LM4128CQ1MFX3.3/NOPB

Voltage Reference Overview

The LM4128CQ1MFX3.3/NOPB is an automotive-grade series voltage reference IC manufactured by Texas Instruments, designed for precision applications requiring stable output voltages in harsh environments. It provides a fixed 3.3 V output with an initial accuracy of ±0.5% and a temperature coefficient of 100 ppm/°C. The device operates within an input voltage range of 3.4 V to 5.5 V and supports a maximum shunt current of 20 mA while consuming only 100 µA of supply current. It is qualified under AEC-Q100 standards 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 offers low noise performance suitable for sensitive analog circuits.

Voltage Reference Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliability in vehicle electronics
• Precision series regulation architecture ensuring stable output voltage under varying load conditions
• Compact SOT-23-5 surface-mount package optimized for space-constrained PCB layouts

Voltage Reference Applications

• Automotive sensor signal conditioning circuits
• Data acquisition systems requiring precise voltage references
• Microcontroller power management and ADC reference inputs

Voltage Reference Procurement Notes

Verify the complete part number including suffixes such as 'NOPB' and 'MFX' to ensure correct packaging and lead-free compliance. Confirm that the specific grade (C) matches the required accuracy specifications for your design. Check for RoHS3 compliance status during procurement. Ensure the supplier source is authorized to guarantee component authenticity and traceability for automotive applications.

Voltage Reference Selection Notes

Select this component when a fixed 3.3 V reference with ±0.5% initial accuracy is required for automotive or industrial use. Consider the 100 ppm/°C temperature coefficient against stricter requirements that might necessitate higher grades like the B or A variants. Evaluate the 100 µA quiescent current against battery life constraints. Ensure the SOT-23-5 footprint aligns with existing board designs and thermal management capabilities.

Voltage Reference Part Context

This part belongs to the LM4128 family of precision shunt voltage references from Texas Instruments. The 'C' designation indicates a ±0.5% initial accuracy tier, distinct from the tighter ±0.1% (A) and ±0.2% (B) grades. The 'Q1' suffix denotes automotive qualification, while 'MFX' specifies tape-and-reel packaging. The 'NOPB' suffix confirms lead-free and RoHS-compliant construction, distinguishing it from older non-compliant versions.

Voltage Reference Replacement Considerations

LM4128AQ1MF3.3/NOPB: Offers tighter ±0.1% accuracy. LM4128BQ1MF3.3/NOPB: Provides ±0.2% accuracy. LM4128CQ1MF3.0/NOPB: Same accuracy but 3.0 V output. Verify pinout compatibility and thermal characteristics before substitution.