LM4120IM5-4.1

Voltage Reference Overview

The LM4120IM5-4.1 is a micropower shunt voltage reference manufactured by Texas Instruments, which acquired National Semiconductor. It provides a fixed output of 4.096 V with an initial accuracy of 0.5% and a temperature coefficient of 50 ppm/°C. The device operates within an input voltage range of 2 V to 12 V and draws a typical supply current of 275 µA. It supports a maximum shunt current of 5 mA and functions reliably across a temperature range of -40°C to +85°C. Packaged in a compact SOT-23-5 surface-mount case, it offers low noise performance suitable for precision applications.

Voltage Reference Feature Summary

• Micropower operation with low quiescent current consumption
• Low dropout design allowing wide input voltage flexibility
• High precision with tight initial accuracy tolerance
• Compact surface-mount packaging for space-constrained designs

Voltage Reference Applications

• Portable instrumentation requiring stable reference voltages
• Battery-powered measurement systems
• Data acquisition systems needing precise analog references
• Medical equipment requiring reliable signal conditioning

Voltage Reference Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as legacy variants may differ. Check for obsolescence notices since National Semiconductor assets are managed by Texas Instruments. Ensure the specific suffix matches required accuracy grades. Validate package markings against official datasheet specifications to prevent counterfeit infiltration.

Voltage Reference Selection Notes

Select this part when a fixed 4.096 V reference is required with moderate precision. Consider the 0.5% accuracy grade for cost-sensitive applications. Evaluate thermal management needs given the small SOT-23-5 footprint. Compare power consumption requirements against other series options if lower current draw is critical. Verify input voltage constraints align with system supply rails.

Voltage Reference Part Context

This component belongs to the LM4120 family of precision micropower shunt voltage references. The family includes various fixed output voltages and accuracy grades. Texas Instruments continues support for these legacy National Semiconductor parts. The SOT-23-5 package remains standard for this series. Designers often use this family for general-purpose reference needs in mixed-signal circuits.

Voltage Reference Replacement Considerations

LM4120AIM5-4.1/NOPB: Higher accuracy variant (0.2%) from Texas Instruments. LM4120BIM5-4.1/NOPB: Even tighter tolerance option. LM4040 series: Alternative shunt reference with different form factors. Verify pinout compatibility before substitution.