LM4120AIM5-3.3

Voltage Reference Overview

The LM4120AIM5-3.3 is a precision micropower low dropout voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 3.3 V with an initial accuracy of ±0.2%. The device operates within an input voltage range of 2 V to 12 V and draws a supply current of 275 µA. It features a temperature coefficient of 50 ppm/°C and supports a maximum shunt current of 5 mA. The component is housed in a SOT-23-5 package, suitable for surface mount installation, and functions reliably across a temperature range of -40°C to +85°C.

Voltage Reference Feature Summary

• Delivers high-precision fixed voltage output with tight initial accuracy tolerance
• Operates as a micropower device with low quiescent current consumption
• Features low dropout characteristics allowing operation from minimal input voltage headroom
• Provides stable reference performance over extended industrial temperature ranges

Voltage Reference Applications

• Portable battery-powered instrumentation requiring precise voltage references
• Data acquisition systems needing stable analog-to-digital converter references
• Medical equipment utilizing low-power precision signal conditioning circuits
• Industrial process control loops requiring accurate sensor excitation voltages

Voltage Reference Procurement Notes

Verify the specific suffix codes against the manufacturer datasheet to confirm pinout compatibility and electrical specifications. Ensure the ordering part number matches the required output voltage and accuracy grade. Check for RoHS compliance status if environmental regulations apply to your manufacturing process. Confirm package type availability aligns with your PCB footprint requirements before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a fixed 3.3 V reference with ±0.2% accuracy is required in a compact SOT-23-5 package. Consider the 275 µA supply current for battery life calculations in portable designs. Evaluate the 50 ppm/°C temperature coefficient against your system's thermal stability needs. Ensure the input voltage remains within the specified 2 V to 12 V range for proper regulation.

Voltage Reference Part Context

This device belongs to the LM4120 family of precision micropower voltage references from Texas Instruments. The series offers various fixed output voltages and accuracy grades in small surface-mount packages. It serves as a drop-in replacement for older National Semiconductor versions, maintaining functional compatibility while adhering to modern manufacturing standards and packaging technologies.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4120 variants with different output voltages or accuracy grades from the same family. Verify pinout compatibility when considering cross-manufacturer alternatives. Ensure equivalent temperature coefficients and noise specifications match the original design requirements for seamless integration.