LM4140BCMX-1.2/NOPB

Voltage Reference Overview

The LM4140BCMX-1.2/NOPB is a micropower low-dropout series voltage reference manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. It provides a fixed output voltage of 1.25 V with an initial accuracy of 0.1%. The device features a temperature coefficient of 6 ppm/°C and operates within a junction temperature range of 0°C to +70°C. Maximum shunt current is rated at 8 mA, with a maximum input voltage of 5.6 V. Quiescent current ranges from 230 µA to 265 µA.

Voltage Reference Feature Summary

• Provides precision micropower series voltage regulation with low dropout capability
• Features high stability with a low temperature coefficient for consistent performance across thermal variations
• Includes an enable pin for power management control

Voltage Reference Applications

• Precision analog-to-digital converter (ADC) references
• Digital-to-analog converter (DAC) voltage sources
• Battery-powered instrumentation systems
• Portable measurement equipment requiring stable bias voltages

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free composition and RoHS compliance as per manufacturer specifications. Confirm the 'CMX' designation corresponds to the tape-and-reel packaging format rather than tube packaging. Ensure the operating temperature grade matches the application requirements, as this variant is specified for commercial temperatures. Cross-reference the datasheet revision to confirm electrical characteristics remain unchanged.

Voltage Reference Selection Notes

Select this component when a fixed 1.25 V reference is required with tight initial accuracy and low drift. The micropower consumption makes it suitable for battery-operated designs where efficiency is critical. The SOIC-8 package offers a balance between thermal performance and board space constraints compared to smaller packages. Consider the maximum shunt current limit when designing the load circuitry to ensure operation within safe boundaries.

Voltage Reference Part Context

This part belongs to the LM4140 family of precision micropower shunt voltage references. It shares architectural similarities with other variants in the series, differing primarily in output voltage, accuracy grades, and packaging options. The LM4140 series is designed to replace older bandgap references while offering improved noise performance and lower quiescent current. It serves as a fundamental building block for high-precision data acquisition systems.

Voltage Reference Replacement Considerations

• LM4140AIM3-1.2/NOPB
• LM4140CIM3-1.2/NOPB

Voltage Reference FAQ

What is the function of the Enable pin on the LM4140BCMX-1.2/NOPB?

The Enable pin allows the user to disable the reference output, reducing quiescent current to near zero for power-saving applications.

Does the LM4140BCMX-1.2/NOPB require external components for basic operation?

No external components are required for basic voltage reference functionality; however, a bypass capacitor may be recommended for optimal noise performance depending on the application.