LM4128AMF-4.1

Voltage Reference Overview

The LM4128AMF-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 ±0.1% and a maximum temperature coefficient of 75 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 shutdown mode.

Voltage Reference Feature Summary

• Series topology eliminates the need for external stabilizing capacitors while ensuring stability with capacitive loads up to 10 µF.
• Low quiescent current consumption of 60 µA combined with low dropout voltage suitable for battery-powered applications.
• Integrated enable pin allows for a low-power shutdown mode with supply current reduced to approximately 3 µA.
• Indefinite short-circuit protection limits output current to 75 mA when the output is shorted to ground.

Voltage Reference Applications

• Precision regulators
• Data acquisition systems
• Portable, battery-powered equipment
• Test equipment

Voltage Reference Procurement Notes

Verify the specific suffix 'MF' indicates tape and reel packaging containing 1000 units, distinct from the 'MFX' variant which contains 3000 units. Confirm that the component corresponds to the A grade specifications regarding accuracy and temperature coefficient. Ensure the sourcing channel provides documentation verifying the part originates from National Semiconductor or Texas Instruments manufacturing lines.

Voltage Reference Selection Notes

Select this component when a fixed 4.096 V reference is required in space-constrained designs utilizing the SOT-23-5 footprint. The A grade offers superior initial accuracy compared to B, C, or D grades. Consider the 60 µA supply current for power-sensitive applications. Verify input voltage requirements exceed the output voltage plus the specified dropout voltage under expected load conditions.

Voltage Reference Part Context

This device belongs to the LM4128 family of precision micropower series voltage references. The family includes variants with different output voltages ranging from 1.8 V to 4.096 V and multiple accuracy grades (A, B, C, D). The LM4128 series is designed to replace traditional shunt references in applications requiring lower power consumption and higher precision in small packages.

Voltage Reference Replacement Considerations

LM4128BMF-4.1

Voltage Reference FAQ

Does the LM4128AMF-4.1 require an external capacitor for stability?

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

What is the function of Pin 3 on the LM4128AMF-4.1?

Pin 3 is the Enable (EN) pin. It utilizes an internal pull-up current source and can be used to trigger a shutdown mode with reduced supply current.