LM4040EIMX-2.5

Overview

The LM4040EIMX-2.5 is a micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 2.5 V with an initial accuracy of ±0.2%. The device operates within a temperature range of -40°C to +85°C and features a maximum temperature coefficient of 100 ppm/°C. Designed for space-constrained applications, it utilizes the SOT-23-3 surface-mount package. The component supports a maximum shunt current of 15 mA and maintains stability under capacitive loads.

Feature Summary

• Provides stable reference voltage across industrial temperature ranges
• Ultra-low operating current suitable for power-restricted designs
• Capable of driving capacitive loads without instability

Applications

• Portable instrumentation circuits
• Battery-powered measurement systems
• Data acquisition systems requiring precise voltage references

Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as the company was acquired. Confirm the specific suffix 'E' indicates the 0.2% accuracy grade and 'IMX' denotes the SOT-23-3 tape-and-reel packaging. Ensure the datasheet matches the intended thermal and electrical specifications for the application environment.

Selection Notes

Select this component when a compact surface-mount solution is required for precision voltage referencing. The 0.2% accuracy offers a balance between cost and performance for general-purpose applications. Consider the low quiescent current if battery life is a critical design constraint compared to higher precision but higher current alternatives.

Part Context

This component belongs to the LM4040 series of micropower shunt voltage references. The series includes various accuracy grades (A, B, C, D) and output voltages (2.048V, 2.5V, 3.0V, 4.096V, 5.0V). The LM4040 family is designed to replace bulkier Zener diodes in modern electronic designs requiring higher stability and lower noise.

Replacement Considerations

LM4040BIM3-2.5/NOPB: Offers identical 2.5V output and SOT-23-3 package with 0.2% accuracy. LM4040AIM3-2.5/NOPB: Provides higher 0.1% accuracy in the same package. LM4040DISO-2.5: A SOIC-8 alternative for through-hole or larger board space requirements.