LM4120IM5X-3.3

Voltage Reference Overview

The LM4120IM5X-3.3 is a precision micropower low dropout voltage reference manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It provides a fixed output voltage of 3.3 V with an initial accuracy of 0.5% 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 a temperature range from -40°C to +85°C and is housed in a compact SOT-23 surface-mount package.

Voltage Reference Feature Summary

• Delivers stable reference voltage with high precision and low drift characteristics
• Features low power consumption suitable for battery-powered applications
• Provides low dropout operation for efficient voltage regulation
• Designed as a series precision reference with minimal external component requirements

Voltage Reference Applications

• Precision analog-to-digital converter (ADC) references
• Data acquisition systems requiring stable voltage sources
• Portable instrumentation and metering equipment
• Microcontroller supply monitoring circuits

Voltage Reference Procurement Notes

Verify that the specific suffix 'IM5X' corresponds to the intended tape-and-reel packaging configuration rather than cut tape or other variants. Confirm RoHS compliance status as historical data may vary. Ensure the manufacturer designation aligns with current Texas Instruments production standards given the National Semiconductor acquisition. Check for any obsolescence notices or lifecycle changes affecting long-term availability.

Voltage Reference Selection Notes

Select this component when a fixed 3.3 V reference is required with moderate precision needs. Consider the 50 PPM/°C temperature coefficient against application thermal stability requirements. Evaluate the 5 mA maximum shunt current limit to ensure adequate biasing without excessive power dissipation. Compare against higher precision alternatives if tighter initial accuracy or lower noise specifications are necessary for the target design.

Voltage Reference Part Context

The LM4120 belongs to a family of micropower shunt voltage references designed for space-constrained applications. Originally part of the National Semiconductor portfolio, it was integrated into Texas Instruments' product line following corporate acquisition. The IM5X variant specifically denotes the SOT-23 package configuration optimized for automated surface-mount assembly processes in consumer and industrial electronics.

Voltage Reference Replacement Considerations

Public confirmed substitute part numbers include LM4120AIM5X-3.3 for improved accuracy and LM4120BIM5X-3.3 for enhanced performance tiers. Alternative series such as REF30xx or TLV431 may be considered for different package or precision requirements.