LM4121IM5ADJ/NOPB

Voltage Reference Overview

The LM4121IM5ADJ/NOPB is a micropower series voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It operates within an input voltage range of up to 14 V and supports a maximum shunt current of 5 mA. The device provides an adjustable output voltage between 1.21 V and 1.222 V with an initial accuracy of 0.5%. It features a temperature coefficient of 50 ppm/°C and functions reliably across a temperature range from -40°C to +85°C. The component is housed in a SOT-23-5 surface-mount package.

Voltage Reference Feature Summary

• Provides stable micropower series voltage reference functionality
• Supports adjustable output voltage configuration
• Operates with low quiescent current consumption

Voltage Reference Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Handheld meters and test equipment

Voltage Reference Procurement Notes

Verify the manufacturer designation as Texas Instruments for this specific part number, reflecting the corporate acquisition history. Confirm the suffix 'NOPB' indicates lead-free and RoHS compliance status. Ensure the ordering code matches the exact adjustable variant specifications required for your design implementation.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable voltage reference is needed for space-constrained applications. The SOT-23-5 package allows for compact PCB layouts. Consider the 50 ppm/°C temperature coefficient for thermal stability requirements. Verify that the 5 mA maximum shunt current meets the load demands of the target circuit application.

Voltage Reference Part Context

This component belongs to the LM4121 family of micropower voltage references. It serves as a successor or equivalent to earlier National Semiconductor designs following the company's integration into Texas Instruments. The device maintains compatibility with standard series reference topologies while offering improved packaging options for modern surface-mount assembly processes.

Voltage Reference Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.