LM4128AQ1MFX3.3/NOPB

Voltage Reference Overview

The LM4128AQ1MFX3.3/NOPB is an automotive-grade series precision voltage reference manufactured by Texas Instruments, designed for high-reliability applications requiring stable output voltages. This specific variant provides a fixed nominal output of 3.3 V with an initial accuracy tolerance of ±0.1%, ensuring precise voltage regulation across varying conditions. It operates within a supply voltage range of 3.7 V to 5.5 V and supports a maximum shunt current of 20 mA. The device features a temperature coefficient of 75 ppm/°C, maintaining stability over the extended industrial temperature range of -40°C to +125°C TJ. Packaged in a compact SOT-23-5 surface-mount footprint, it consumes a typical supply current of 100 µA. The component is AEC-Q100 qualified, confirming its suitability for demanding automotive electronic environments.

Voltage Reference Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for enhanced reliability in vehicle electronics.
• High precision performance with ±0.1% initial accuracy and low temperature drift of 75 ppm/°C.
• Ultra-low power consumption with a typical operating current of 100 µA for energy-efficient designs.
• Compact SOT-23-5 surface-mount package optimized for space-constrained printed circuit board layouts.

Voltage Reference Applications

• Automotive infotainment systems requiring stable reference voltages for analog-to-digital conversion.
• Instrumentation and sensor signal conditioning circuits in automotive environments.
• Microcontroller peripheral interfaces needing precise voltage references for accurate operation.
• Battery management systems utilizing voltage monitoring and control functions.

Voltage Reference Procurement Notes

Verify that the ordering suffix matches the exact required output voltage and packaging configuration. Confirm that the component meets AEC-Q100 qualification requirements for your specific automotive application tier. Ensure the thermal management design accommodates the specified junction temperature range during operation. Cross-reference the datasheet specifications against your system's input voltage and load current constraints to guarantee compatibility.

Voltage Reference Selection Notes

Select this component when automotive reliability and high precision are critical for voltage reference needs. Consider the 3.3 V output level and ±0.1% accuracy for applications requiring tight voltage tolerances. Evaluate the 100 µA supply current against power budget constraints in battery-operated or low-power automotive subsystems. The SOT-23-5 package offers a balance between size and thermal performance for dense PCB designs.

Voltage Reference Part Context

The LM4128 series represents Texas Instruments' portfolio of micropower series voltage references engineered for precision applications. The AQ1 designation indicates automotive-grade qualification, distinguishing it from commercial variants. This family is part of the broader PMIC category, providing essential stable voltage sources for analog and mixed-signal circuits. The LM4128AQ1MFX3.3/NOPB specifically targets the 3.3 V segment, offering a reliable solution for modern automotive electronics requiring robust performance under harsh environmental conditions.

Voltage Reference Replacement Considerations

LM4128AQ1MF3.3/NOPB