BU4318FVE-TR

Overview

The BU4318FVE-TR is a CMOS low voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply integrity. It features an adjustable reset delay timer and operates within a detection voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is 1.8 V with a precision of ±1%. The device utilizes a VSOF-5 package and supports a maximum operating temperature of 125 °C. Supply current is specified at 0.55 μA in the off state when Vdet equals 4.8 V. The output type is CMOS, and it lacks manual reset or watchdog timer functionalities.

Feature Summary

• Adjustable reset delay timer functionality allows customization of response timing relative to voltage thresholds.
• CMOS output structure provides compatibility with standard digital logic interfaces without requiring external pull-up components.
• Wide reset active voltage range supports operation across various low-voltage system architectures.

Applications

• Portable electronic devices requiring precise power supply monitoring
• Battery-operated systems needing low quiescent current supervision
• Embedded controllers utilizing adjustable delay for stable boot sequences

Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm package integrity upon receipt, as VSOF-5 packages are sensitive to mechanical stress during handling. Ensure storage conditions comply with moisture sensitivity levels to prevent soldering defects during assembly processes.

Selection Notes

Select this component when a fixed threshold voltage near 1.8 V is required alongside customizable delay characteristics. Consider the VSOF-5 footprint constraints against available board space. Evaluate the CMOS output drive capability against downstream load requirements to ensure signal integrity without additional buffering stages.

Part Context

This device belongs to the BU43xx series of voltage detectors from ROHM Semiconductor, which focuses on low-power supervisory circuits. The FVE suffix indicates the specific VSOF-5 packaging variant. It serves as a specialized solution for applications demanding compact form factors and precise voltage monitoring capabilities in portable electronics.

Replacement Considerations

The BD5218G-1 is identified as a similar level replacement with the same pinout configuration. Verify that the open-drain output of the substitute matches the circuit design requirements compared to the CMOS output of the original part.