LM4128CMF-2.5

Voltage Reference Overview

The LM4128CMF-2.5/NOPB is a precision micropower series voltage reference from Texas Instruments, housed in a SOT-23-5 package. It delivers a fixed output of 2.5 V with an initial accuracy of 0.5%. The device operates within a supply voltage range of 3.7 V to 5.5 V and supports a maximum shunt current of 20 mA. Key electrical characteristics include a temperature coefficient of 100 ppm/°C and a noise level of 310 µVp-p (0.1 Hz to 10 Hz). It functions reliably across an extended temperature range of -40°C to +125°C.

Voltage Reference Feature Summary

• Provides stable series voltage regulation with high precision for sensitive analog circuits.
• Features ultra-low power consumption suitable for battery-operated applications.
• Delivers low noise performance to maintain signal integrity in measurement systems.

Voltage Reference Applications

• Handheld meters and portable instrumentation
• Battery-powered data acquisition systems
• Microprocessor supervisory circuits

Voltage Reference Procurement Notes

Verify the complete part number includes the /NOPB suffix to ensure compliance with RoHS standards and lead-free manufacturing processes. Confirm the specific output voltage variant matches the design requirement, as the LM4128 family offers multiple fixed voltage options. Ensure the SOT-23-5 footprint aligns with the PCB layout specifications before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a fixed 2.5 V reference is required with moderate precision and low quiescent current. Compare against the LM4030 series if lower noise or higher accuracy is needed, noting that the LM4030 is a shunt reference requiring different circuit topology. Consider the LM4128AQ1 variant if automotive qualification under AEC-Q100 is mandatory for the application environment.

Voltage Reference Part Context

This device belongs to the LM4128 family of precision micropower series voltage references designed by Texas Instruments. The family provides various fixed output voltages in a compact SOT-23-5 package, targeting space-constrained and power-sensitive electronic designs. It serves as a standard reference solution for general-purpose analog signal conditioning tasks.

Voltage Reference Replacement Considerations

LM4128CMF-2.5/NOPB is functionally equivalent to LM4128BMF-2.5/NOPB, differing primarily in initial accuracy grades. Direct pin-to-pin replacements within the same manufacturer's series should be verified for temperature coefficient and noise specifications.