LM4040DEX3-2.1

Overview

The LM4040DEX3-2.1 is a 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 70 ppm/°C. It supports a maximum shunt current of 15 mA and utilizes an SC-70-3 surface-mount package.

Feature Summary

• Provides stable reference voltage across industrial temperature ranges
• Designed for space-constrained applications via compact packaging
• Operates with ultra-low quiescent current for power efficiency

Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Temperature sensing circuits

Procurement Notes

Verify the specific suffix 'D' indicates 1% initial accuracy and the '-2.1' denotes the 2.1 V output variant. Confirm the 'EX3' suffix corresponds to the SC-70-3 package type as specified in official Maxim Integrated documentation. Ensure compliance with RoHS directives if required for the target application environment.

Selection Notes

Select this component when a 2.1 V reference is specifically required, as standard variants typically offer 2.048 V or 2.5 V. The 1% accuracy class suits general-purpose applications where tighter tolerances are unnecessary. Consider the SC-70-3 footprint constraints against available PCB real estate during the design phase.

Part Context

This part belongs to the LM4040 family of precision micropower shunt voltage references. The family offers various accuracy grades (A, B, C, D) and output voltages. The LM4040 series is characterized by low noise and stability under capacitive loads, making it suitable for diverse analog signal conditioning tasks.

Replacement Considerations

LM4040CIZ-2.0/NOPB serves as a functional equivalent from Texas Instruments, offering similar 2.048 V performance in different packaging.