LM4120IM5-3.3

Voltage Reference Overview

The LM4120IM5-3.3 is a precision micropower low dropout voltage reference manufactured by Texas Instruments, featuring a fixed nominal output of 3.3 V with an initial accuracy of ±0.5%. It operates within an input voltage range of 2 V to 12 V and supports a maximum shunt current of 5 mA. The device exhibits a temperature coefficient of 50 ppm/°C and functions reliably across a temperature range of -40°C to +85°C. Packaged in a compact SOT-23 (SC-74A) housing with five pins, it draws a supply current of 275 µA.

Voltage Reference Feature Summary

• Provides stable reference voltage with high initial accuracy
• Operates with low quiescent current for power efficiency
• Features low dropout capability for wide input voltage ranges

Voltage Reference Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Microcontroller analog-to-digital converter inputs

Voltage Reference Procurement Notes

Verify the specific suffix 'IM5' confirms the industrial temperature grade and SOT-23 package variant. Confirm RoHS compliance status as some legacy variants may differ. Ensure the ordering part number matches the required 3.3 V output exactly, as other suffixes indicate different voltages or grades. Check for end-of-life notices if sourcing from secondary markets.

Voltage Reference Selection Notes

Select this component when a fixed 3.3 V reference is needed with ±0.5% accuracy. It is suitable for applications where space is limited due to the small SOT-23 footprint. Consider the 50 ppm/°C drift if operating in environments with significant temperature fluctuations. Compare against higher precision options like the AIM5 series if tighter tolerances are required.

Voltage Reference Part Context

The LM4120 belongs to a family of precision micropower voltage references designed for low-cost, high-performance applications. It serves as a stable reference source for ADCs and DACs. The IM5 designation specifically denotes the industrial temperature range and surface-mount packaging, distinguishing it from automotive or military variants within the broader LM4120 product line.

Voltage Reference Replacement Considerations

LM4120AIM5-3.3/NOPB offers improved accuracy at ±0.2% but may have different availability.