LM4040CECT-3.0

Overview

The LM4040CECT-3.0 is a micropower shunt voltage reference manufactured by STMicroelectronics, providing a fixed 3.0 V output with ±0.5% initial accuracy at 25 °C. It operates within an industrial temperature range of -40 to +125 °C and features a maximum temperature coefficient of 70 ppm/°C. The device requires a minimum operating current of 10 µA and supports a maximum reverse breakdown current of 20 mA. It is housed in a compact SOT323-5L surface-mount package.

Feature Summary

• Ultra-low operating current of 10 µA at 25 °C for power-constrained designs
• High precision with ±0.5% initial accuracy at 25 °C
• Very low low-frequency noise, typically 10 µVp-p
• Stable operation when used with capacitive loads

Applications

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

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to ensure correct package type (SOT323-5L), output voltage (3.0 V), and accuracy grade (LM4040C). Confirm that the NC pin handling aligns with design requirements, as it must be left unconnected or tied to the anode. Cross-reference thermal resistance values for proper heat dissipation planning in the final assembly.

Selection Notes

Select this component for applications requiring a stable 3.0 V reference in space-limited environments due to the small SOT323-5L footprint. The low operating current makes it suitable for battery-powered devices where minimizing quiescent consumption is critical. Ensure the circuit design accommodates the specified minimum operating current of 10 µA to maintain regulation stability across the full industrial temperature range.

Part Context

This part belongs to the LM4040 family of precision micropower shunt voltage references from STMicroelectronics. The family offers various fixed output voltages including 2.048 V, 2.5 V, 3.0 V, 4.096 V, and 5.0 V. Different accuracy grades are available, ranging from 0.1% to 1%, allowing designers to balance cost and performance requirements while maintaining consistent low-noise and low-current characteristics.

Replacement Considerations

Direct substitutes include other LM4040 variants with different accuracies or voltages, such as LM4040BECT-3.0 (±0.2%) or LM4040DECT-3.0 (±1%). For equivalent performance from other manufacturers, consider Maxim Integrated parts like the LM4040CIM3-3.0, ensuring pinout compatibility and electrical specifications match the design constraints.

FAQ

How should the NC pin on the SOT323-5L package be handled?

The NC (No Connect) pin must be left unconnected or connected to the anode terminal.

What is the maximum reverse breakdown current for this device?

The maximum reverse breakdown current (Ik) is 20 mA.