LM4128CMF-3.3

Voltage Reference Overview

The LM4128CMF-3.3/NOPB is a micropower series voltage reference IC manufactured by Texas Instruments, housed in a compact SOT-23-5 surface-mount package. It provides a fixed output voltage of 3.3V with an initial accuracy of ±0.5% and a temperature coefficient of 100 ppm/°C. The device operates within an input voltage range of 3.7V to 5.5V and supports a maximum shunt current of 20 mA while consuming only 100 µA of supply current. It is qualified for operation across an extended temperature range from -40°C to +125°C.

Voltage Reference Feature Summary

• Micropower consumption design enabling efficient operation in battery-powered applications
• High precision stability with low temperature drift characteristics
• Compact SOT-23-5 footprint suitable for space-constrained PCB layouts

Voltage Reference Applications

• Portable instrumentation requiring stable reference voltages
• Battery-operated measurement systems
• Data acquisition systems needing precise analog references

Voltage Reference Procurement Notes

Verify the complete part number includes the /NOPB suffix to ensure lead-free compliance and specific packaging configuration. Confirm the CMF grade matches the required ±0.5% accuracy tolerance for your circuit design. Ensure input voltage remains within the specified 3.7V to 5.5V range to maintain regulation. Check thermal management requirements given the small SOT-23-5 package size during high-current operation.

Voltage Reference Selection Notes

Select this component when a stable 3.3V reference is needed with moderate precision (±0.5%) and ultra-low power consumption. It is suitable for designs where board space is limited due to the SOT-23-5 package. Consider alternatives if higher accuracy or lower temperature coefficients are required, as this model offers standard precision performance optimized for micropower efficiency rather than high-end metrology.

Voltage Reference Part Context

This device belongs to the LM4128 family of micropower series voltage references from Texas Instruments. The family offers various output voltages and accuracy grades, all sharing the same low-power architecture and compact SOT-23-5 form factor. The LM4128 series is designed to replace larger, higher-power zener-based references in modern portable electronics.

Voltage Reference Replacement Considerations

LM4128DMF-3.3/NOPB offers similar specifications but may differ in initial accuracy grading. LM4128BMF-3.3/NOPB provides tighter ±0.2% accuracy if higher precision is required. LM4128AMF-3.3/NOPB delivers even higher precision at ±0.1%. All variants share the same pinout and package.