LM4051CEM3X-1.2/NOPB

Voltage Reference Overview

The LM4051CEM3X-1.2/NOPB is a precision micropower shunt voltage reference manufactured by Texas Instruments, housed in a compact SOT-23-3 surface-mount package. It provides a fixed nominal output voltage of 1.225 V with an initial accuracy of ±0.5%. The device operates within a temperature range of -40°C to +85°C and features a low temperature coefficient of 50 ppm/°C. Key electrical characteristics include a maximum cathode current of 12 mA and a typical quiescent current of 73 µA. It complies with RoHS standards and is designed for applications requiring stable voltage references in space-constrained environments.

Voltage Reference Feature Summary

• Provides a fixed 1.225 V precision reference output suitable for sensitive analog circuits.
• Features micropower operation with low quiescent current to minimize power consumption.
• Utilizes a compact SOT-23-3 package for efficient board space utilization.
• Maintains stability across industrial temperature ranges with low temperature drift.

Voltage Reference Applications

• Portable battery-powered instrumentation systems
• Data acquisition and measurement devices
• Microcontroller supply monitoring circuits
• ADC reference voltage sources

Voltage Reference Procurement Notes

Verify the specific suffix 'CEM3X' against the official Texas Instruments datasheet to confirm the exact temperature grade (-40°C to +85°C) and packaging configuration (cut tape or reel). Ensure that the 'NOPB' designation confirms lead-free and RoHS compliance as required by your assembly process. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Voltage Reference Selection Notes

Select this component when a fixed 1.225 V reference is required with ±0.5% initial accuracy. It is appropriate for designs prioritizing low power consumption and small footprint over higher current capabilities. Consider the 50 ppm/°C temperature coefficient for thermal stability requirements. Compare against LM4041 series if lower cost is acceptable, or LM4050 series if higher current drive is needed.

Voltage Reference Part Context

This part belongs to the LM4051 family of precision micropower shunt voltage references from Texas Instruments. It shares architectural similarities with the LM4041 but offers improved accuracy and performance specifications. The LM4051 series is designed to replace older discrete zener diode solutions, providing better stability and lower noise in modern electronic designs.

Voltage Reference Replacement Considerations

LM4041DEM3-1.2/NOPB: Offers similar functionality but with ±1% accuracy and 150 ppm/°C tempco. TL4051A12QDBZT: Provides higher ±0.1% accuracy and automotive qualification. LM4050CEM3X-1.2/NOPB: Higher current capability (15 mA) but different pinout compatibility may require verification.