LM4041CEM3-1.2

Overview

The LM4041CEM3-1.2 is a micropower shunt voltage reference from Texas Instruments providing a fixed 1.225 V output. It features an initial accuracy of ±0.5% and a maximum temperature coefficient of 100 ppm/°C. The device operates within a wide current range, with a minimum operating current of 45 µA (typical) and a maximum cathode current of 12 mA. It supports industrial temperature operation from -40°C to +85°C and utilizes a SOT-23-3 surface-mount package.

Feature Summary

• Provides stable 1.225 V reference voltage with low dynamic impedance
• Operates stably with all capacitive loads without requiring external output capacitors
• Ultra-low operating current suitable for power-constrained designs
• Available in space-saving SOT-23-3 surface mount packages

Applications

• Portable applications requiring space saving and low power consumption
• Battery-powered systems utilizing micropower characteristics
• Precision measurement circuits requiring stable reference voltages
• Data acquisition systems needing low noise performance

Procurement Notes

Verify the specific suffix 'CEM3' against official datasheets to confirm it denotes the standard C-grade (±0.5%) variant within the LM4041 family. Ensure the ordering part number matches the required temperature range and package type. Confirm RoHS compliance status as per the manufacturer's latest documentation before procurement.

Selection Notes

Select this component when a fixed 1.225 V reference is required in a compact SOT-23-3 footprint. It is suitable for applications demanding low quiescent current and stability across varying capacitive loads. Consider the ±0.5% tolerance and 100 ppm/°C drift if higher precision grades like A or B are not necessary for the design.

Part Context

The LM4041 belongs to the LM4040/LM4041 series of precision micropower shunt voltage references by Texas Instruments. These devices utilize bandgap reference technology with curvature correction to ensure accuracy over wide temperature and current ranges. The series offers various accuracy grades and package options to support diverse electronic design requirements.

Replacement Considerations

LM4041DEM3-1.2/NOPB: Extended temperature version (+125°C). LM4041A12IDBZR: Higher precision grade (±0.1%). LM4041B12IDBZR: Intermediate precision grade (±0.2%). Verify pinout and thermal specifications when substituting.