LM4128CMFX-3.3

Voltage Reference Overview

The LM4128CMFX-3.3/NOPB is a micropower series voltage reference manufactured by Texas Instruments, housed in a SOT-23-5 surface-mount package. It provides a fixed output voltage of 3.3V with an initial accuracy of ±0.5%. The device operates within a temperature range of -40°C to +125°C and features a temperature coefficient of 100 ppm/°C. Maximum input voltage is specified at 6V, with a maximum shunt current of 20mA and a typical supply current of 60µA.

Voltage Reference Feature Summary

• Micropower operation designed for battery-powered applications
• High precision stability with low temperature drift
• Compact SOT-23-5 footprint for space-constrained designs

Voltage Reference Applications

• Portable instrumentation systems
• Battery-operated measurement devices
• Data acquisition systems requiring stable references

Voltage Reference Procurement Notes

Verify the complete part number includes the /NOPB suffix for lead-free compliance. Confirm the CM grade matches the required ±0.5% accuracy specification. Ensure the SOT-23-5 package variant aligns with PCB layout requirements. Check AEC-Q100 qualification status if automotive application is intended, as standard commercial grades may differ.

Voltage Reference Selection Notes

Select this component when a stable 3.3V reference is needed with minimal power consumption. The 100 ppm/°C coefficient suits general-purpose industrial environments. Compare against higher accuracy grades like AM or BM if tighter tolerance is required. Verify input voltage headroom exceeds 3.3V plus dropout requirements.

Voltage Reference Part Context

This part belongs to the LM4128 family of micropower series voltage references from Texas Instruments. The family offers various fixed output voltages and accuracy grades. The CM grade specifically denotes the ±0.5% initial accuracy level. The FX suffix indicates tape and reel packaging for automated assembly processes.

Voltage Reference Replacement Considerations

LM4128BMF-3.3/NOPB offers improved ±0.2% accuracy. LM4128AMF-3.3/NOPB provides ±0.1% accuracy. LM4128DMF-3.3/NOPB offers ±1% accuracy. All share identical pinouts and packages.