LM4050CIM3X-4.1

Voltage Reference Overview

The LM4050CIM3X-4.1/NOPB is a precision micropower shunt voltage reference manufactured by Texas Instruments, succeeding the National Semiconductor lineage. It provides a fixed output voltage of 4.096 V with an initial accuracy of 0.5% and a temperature coefficient of 50 ppm/°C. The device operates within a wide current range of 60 µA to 15 mA and functions reliably across an extended temperature range from -40°C to +125°C. Packaged in a compact SOT-23-3 surface-mount format, it eliminates the need for external stabilizing capacitors while maintaining stability with any capacitive load.

Voltage Reference Feature Summary

• Provides stable reverse breakdown voltage accuracy over a wide operating current range without requiring external stabilizing capacitors.
• Features laser-trimmed resistors to ensure high initial accuracy and low dynamic impedance.
• Designed for space-critical applications with a subminiature three-pin surface-mount package.

Voltage Reference Applications

• Portable battery-powered instrumentation
• Handheld meters
• Data acquisition systems

Voltage Reference Procurement Notes

Verify that the ordering suffix /NOPB indicates lead-free and RoHS compliance, as this distinguishes the current production version from older non-compliant variants. Confirm the specific accuracy grade (C) matches the design requirement of 0.5% initial tolerance. Ensure the SOT-23-3 footprint aligns with the PCB layout specifications before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a 4.096 V reference is required with moderate precision (0.5%) and wide temperature operation up to 125°C. It serves as a direct replacement for legacy National Semiconductor parts in existing designs. Consider the LM4050AIM3X-4.1 if tighter 0.1% accuracy is necessary, or the LM4050BIM3X series for lower temperature coefficients if thermal stability is the primary constraint.

Voltage Reference Part Context

This part belongs to the LM4050 family of two-terminal shunt voltage references originally developed by National Semiconductor and now produced by Texas Instruments following their merger. The family offers multiple fixed reverse breakdown voltages including 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. The LM4050 series is characterized by its micropower consumption and ability to operate without output capacitors.

Voltage Reference Replacement Considerations

The LM4050CIM3X-4.1/NOPB is the direct lead-free and RoHS-compliant successor to the LM4050CIM3X-4.1. For pin-compatible alternatives with different accuracy grades, consider the LM4050AIM3X-4.1 (0.1% accuracy) or LM4050DIM3X-4.1 (1% accuracy). Verify that substitute parts maintain the same SOT-23-3 package and electrical characteristics.