LM4140ACMX-1.2/NOPB

Voltage Reference Overview

The LM4140ACMX-1.2/NOPB is a micropower low-dropout series voltage reference manufactured by Texas Instruments, housed in an 8-pin VSSOP package. It provides a fixed output voltage of 1.25V with an initial accuracy of 0.1% and a temperature coefficient of 3 ppm/°C. The device operates within a supply voltage range of 1.8V to 5.6V, drawing a typical quiescent current of 230 µA. It supports a maximum shunt current of 8 mA and functions reliably across an operating temperature range of -40°C to +85°C.

Voltage Reference Feature Summary

• Features a low dropout characteristic allowing operation with minimal input-to-output voltage difference.
• Provides high precision stability through tight initial accuracy and low temperature drift specifications.
• Incorporates an enable pin for power management control to reduce consumption during inactive periods.

Voltage Reference Applications

• Precision data acquisition systems requiring stable reference voltages
• Battery-powered portable instrumentation due to low power consumption
• High-resolution analog-to-digital converter (ADC) references

Voltage Reference Procurement Notes

Verify the specific suffix 'CMX' confirms the VSSOP-8 tape-and-reel packaging variant distinct from tube-packaged SOIC versions. Confirm the '-NOPB' designation indicates lead-free and RoHS compliance status as per manufacturer standards. Ensure the 'A' grade selection matches the required 3 ppm/°C temperature coefficient specification for your thermal environment.

Voltage Reference Selection Notes

Select this component when a fixed 1.25V reference is required in space-constrained designs utilizing VSSOP packages. It is suitable for applications demanding lower noise and higher precision than standard shunt references, while offering better efficiency than adjustable regulator-based solutions. Consider the 230 µA quiescent current against battery life requirements.

Voltage Reference Part Context

This part belongs to the LM4140 family of micropower low-dropout series voltage references from Texas Instruments. Unlike shunt references such as the LM4040, it regulates voltage in series with the load, offering superior line regulation and lower minimum operating currents. The family includes various output voltages and package options to support diverse industrial and consumer electronics needs.

Voltage Reference Replacement Considerations

LM4140ACM-1.2/NOPB offers identical electrical specifications but utilizes an SOIC-8 tube package instead of VSSOP. LM4140BCMX-1.2/NOPB provides similar performance with a slightly higher temperature coefficient of 6 ppm/°C. Verify pin compatibility and thermal dissipation requirements when substituting between package types.

Voltage Reference FAQ

What is the minimum operating voltage for the LM4140ACMX-1.2/NOPB?

The device requires a minimum supply voltage of 1.8V to operate correctly.

Does this component include an enable feature?

Yes, the LM4140 series includes an enable pin that allows the user to disable the reference, reducing current consumption to less than 1 µA.