BU4940FVE-TR

Supervisors Overview

The BU4940FVE-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring supply voltages in electronic circuits. It features a typical under-voltage detection threshold of 4.0V with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and utilizes a CMOS output type. It does not include a reset delay timer or manual reset functionality. The circuit current is specified at 0.40μA (ON) and 0.55μA (OFF) at Vs=4.8V. Hysteresis is set at Vdet x 0.05. It supports an L output current of 0.4mA at low voltage and 2mA at high voltage. Operating temperatures range from -40°C to 125°C. The component is housed in a VSOF5 package.

Supervisors Feature Summary

• CMOS output configuration for digital interface compatibility
• Low power consumption with microampere-level operating currents
• Integrated hysteresis to prevent output oscillation during voltage transitions

Supervisors Applications

• General purpose voltage supervision in embedded systems
• Monitoring power rails in consumer electronics
• Backup power switching control applications

Supervisors Procurement Notes

Verify the obsolete status and last-time-buy availability through official ROHM channels before procurement planning. Confirm that the VSOF5 package dimensions match the target PCB footprint. Ensure the 4.0V detection threshold aligns with system requirements. Check RoHS compliance documentation for environmental regulations. Validate that the lack of watchdog or delay timers meets design specifications.

Supervisors Selection Notes

Select this component when a fixed 4.0V threshold is required for voltage monitoring. Consider the VSOF5 package size constraints for layout optimization. Evaluate the CMOS output drive capability against load requirements. Verify that the absence of adjustable delay or manual reset functions fits the application logic. Compare power consumption metrics against other supervisory ICs for efficiency targets.

Supervisors Part Context

The BU4940FVE-TR belongs to the BU49xx series of standard voltage detectors from ROHM Semiconductor. This series provides precise under-voltage detection with low power consumption. The part is typically used in applications requiring reliable power management without complex supervisory features. It complements other ROHM PMIC solutions for complete system power integrity.

Supervisors Replacement Considerations

The BD5240G-1 is listed as a similar specification replacement. Verify package differences between VSOF5 and SSOP5. Check if open-drain output requires pull-up resistor adjustments compared to CMOS push-pull. Confirm threshold voltage and current consumption similarities.