LM4040DEM3-2.1

Overview

The LM4040DEM3-2.1 is a precision micropower shunt voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 2.1 V with an initial accuracy of 1%. The device operates within a temperature range of -40°C to +85°C and features a maximum temperature coefficient of 150 ppm/°C. It supports a maximum shunt current of 15 mA and utilizes an SOT-23 surface-mount package.

Feature Summary

• Provides stable fixed output voltage across industrial temperature ranges
• Designed for space-constrained applications using compact SOT-23 packaging
• Operates with low quiescent current suitable for power-limited designs

Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Handheld measurement devices

Procurement Notes

Verify the specific suffix 'DEM3' against official manufacturer documentation, as this designation often indicates a non-recommended-for-new-designs (NRND) status or specific legacy configuration. Confirm availability through authorized distributors, as stock levels may be limited due to end-of-life considerations. Ensure the 2.1V output variant matches the circuit requirements before procurement.

Selection Notes

Select this component when a 2.1V reference is required in a small SOT-23 footprint. The 1% accuracy and 150 ppm/°C temperature coefficient are less stringent than higher-grade variants like the LM4040A series. This part is suitable for general-purpose applications where extreme precision is not critical but size and cost efficiency are priorities.

Part Context

This component belongs to the LM4040 family of micropower shunt voltage references. The family offers various output voltages including 2.048V, 2.5V, and 5.0V, with different accuracy grades denoted by suffixes such as A, B, C, and D. The DEM3 suffix specifically identifies the 2.1V output version in the SOT-23 package.

Replacement Considerations

Official documentation for the LM4040DEM3-50 variant suggests the LM4040DEM3-5.0/NOPB as an alternate. For the 2.1V version, verify if LM4040DEM3-2.1/NOPB is available as a direct replacement. Cross-reference with other LM4040 series parts offering similar voltage and package constraints.