LM4128AMFX-4.1

Voltage Reference Overview

The LM4128AMFX-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 operation.

Voltage Reference Feature Summary

• Series topology architecture eliminates the need for external stabilizing capacitors while maintaining stability with capacitive loads up to 10 µF.
• Integrated enable pin allows for low-power shutdown mode with reduced supply current consumption.
• Indefinite short-circuit protection limits output current to prevent damage during fault conditions.

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and reel quantity. Confirm that the component meets all required environmental and reliability standards for the intended application before finalizing procurement decisions.

Voltage Reference Selection Notes

Select this component when space-constrained designs require a high-accuracy series reference. The low dropout voltage and micropower consumption make it suitable for battery-operated applications where minimizing quiescent current is critical.

Voltage Reference Part Context

This part belongs to the LM4128 family of precision voltage references. The 'A' grade designation indicates the highest accuracy tier within the series, offering tighter tolerances compared to B, C, or D grades. The 'X' suffix denotes the tape-and-reel packaging format.

Voltage Reference Replacement Considerations

LM4128BMFX-4.1

Voltage Reference FAQ

Does the LM4128AMFX-4.1 require an external capacitor for stability?

No, the advanced design eliminates the need for an external stabilizing capacitor, though an input capacitor is recommended for noise reduction.

What is the minimum input voltage required for proper operation?

The input voltage must be at least VREF plus 400 mV (dropout voltage) under typical load conditions.