LM4120IM5X-2.5

Voltage Reference Overview

The LM4120IM5X-2.5 is a micropower shunt voltage reference from the LM4120 series, manufactured by Texas Instruments (originally National Semiconductor). It provides a fixed output of 2.5V with an initial accuracy of ±0.5% and a temperature coefficient of 50ppm/°C. The device operates within an input voltage range of 2V to 12V, drawing a supply current of 275µA. It supports a maximum shunt current of 5mA and functions in temperatures from -40°C to +85°C. Noise performance is specified at 20µVp-p (0.1Hz to 10Hz) and 36µVp-p (10Hz to 10kHz). It is housed in a SOT-23-5 package.

Voltage Reference Feature Summary

• Micropower operation with low supply current consumption suitable for battery-powered applications
• Low dropout design allowing stable regulation with minimal input-to-output voltage difference
• High precision with tight initial accuracy and low temperature drift characteristics
• Compact surface-mount packaging optimized for space-constrained circuit designs

Voltage Reference Applications

• Portable instrumentation requiring precise voltage references
• Battery-operated measurement systems
• Data acquisition systems needing stable analog references
• Medical equipment power management circuits

Voltage Reference Procurement Notes

Verify the manufacturer origin as Texas Instruments acquired National Semiconductor's semiconductor business. Confirm the specific suffix 'X' indicates tape-and-reel packaging if required for automated assembly. Ensure RoHS compliance status matches current regulatory requirements for your region. Check for obsolescence notices or lifecycle status updates on official distributor channels before finalizing procurement plans.

Voltage Reference Selection Notes

Select this component when a fixed 2.5V reference with high precision is needed in a small footprint. Consider the 275µA quiescent current for power-sensitive designs. Verify that the 5mA load capability meets the circuit requirements. Compare noise specifications against other references if ultra-low noise is critical for sensitive analog front ends.

Voltage Reference Part Context

The LM4120 series represents a family of precision micropower shunt voltage references originally developed by National Semiconductor and now produced by Texas Instruments following their merger. These devices are designed to replace older zener diodes and standard reference ICs, offering superior stability and lower power consumption. The IM5X variant specifically denotes the industrial temperature grade in a small outline transistor package with reel packaging.

Voltage Reference Replacement Considerations

LM4120AIM5X-2.5: Offers tighter initial accuracy (±0.2%) compared to the IM5X version (±0.5%). LM4120BIM5X-2.5: Provides even higher precision with ±0.1% initial accuracy. Both alternatives maintain the same pinout and electrical characteristics except for accuracy specifications.