LM4040DECT-4.1

Overview

The LM4040DECT-4.1 is a precision micropower shunt voltage reference manufactured by STMicroelectronics. It provides a fixed output voltage of 4.096 V with an initial accuracy tolerance of ±1%. The device operates within an industrial temperature range of -40 °C to +125 °C and features a maximum temperature coefficient of 70 ppm/°C. It utilizes a SOT-323-5 (SC-70-5) surface-mount package. Key electrical characteristics include a typical low-frequency noise of 10 µVp-p and a cathode current of 12 µA at 25 °C, with a maximum sink current capability of 15 mA.

Feature Summary

• Provides stable fixed output voltage across the full industrial temperature range
• Ultra-low operating current suitable for power-restricted designs
• High precision with minimal low-frequency noise
• Compact surface-mount packaging for space-saving applications

Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Handheld meters and test equipment
• Medical devices with strict power constraints

Procurement Notes

Verify the specific suffix 'D' confirms the ±1% accuracy grade and 'E' indicates the tape-and-reel packaging format. Confirm the 'T' designation aligns with the SOT-323-5 package type. Ensure the '4.1' suffix corresponds to the 4.096 V output voltage. Cross-reference the manufacturer part number with official STMicroelectronics documentation to validate RoHS compliance and environmental status before procurement.

Selection Notes

Select this component when a fixed 4.096 V reference with ±1% tolerance is required in a compact SOT-323-5 package. It is suitable for designs prioritizing low quiescent current and high stability over the industrial temperature range. Consider alternatives if tighter accuracy grades like ±0.1% or ±0.2% are necessary, or if different package footprints are mandated by the PCB layout.

Part Context

The LM4040 series comprises low-power shunt voltage references available in multiple accuracy grades and output voltages. The DECT-4.1 variant specifically targets cost-sensitive applications requiring moderate precision. It belongs to the broader family of micropower references designed for portable electronics and industrial control systems where space and power efficiency are critical design parameters.

Replacement Considerations

Direct substitutes include other LM4040 variants with matching 4.096 V output and similar accuracy, such as LM4040BECT-4.1 for higher precision. Verify pin compatibility and thermal performance when replacing with components from other manufacturers offering equivalent shunt reference specifications.