LM4040BECT-2.5

Overview

The LM4040BECT-2.5 is a precision micropower shunt voltage reference manufactured by STMicroelectronics, providing a fixed output voltage of 2.5 V with an initial accuracy of ±0.2%. It operates within an industrial temperature range of -40 °C to +125 °C and features a maximum temperature coefficient of 70 ppm/°C. The device is housed in a SOT323-5L surface-mount package and maintains stability when used with capacitive loads.

Feature Summary

• Ultra-low operating current of 10 µA at 25 °C for power-restricted designs
• Very low low-frequency noise typical value of 10 µVp-p
• Stable operation when connected to capacitive loads
• High precision with ±0.2% initial accuracy at 25 °C

Applications

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

Procurement Notes

Verify the specific ordering code against official documentation to ensure correct package type (SOT323-5L), output voltage (2.5 V), and accuracy grade (LM4040B). Confirm environmental compliance status such as ECOPACK grades directly from the manufacturer's datasheet or authorized distributor channels before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring high accuracy and low power consumption in space-constrained environments. The SOT323-5L package is suitable where board area is limited. Ensure the design accounts for the minimum operating current requirements and thermal management within the specified industrial temperature range.

Part Context

This part belongs to the LM4040 series of precision micropower shunt voltage references. The series offers various fixed 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%, and packages include SOT23-3L and SOT323-5L options for different footprint requirements.

Replacement Considerations

Compatible substitutes within the same family include LM4040AECT-2.5 for higher precision (±0.1%) and LM4040CECT-2.5 for lower precision (±0.5%). Other variants like LM4040BELT-2.5 offer the same electrical characteristics but utilize the SOT23-3L package instead of SOT323-5L.

FAQ

Is the LM4040BECT-2.5 stable with capacitive loads?

Yes, the datasheet explicitly states that the device is stable when used with capacitive loads.

What is the maximum temperature coefficient for this device?

The maximum average temperature coefficient is 70 ppm/°C over the operating current range of 10 µA to 15 mA.