LM4128BQ1MF2.5/NOPB

Voltage Reference Overview

The LM4128BQ1MF2.5/NOPB is an automotive-grade precision micropower series voltage reference by Texas Instruments, housed in a SOT-23-5 package. It delivers a fixed output voltage of 2.5 V with an initial accuracy of 0.2%. The device features a temperature coefficient of 75 ppm/°C and supports a maximum input voltage of 6 V. It operates within a junction temperature range of -40°C to +125°C and draws a typical supply current of 60 µA. Qualified under AEC-Q100 standards, it offers a maximum shunt current of 20 mA, making it suitable for space-constrained automotive applications requiring stable reference voltages.

Voltage Reference Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliable operation in vehicle environments.
• Micropower design utilizing only 60 µA supply current to minimize energy consumption in battery-powered systems.
• Precision series regulation architecture ensures stable output voltage with low temperature drift characteristics.

Voltage Reference Applications

• Analog-to-digital converter (ADC) reference sources in automotive instrumentation.
• Data acquisition systems requiring high stability across wide temperature ranges.
• Portable medical devices and industrial sensors needing precise voltage benchmarks.

Voltage Reference Procurement Notes

Verify the complete part number including the suffix /NOPB to confirm lead-free status and compliance with RoHS directives. Ensure the ordering code matches the specific output voltage variant and accuracy grade required for your circuit design. Confirm that the SOT-23-5 package footprint aligns with your PCB layout specifications before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when automotive reliability and low power consumption are critical priorities. The 0.2% initial accuracy provides sufficient precision for most general-purpose analog circuits. Consider the 6 V maximum input limit and 20 mA shunt current capability when designing biasing networks. This part is ideal for applications where board space is limited but stable voltage references are mandatory.

Voltage Reference Part Context

This device belongs to the LM4128 family of precision voltage references, which includes various output voltage options and accuracy grades. The BQ1 suffix indicates automotive qualification and specific accuracy tiers within the series. The MF designation specifies the surface-mount SOT-23-5 packaging format. Other variants in the family offer different output voltages such as 1.8 V, 2.048 V, and 3.3 V to suit diverse system requirements.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4128 variants with matching output voltages and accuracy grades, such as LM4128AQ1MF2.5/NOPB for higher accuracy or LM4128BQ1MFX2.5/NOPB for reel packaging. Non-series replacements require careful evaluation of pin compatibility, thermal performance, and long-term stability metrics to ensure circuit functionality remains unaffected.