LM4128AQ1MFX2.5/NOPB

Voltage Reference Overview

The LM4128AQ1MFX2.5/NOPB is an automotive-grade series precision voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 2.5 V with an initial accuracy of 0.1% and a temperature coefficient of 75 ppm/°C. The device operates within an input voltage range up to 6 V and supports a maximum shunt current of 20 mA. It consumes a typical supply current of 60 µA and functions reliably across a junction temperature range of -40°C to +125°C. Packaged in a compact SOT-23-5 surface-mount case, it meets AEC-Q100 qualification standards for automotive applications.

Voltage Reference Feature Summary

• Automotive-grade reliability certified under AEC-Q100 standards
• High precision with 0.1% initial accuracy and low temperature drift
• Ultra-low power consumption suitable for battery-operated systems
• Compact SOT-23-5 package for space-constrained designs

Voltage Reference Applications

• Automotive sensor signal conditioning
• Data acquisition systems requiring stable reference voltages
• Portable medical instrumentation
• Industrial process control loops

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance as per manufacturer specifications. Confirm the 'Q1' designation aligns with required automotive qualification standards for your application environment. Ensure the 'FX' suffix matches the reel packaging format needed for your assembly line equipment. Cross-reference the full part number against official Texas Instruments documentation to confirm current production status and availability.

Voltage Reference Selection Notes

Select this component when high precision and automotive reliability are critical requirements. The 0.1% accuracy ensures minimal calibration needs in sensitive measurement circuits. The low quiescent current extends battery life in portable devices. Consider the SOT-23-5 footprint constraints during PCB layout. Verify that the 2.5 V output level matches the input requirements of downstream analog-to-digital converters or amplifiers.

Voltage Reference Part Context

This part belongs to the LM4128 family of micropower shunt voltage references. The LM4128 series offers various fixed output voltages and accuracy grades. The AQ1 variant specifically targets automotive markets, providing enhanced thermal stability and robustness compared to standard industrial versions. It serves as a drop-in replacement for older reference designs requiring higher precision and lower power consumption.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4128 variants with different output voltages or accuracy grades, such as LM4128AQ1MF3.0/NOPB or LM4128AQ1MF2.0/NOPB, provided the voltage requirement differs. Non-series replacements require careful evaluation of pin compatibility and thermal performance.