LM4120IM5-5.0

Voltage Reference Overview

The LM4120IM5-5.0 is a precision micropower low dropout voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 5.0 V with an initial accuracy of ±0.5%. The device operates within an input voltage range of 2.7 V to 12 V and draws a typical quiescent current of 130 µA. It features a temperature coefficient of 50 ppm/°C over the industrial operating temperature range of -40°C to +85°C. The component is housed in a compact SOT-23-5 surface-mount package.

Voltage Reference Feature Summary

• Provides stable precision voltage reference performance with low dropout capability for efficient power management.
• Designed for micropower applications with minimal quiescent current consumption to extend battery life.
• Ensures high accuracy and stability across varying temperatures through controlled temperature coefficients.

Voltage Reference Applications

• Portable instrumentation requiring precise voltage references
• Battery-powered measurement systems
• Data acquisition systems

Voltage Reference Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as TI acquired NS. Confirm the specific suffix indicates the 5.0V output variant and SOT-23-5 package. Check RoHS compliance status and ensure the part number matches the exact tolerance and temperature grade required for your design specifications before ordering.

Voltage Reference Selection Notes

Select this component when a fixed 5V reference is needed with ±0.5% initial accuracy. It is suitable for designs prioritizing low power consumption and small footprint. Ensure the input voltage remains above the minimum dropout threshold. Consider the SOT-23-5 package constraints for thermal and layout requirements in dense PCB layouts.

Voltage Reference Part Context

The LM4120 series belongs to the family of precision micropower voltage references originally developed by National Semiconductor. These devices are widely used in analog circuits where stable reference voltages are critical. The IM5-5.0 variant specifically denotes the industrial temperature grade, SOT-23 package, and 5.0V output setting within this product line.

Voltage Reference Replacement Considerations

LM4120AIM5-5.0/NOPB: Higher accuracy version (±0.2%) from Texas Instruments.

Voltage Reference FAQ

What is the maximum shunt current for the LM4120IM5-5.0?

The datasheet specifies a maximum shunt current of 5 mA for safe operation without exceeding power dissipation limits.

Does the LM4120IM5-5.0 require a minimum load current?

Yes, a minimum load current is typically required to maintain regulation, often specified in the electrical characteristics table of the datasheet.