LM4128CQ1MFX2.5/NOPB

Voltage Reference Overview

The LM4128CQ1MFX2.5/NOPB is an automotive-grade series precision voltage reference IC manufactured by Texas Instruments. It provides a fixed output voltage of 2.5 V with an initial accuracy of ±0.5%. The device operates within a supply voltage range of 3.4 V to 5.5 V and supports a maximum shunt current of 20 mA. It features a temperature coefficient of 100 ppm/°C and consumes 100 µA of supply current. The component is qualified to AEC-Q100 standards, ensuring reliability for automotive applications across an operating temperature range of -40°C to +125°C.

Voltage Reference Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for enhanced reliability in vehicle environments.
• High precision series voltage reference architecture delivering stable output with low temperature drift.
• Micropower operation capability supporting battery-powered systems through low quiescent current consumption.

Voltage Reference Applications

• Automotive sensor signal conditioning circuits requiring precise voltage references.
• Data acquisition systems utilizing analog-to-digital converters (ADCs) for accurate measurement.
• Microcontroller power management interfaces providing stable reference voltages for internal regulators.

Voltage Reference Procurement Notes

Verify the specific suffix 'C' indicates the ±0.5% accuracy grade distinct from other variants like 'A' or 'B'. Confirm the 'Q1' designation aligns with required automotive qualification standards for your application. Ensure the 'MF' package code matches your PCB footprint requirements for SOT-23-5 mounting. Cross-reference the full part number against official Texas Instruments documentation to confirm availability and revision status before finalizing procurement.

Voltage Reference Selection Notes

Select this component when automotive certification is mandatory and a 2.5 V reference is needed. Choose this variant over higher accuracy models if cost sensitivity allows for ±0.5% tolerance. Consider the 100 ppm/°C temperature coefficient against environmental thermal conditions. Verify input voltage constraints fit within the 3.4 V to 5.5 V operational window for your specific power rail configuration.

Voltage Reference Part Context

This part belongs to the LM4128 family of micropower shunt voltage references designed for high-precision applications. The LM4128 series offers various accuracy grades and output voltages, with the CQ1 variant specifically tailored for automotive durability. It complements other PMIC solutions by providing a stable reference point for linear regulators and data conversion stages in complex electronic systems.

Voltage Reference Replacement Considerations

LM4128AQ1MFX2.5/NOPB: Offers higher initial accuracy (±0.1%) but may differ in cost. LM4128BQ1MFX2.5/NOPB: Provides intermediate accuracy (±0.2%). Non-automotive equivalents like LM4128CIMF-2.5 lack AEC-Q100 qualification. Verify pinout compatibility and thermal performance when substituting.