LM4040DIM3-2.1

Overview

The LM4040DIM3-2.1 is a fully integrated, ultra-low drift, single-chip, buried Zener precision voltage reference solution manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 2.048 V with an initial accuracy tolerance of ±1%. The device features a maximum temperature coefficient of 3 ppm/°C and supports a shunt current range from 60 µA to 15 mA. It operates within a temperature range of -40°C to +85°C and is housed in a SOT-23-3 surface-mount package.

Feature Summary

• Ultra-low drift performance utilizing buried Zener technology for high stability
• Fixed 2.048 V output with ±1% initial accuracy tolerance
• Low dynamic impedance ensures stable reverse breakdown voltage accuracy across wide current ranges

Applications

• Precision analog-to-digital converter (ADC) references
• Digital-to-analog converter (DAC) voltage sources
• Battery-powered instrumentation requiring low power consumption

Procurement Notes

Verify the manufacturer designation carefully, as the LM4040 series has been transitioned between Texas Instruments and Maxim Integrated/Analog Devices. Confirm the specific suffix 'DIM3' corresponds to the desired temperature grade and packaging format. Check current availability status as some variants may be marked as Not Recommended for New Designs (NRND) or discontinued depending on the source distributor.

Selection Notes

Select this component when ultra-low drift is critical, as indicated by the 3 ppm/°C temperature coefficient. Ensure the application requires a 2.048 V fixed reference rather than other available voltages like 2.5 V or 4.096 V. Verify that the SOT-23-3 package fits the PCB layout constraints and that the operating temperature range of -40°C to +85°C meets environmental requirements.

Part Context

This part belongs to the LM4040 family of micropower shunt voltage references. The 'DI' suffix typically denotes the industrial temperature range (-40°C to +85°C) and specific accuracy class. The series is designed to replace older discrete Zener diode solutions, offering improved precision and lower noise in a compact surface-mount form factor suitable for modern electronic designs.

Replacement Considerations

LM4040DIM3-2.1+T is a compatible variant from Maxim Integrated/Analog Devices with identical electrical specifications. For general replacements, verify if LM4040BIM3-2.1 is suitable if higher accuracy (±0.2%) is acceptable, though it may have different thermal characteristics.