LM4128DMFX-4.1

Voltage Reference Overview

The LM4128DMFX-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 nominal output voltage of 4.096 V with an initial accuracy of 1.0% 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 a maximum load current of 20 mA and includes an enable pin for power management.

Voltage Reference Feature Summary

• Micropower series architecture designed for low quiescent current consumption
• Integrated enable pin allowing for a dedicated shutdown mode
• Capable of driving capacitive loads up to 10 µF without external stabilization
• Indefinite short-circuit protection limits output current during faults

Voltage Reference Applications

• Portable and battery-powered equipment
• Data acquisition systems
• Precision regulators
• Medical equipment
• Instrumentation and process control

Voltage Reference Procurement Notes

Verify the specific suffix 'X' indicates tape and reel packaging configuration. Confirm the 'D' grade designation corresponds to the required 1.0% accuracy and 100 ppm/°C temperature coefficient specifications. Ensure the SOT-23-5 footprint matches the target PCB layout constraints.

Voltage Reference Selection Notes

Select this component when space efficiency is critical due to the compact SOT-23-5 form factor. Choose this part if the application requires a fixed 4.096 V reference with moderate accuracy requirements suitable for general-purpose instrumentation. Consider the low dropout voltage characteristics for battery-operated designs where input voltage headroom is limited.

Voltage Reference Part Context

This device belongs to the LM4128 family of precision voltage references from Texas Instruments. The family offers various grades (A, B, C, D) providing different combinations of accuracy and temperature stability. The LM4128 series is engineered to eliminate the need for external stabilizing capacitors while maintaining stability with significant capacitive loads.

Voltage Reference Replacement Considerations

LM4128AMFX-4.1/NOPB

Voltage Reference FAQ

Does the LM4128DMFX-4.1 require an external capacitor for stability?

No, the advanced design eliminates the need for an external stabilizing capacitor, though it remains stable with capacitive loads up to 10 µF.

What is the function of Pin 3 on the LM4128DMFX-4.1?

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