LM4121IM5-1.2/NOPB

Voltage Reference Overview

The LM4121IM5-1.2/NOPB is a precision micropower shunt voltage reference manufactured by Texas Instruments, housed in an SOT-23-5 surface-mount package. It provides a fixed output voltage of 1.21 V with an initial accuracy of 0.2% and a temperature coefficient of 50 ppm/°C. The device operates within an input voltage range up to 14 V and supports a maximum shunt current of 5 mA. It functions reliably across an extended temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides high-precision fixed voltage reference with tight initial accuracy tolerance
• Features low temperature coefficient for stable performance across operating ranges
• Designed for micropower applications with minimal current consumption requirements

Voltage Reference Applications

• Portable battery-powered instrumentation systems
• Precision data acquisition circuits requiring stable reference voltages
• Medical equipment requiring accurate signal conditioning references

Voltage Reference Procurement Notes

Verify the specific suffix indicates the fixed 1.2V output variant rather than the adjustable version. Confirm the package type matches the design requirements. Ensure the temperature grade meets the operational environment specifications. Check RoHS compliance status if required by regulatory standards. Validate the manufacturer part number against official Texas Instruments documentation before ordering.

Voltage Reference Selection Notes

Select this component when a fixed, low-drift reference is needed instead of an adjustable one. Compare the 0.2% accuracy against standard 0.5% options for higher precision needs. Consider the 5 mA maximum current limit for load driving capabilities. Evaluate the SOT-23-5 footprint against available board space constraints. Review thermal performance requirements relative to the package's dissipation characteristics.

Voltage Reference Part Context

This device belongs to the LM4121 series of micropower shunt voltage references from Texas Instruments. It serves as a precision alternative to general-purpose zener diodes in low-power analog circuits. The series offers various fixed voltage options alongside adjustable variants to suit different reference needs.

Voltage Reference Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.