LM4128BMFX-4.1

Voltage Reference Overview

The LM4128BMFX-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 ±0.2% 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 power management.

Voltage Reference Feature Summary

• Series topology design eliminates the need for external stabilizing capacitors while maintaining stability with capacitive loads up to 10 µF.
• Integrated enable pin allows for a low-power shutdown mode with reduced supply current consumption.
• Indefinite short-circuit protection limits output current during fault conditions without damaging the device.

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify that the ordering suffix 'X' corresponds to tape-and-reel packaging as specified in the manufacturer's documentation. Confirm the component grade matches the required accuracy specifications for the intended application. Ensure compatibility with the SOT-23-5 footprint during PCB layout. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Voltage Reference Selection Notes

Select this component when space constraints require a compact SOT-23-5 package alongside precise voltage regulation. The B-grade accuracy offers a balance between cost and performance for general-purpose applications. Consider the low quiescent current for battery-operated designs where power efficiency is critical. Verify input voltage requirements against the specified dropout characteristics.

Voltage Reference Part Context

This part belongs to the LM4128 family of precision micropower series voltage references. The family includes various grades (A, B, C, D) offering different accuracy levels and temperature coefficients. The LM4128 series is designed for applications requiring stable reference voltages in small form factors, serving as a foundational component for analog signal conditioning and measurement circuits.

Voltage Reference Replacement Considerations

LM4128AMFX-4.1

Voltage Reference FAQ

Does the LM4128BMFX-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 the Enable pin on Pin 3?

The Enable pin allows control over the device operation, enabling a shutdown mode with significantly reduced supply current when activated.