LM4040EEM3-2.0

Overview

The LM4040EEM3-2.0 is a precision micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 2.048 V with an initial accuracy of 1%. The device operates within an industrial temperature range from -40 °C to +85 °C and features a maximum temperature coefficient of 150 ppm/°C. Designed for space-constrained applications, it utilizes the SOT-23 surface-mount package. The component supports a maximum shunt current of 15 mA and maintains stability under various load conditions.

Feature Summary

• Provides stable reference voltage across industrial temperature ranges
• Ultra-low operating current suitable for power-restricted designs
• Compact SOT-23 package for space-saving integration

Applications

• Portable battery-powered equipment requiring low quiescent current
• Data acquisition systems needing precise voltage references
• Handheld instruments and meters

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments, noting the corporate acquisition history. Confirm the specific suffix 'EEM3' corresponds to the 1% accuracy grade and SOT-23 packaging. Ensure the 'NOPB' designation is present if lead-free compliance is required for the specific procurement batch. Cross-reference the datasheet revision to ensure compatibility with current design specifications.

Selection Notes

Select this component when a 2.048 V reference with 1% initial accuracy is sufficient for the application. It is appropriate for designs prioritizing low power consumption over ultra-high precision. Consider the 150 ppm/°C temperature coefficient against environmental thermal variations. Verify that the SOT-23 footprint aligns with the PCB layout constraints and that the 15 mA max shunt current meets the circuit's biasing requirements.

Part Context

This part belongs to the LM4040 series of micropower shunt voltage references. The series offers various output voltages including 2.048 V, 2.5 V, 3.0 V, 4.096 V, and 5.0 V. Accuracy grades range from 0.1% to 1%, with corresponding suffixes such as A, B, C, and D. The E grade specifically denotes the 1% tolerance level. The family is designed for high stability and low noise in compact packages like SOT-23 and SOT-323.

Replacement Considerations

Publicly confirmed alternate part numbers include LM4040DEM3-2.0/NOPB. Designers should verify pinout compatibility and electrical parameter equivalence before substitution.