LM4140ACM-1.2

Voltage Reference Overview

The LM4140ACM-1.2/NOPB is a micropower low-dropout series voltage reference manufactured by Texas Instruments, housed in an SOIC-8 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 3 ppm/°C and operates within a supply voltage range up to 5.6 V. Typical operating current is 230 µA, reducing to ≤1 µA in disable mode. It supports a maximum shunt current of 8 mA and functions between 0°C and +70°C.

Voltage Reference Feature Summary

• Provides high-precision voltage referencing with 0.1% initial accuracy for critical measurement applications.
• Features ultra-low noise characteristics to minimize signal interference in sensitive circuits.
• Ensures stable performance across temperature variations with a 3 ppm/°C temperature coefficient.
• Includes an enable pin for power management, achieving microampere-level current consumption in disabled mode.

Voltage Reference Applications

• High-precision instrumentation and test equipment requiring stable voltage references.
• Portable battery-powered devices utilizing the low quiescent current and enable functionality.
• Data acquisition systems demanding low noise and high accuracy analog-to-digital converter references.
• Medical equipment requiring reliable precision voltage sources for sensor interfaces.

Voltage Reference Procurement Notes

Verify the complete ordering part number includes the NOPB suffix to ensure lead-free compliance and specific package configuration. Confirm the required temperature grade matches the commercial range specifications. Check datasheet details for correct pinout alignment during PCB layout verification. Ensure input voltage constraints are respected to maintain regulation integrity.

Voltage Reference Selection Notes

Select this component when circuit design requires a fixed 1.25 V reference with stringent accuracy and noise requirements. Consider the SOIC-8 package for surface-mount assembly compatibility. Evaluate the 3 ppm/°C drift against environmental thermal conditions. Compare the 230 µA typical current draw against system power budget constraints.

Voltage Reference Part Context

This device belongs to the LM4140 family of precision micropower voltage references from Texas Instruments. It shares architectural similarities with other members like the LM4140BCM variants but differs in specific accuracy grades and package options. The series is designed for applications needing stable, low-noise references without the complexity of adjustable regulators.

Voltage Reference Replacement Considerations

LM4140ACM-2.0/NOPB

Voltage Reference FAQ

What is the typical quiescent current consumption?

The typical operating current is 230 µA, which reduces to less than 1 µA when the device is in disable mode.

Does the device include an enable feature?

Yes, the LM4140ACM-1.2 includes an enable pin that allows the user to control power consumption by disabling the reference.