LM4120IM5-1.8

Voltage Reference Overview

The LM4120IM5-1.8 is a precision micropower low-dropout voltage reference manufactured by National Semiconductor, now part of Texas Instruments. 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 supports a maximum shunt current of 5mA. It features a temperature coefficient of 50ppm/°C and consumes a supply current of 275µA. The component is housed in a SOT-23-5 package and functions 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 circuit referencing.
• Operates as a micropower device with low quiescent current consumption suitable for battery-powered applications.
• Utilizes a low-dropout architecture allowing stable regulation over a wide input voltage range.
• Provides stable performance across industrial temperature ranges with low temperature drift.

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required accuracy grade and packaging variant. Confirm RoHS compliance status if environmental regulations apply to your deployment. Cross-reference the datasheet revision to ensure parameter consistency with your design requirements.

Voltage Reference Selection Notes

Select this component when a fixed 1.8V reference with ±0.2% accuracy is required in a compact surface-mount package. Consider the 275µA supply current for power budget constraints. Evaluate the 50ppm/°C temperature coefficient against your system's thermal stability needs. Ensure the input voltage remains within the specified 2V to 12V operational window for proper regulation.

Voltage Reference Part Context

The LM4120 series represents a family of precision micropower voltage references originally developed by National Semiconductor. These devices are designed to replace zener diodes in applications requiring higher accuracy and lower noise. The IM5 variant specifically denotes the SOT-23-5 surface-mount package configuration, facilitating automated assembly and space-constrained PCB designs.

Voltage Reference Replacement Considerations

Check for LP4120 variants or other Texas Instruments equivalents in the same precision reference family. Verify pin compatibility and electrical parameters before substituting with generic LDO regulators, as voltage references have distinct stability requirements.