LM4128CMFX-4.1

Voltage Reference Overview

The LM4128CMFX-4.1 is a precision micropower series voltage reference manufactured by Texas Instruments, housed in an SOT-23-5 surface-mount package. It provides a fixed output voltage of 4.096 V with an initial accuracy of ±0.5% and a maximum temperature coefficient of 100 ppm/°C. The device operates within a junction temperature range of -40°C to +125°C and features a typical supply current of 60 µA. It supports up to 20 mA of load current and includes an enable pin for shutdown mode.

Voltage Reference Feature Summary

• Micropower series architecture designed for low quiescent current consumption
• Integrated enable pin allows for active shutdown control
• Capable of driving capacitive loads up to 10 µF without external stabilization
• Indefinite short-circuit protection limits output current

Voltage Reference Applications

• Battery-powered portable equipment
• Data acquisition systems
• Precision regulators
• Medical equipment

Voltage Reference Procurement Notes

Verify the specific suffix 'CMFX' corresponds to the C-grade (0.5% accuracy) variant with tape-and-reel packaging. Confirm that the 'NOPB' designation indicates lead-free and RoHS compliance if required by the assembly process. Ensure the input voltage exceeds the reference voltage plus the specified dropout voltage under expected load conditions.

Voltage Reference Selection Notes

Select this component when space constraints require an SOT-23-5 footprint and a 4.096 V reference is needed. The C-grade specification offers a balance between cost and performance for general-purpose applications. Consider the 60 µA supply current for battery life calculations and verify that the 20 mA output capability meets the system's peak load requirements.

Voltage Reference Part Context

This part belongs to the LM4128 family of precision voltage references from Texas Instruments. The family includes various grades (A, B, C, D) offering different accuracy and temperature coefficient specifications. The LM4128 series is designed as a low-power alternative to shunt references, eliminating the need for idle current draw at no load.

Voltage Reference Replacement Considerations

LM4128AMFX-4.1/NOPB

Voltage Reference FAQ

Does the LM4128CMFX-4.1 require an external stabilizing capacitor?

No, the advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with capacitive loads up to 10 µF.

What is the function of Pin 3 on the LM4128CMFX-4.1?

Pin 3 is the Enable (EN) pin, which allows the device to be placed into a low-power shutdown mode.