LM4040BELT-3.0

Overview

The LM4040BELT-3.0 is a precision shunt voltage reference manufactured by STMicroelectronics, designed for applications requiring high accuracy and low power consumption. It provides a fixed output voltage of 3.0 V with an initial accuracy of ±0.2%. The device operates within an industrial temperature range from -40°C to +125°C and features a maximum temperature coefficient of 70 ppm/°C. Key electrical characteristics include an ultra-low operating current of 10 µA at 25°C and typical low-frequency noise of 10 µVp-p. It is housed in a compact SOT-23-3L surface-mount package.

Feature Summary

• Provides stable fixed output voltage across the industrial temperature range
• Ultra-low operating current suitable for power-constrained designs
• High precision with ±0.2% initial accuracy at 25°C
• Low low-frequency noise performance

Applications

• Portable battery-powered equipment
• Data acquisition systems
• Instrumentation

Procurement Notes

Verify the specific suffix BELT corresponds to the required accuracy grade (±0.2%) and packaging format. Confirm the manufacturer source, as this part number may be sourced from multiple suppliers including Microchip Technology due to industry standardization. Ensure RoHS compliance status matches project requirements before procurement.

Selection Notes

Select this component when a precise 3.0 V reference is needed in space-limited designs. The SOT-23-3L package offers a small footprint ideal for portable devices. Consider the ±0.2% tolerance if tighter specifications are not required, balancing cost and performance against higher precision variants like the A-grade or lower precision C/D grades.

Part Context

This component belongs to the LM4040 family of shunt voltage references. The family includes various output voltages (2.048 V, 2.5 V, 3.0 V, 4.096 V, 5.0 V) and accuracy grades (A: ±0.1%, B: ±0.2%, C: ±0.5%, D: ±1%). The LM4040 series is characterized by its stability with capacitive loads and low power operation, making it a versatile choice for general-purpose analog circuits.

Replacement Considerations

Direct substitutes within the same family include LM4040BET-3.0 or LM4040BIM3-3.0, which share the same ±0.2% accuracy and 3.0 V output but may differ in package type (e.g., SC-70-5 or TO-236-3). Verify pinout compatibility and thermal characteristics when substituting.