LM4040C20ILPR

Overview

The LM4040C20ILPR is a precision micropower shunt voltage reference manufactured by Texas Instruments, operating within an industrial temperature range of -40°C to +85°C. It provides a fixed output voltage of 2.048 V with an initial accuracy tolerance of ±0.5%. The device features a maximum temperature coefficient of 100 ppm/°C and exhibits low noise characteristics, specified as 35 µVrms in the 10 Hz to 10 Hz bandwidth. It operates with a cathode current of 80 µA and supports a maximum output current of 15 mA. The component is housed in a TO-92-3 through-hole package.

Feature Summary

• Provides stable fixed output voltage across the industrial temperature range
• Ultra-low operating current suitable for power-restricted designs
• High precision accuracy with low temperature coefficient
• Capable of driving capacitive loads while maintaining stability

Applications

• Portable instrumentation requiring low power consumption
• Battery-powered measurement systems
• Data acquisition systems needing precise voltage references
• Handheld devices with space constraints

Procurement Notes

Verify the manufacturer designation on official documentation, as the component is currently produced by Texas Instruments rather than National Semiconductor. Confirm the specific suffix 'ILPR' corresponds to the TO-92-3 package and the C20 variant indicates the 2.048 V output with ±0.5% accuracy. Ensure compliance with RoHS standards if required for the target application environment.

Selection Notes

Select this component when a fixed 2.048 V reference is required with high accuracy and low quiescent current. The TO-92-3 package is appropriate for through-hole assembly where board space allows. Consider the 100 ppm/°C temperature coefficient for applications operating within the -40°C to +85°C range. Evaluate the 35 µVrms noise specification against system sensitivity requirements.

Part Context

This part belongs to the LM4040 family of precision micropower shunt voltage references. The family 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 the 'C' grade denoting ±0.5% tolerance. The series is designed for applications demanding stability and low power operation in compact packages.

Replacement Considerations

Check for direct equivalents within the LM4040 series such as LM4040C20IM3-2.5/NOPB for different voltages or packages. Verify pinout compatibility when substituting with other shunt references. Ensure thermal performance and noise specifications meet original design requirements.