LM4120AIM5-2.0

Voltage Reference Overview

The LM4120AIM5-2.0 is a precision micropower shunt voltage reference manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It provides a fixed output voltage of 2.048V with an initial accuracy of ±0.2%. The device operates within an input voltage range of 2V to 12V and supports a maximum shunt current of 5mA. Key electrical characteristics include a temperature coefficient of 50ppm/°C and low noise performance, specified at 20µVp-p from 0.1Hz to 10Hz and 36µVp-p from 10Hz to 10kHz. It consumes a supply current of 275µA and functions reliably across a temperature range of -40°C to +85°C.

Voltage Reference Feature Summary

• Delivers high-precision fixed voltage output with tight initial tolerance for accurate signal conditioning.
• Features low power consumption suitable for battery-operated and portable applications.
• Provides stable reference performance with low noise characteristics over wide frequency ranges.
• Utilizes compact surface-mount packaging for efficient board space utilization.

Voltage Reference Applications

• Portable instrumentation requiring precise analog-to-digital conversion references
• Battery-powered measurement systems needing low quiescent current sources
• Data acquisition systems utilizing serial analog-to-digital converters
• Medical equipment requiring stable voltage references for sensor interfaces

Voltage Reference Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment upon receipt. Check manufacturing date codes against project requirements. Ensure storage conditions comply with moisture sensitivity level specifications. Validate datasheet revisions to confirm parameter consistency before integration into final designs.

Voltage Reference Selection Notes

Select this component when a fixed 2.048V reference with high accuracy is required. Consider the ±0.2% initial tolerance for precision applications. Evaluate the 275µA supply current for power-sensitive designs. Verify that the 5mA maximum shunt current meets load requirements. Ensure operating temperatures fall within the specified industrial range.

Voltage Reference Part Context

This device belongs to the LM4120 series of micropower voltage references. It is part of Texas Instruments' portfolio following the acquisition of National Semiconductor. The series offers various fixed output voltages in small packages. It serves as a drop-in replacement for older discrete reference solutions. The technology focuses on balancing precision with low power consumption.

Voltage Reference Replacement Considerations

Check for equivalent parts offering similar voltage and accuracy. Verify pin compatibility for direct substitution. Compare temperature coefficients and noise specs. Confirm package dimensions match existing footprints. Review availability status as some variants may be discontinued.