

LM4140ACM-2.5/NOPB (SOIC-8 package)

Voltage Reference FAQ

What is the difference between LM4140ACMX-2.5 and LM4140ACM-2.5?

The primary difference is the package. The LM4140ACMX-2.5 uses an SOT-23 package, while the LM4140ACM-2.5 typically refers to the SOIC-8 package variant.

Does the LM4140ACMX-2.5 have an enable pin?

Yes, the LM4140 series includes an enable pin to control power consumption in portable applications.