LM4041DEM3-1.2

Overview

The LM4041DEM3-1.2 is a micropower shunt voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It provides a fixed output voltage of 1.225 V with an initial accuracy of ±0.5% at 25°C. The device operates within a temperature range of -40°C to +125°C and features a maximum temperature coefficient of 150 ppm/°C. It requires a minimum operating current of 73 µA and supports a maximum cathode current of 12 mA. The component is housed in a surface-mount SOT-23-3 package.

Feature Summary

• Provides stable reverse breakdown voltage without requiring external stabilizing capacitors
• Utilizes bandgap reference curvature correction for low dynamic impedance
• Ensures high precision through fuse and Zener-zap reverse breakdown trim during wafer sort

Applications

• Space-critical applications due to sub-miniature packaging
• Power restricted designs leveraging ultra-low operating current
• Precision measurement systems requiring stable reference voltages

Procurement Notes

Verify the manufacturer designation as Texas Instruments or National Semiconductor on the datasheet, as the brand history involves acquisition. Confirm the specific accuracy grade (±0.5%) matches the design requirements, as other grades like ±0.1% exist within the same family. Ensure the SOT-23-3 package dimensions align with the PCB footprint constraints.

Selection Notes

Select this part when a fixed 1.225 V reference is required in a compact form factor. Consider the ±0.5% initial accuracy and 150 ppm/°C temperature coefficient against system tolerance needs. Verify that the 73 µA minimum operating current is supported by the supply circuitry to maintain regulation stability under all load conditions.

Part Context

This component belongs to the LM4041-N series of precision micropower shunt voltage references. The series includes both fixed and adjustable versions available in SC-70 and SOT-23 packages. The LM4041DEM3-1.2 specifically denotes the fixed 1.225 V variant with ±0.5% accuracy in the SOT-23-3 package.

Replacement Considerations

LM4041DIM3X-1.2/NOPB: Fixed 1.225 V, ±0.1% accuracy, SOT-23 package. LM4041QBIM3-1.2/NOPB: Automotive qualified, ±0.5% accuracy, SOT-23 package.