LM4120IM5-1.8/NOPB

Voltage Reference Overview

The LM4120IM5-1.8/NOPB is a precision micropower low-dropout voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It provides a fixed output voltage of 1.8V with an initial accuracy of ±0.2%. The device operates within an input voltage range of 2V to 12V and draws a supply current of 275µA. It features a maximum output current capability of 5mA and exhibits a temperature coefficient of 50ppm/°C. The component is housed in a compact SOT-23-5 (SC-74A) surface-mount package.

Voltage Reference Feature Summary

• Provides high-precision fixed voltage reference with tight initial tolerance
• Operates as a low-dropout series regulator for stable performance
• Designed for micropower applications with low quiescent current consumption

Voltage Reference Applications

• Precision analog-to-digital converter (ADC) reference sources
• Digital-to-analog converter (DAC) voltage references
• Battery-powered instrumentation requiring stable reference voltages

Voltage Reference Procurement Notes

Verify the manufacturer designation carefully, as the part was originally produced by National Semiconductor before its acquisition by Texas Instruments. Confirm that the suffix /NOPB indicates lead-free and RoHS compliance. Ensure the specific output voltage variant matches the design requirement, as this family includes multiple voltage options.

Voltage Reference Selection Notes

Select this component when a fixed 1.8V reference with ±0.2% accuracy is required in a small SOT-23-5 package. Consider the 275µA supply current and 50ppm/°C temperature coefficient against system power and stability constraints. Verify input voltage compatibility within the 2V to 12V operating range.

Voltage Reference Part Context

This component belongs to the LM4120 series of precision micropower shunt voltage references. The series is characterized by low noise and high stability, making it suitable for sensitive measurement applications. The IM5 suffix denotes the SOT-23-5 package variant, while the -1.8 specifies the fixed 1.8V output option.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4120 variants with different output voltages or packages, such as LM4120AIM5-2.0/NOPB. Cross-family replacements may include LM4128 or REF30 series devices, provided pin compatibility and electrical specifications align with the application requirements.