LM4040CEM3-2.1

Overview

The LM4040CEM3-2.1 is a precision micropower shunt voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 2.1V (specifically 2.048V in standard series, though listed as 2.1V in specific distributor data for this suffix variant context) 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. It is housed in a compact SOT-23-3 surface-mount package, designed for space-critical applications requiring stable voltage referencing.

Feature Summary

• Precision bandgap voltage reference architecture
• Micropower consumption suitable for battery operation
• Compact SOT-23-3 surface-mount packaging

Applications

• Space-critical electronic designs
• Battery-powered measurement systems
• Portable instrumentation voltage references

Procurement Notes

Verify the exact output voltage specification against the official datasheet, as distributor listings may vary between 2.048V and 2.1V designations for similar suffixes. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as regulatory markings can change. Ensure the SOT-23-3 footprint matches your PCB layout requirements before finalizing procurement decisions.

Selection Notes

Select this component when a stable, low-drift voltage reference is required in a minimal footprint. The 0.5% initial accuracy and low temperature coefficient make it suitable for moderate-precision analog circuits. Consider the shunt configuration requirements and ensure adequate current limiting resistors are included in the design to maintain operation within the specified current range.

Part Context

The LM4040 series is a family of precision micropower shunt voltage references available in various fixed output voltages. This specific part belongs to the C-grade accuracy subset, offering tighter tolerances than lower grades. The Maxim Integrated brand heritage ensures compatibility with established design libraries and application notes from Analog Devices.

Replacement Considerations

Check for direct pin-compatible alternatives within the LM4040 family with different voltage outputs if system requirements change. Verify thermal performance and current handling capabilities of any substitute components to ensure they meet the original design's power dissipation constraints.