BU4320FVE-TR

Overview

The BU4320FVE-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for low-voltage detection with an adjustable output delay time. It features a typical under-voltage detection threshold of 2.0V and offers high accuracy with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and supports a maximum supply voltage of 7V. It provides a CMOS output type with a low-active reset state. The circuit current consumption is specified at 0.40μA (ON) and 0.55μA (OFF) when VDET=4.8V. Hysteresis voltage is set at VDET x 0.05. The component is housed in a VSOF5 package with dimensions of 1.6x1.6mm (t=0.6mm) and functions reliably across a temperature range of -40°C to 125°C.

Feature Summary

• CMOS voltage detector with adjustable output delay time for precise timing control
• High-accuracy detection with ±1% precision and built-in hysteresis
• Low current consumption suitable for battery-powered applications
• Wide operating voltage range up to 7V with low-active reset output

Applications

• Processor supervisor circuits requiring stable power monitoring
• Battery-operated devices needing low-voltage detection
• Embedded systems with adjustable reset delay requirements
• Portable electronics utilizing CMOS-compatible logic interfaces

Procurement Notes

Verify the exact ordering part number BU4320FVE-TR against official ROHM documentation to ensure correct package and suffix alignment. Confirm RoHS compliance status and lead times through authorized distributors. Check for end-of-life or last-time-buy notices as some variants may have limited availability. Ensure compatibility with your PCB footprint for the VSOF5 package before procurement.

Selection Notes

Select this component when a fixed 2.0V detection threshold with adjustable delay is required. Compare circuit current specifications against other series members if lower power is critical. Verify that the CMOS output type matches your system's input requirements rather than open-drain alternatives. Ensure the VSOF5 package fits your design constraints compared to SOP or SSOP options.

Part Context

The BU4320FVE-TR belongs to the BU43xx series of CMOS voltage detectors characterized by adjustable delay times. This series allows selection based on application needs with detection voltages ranging from 0.9V to 4.8V in 0.1V increments. The BU4320 specifically targets the 2.0V threshold point. It is part of ROHM's portfolio of high-accuracy, low-current supervisory circuits designed for modern electronic systems.

Replacement Considerations

The BD5220G-1 is listed as a recommended replacement with the same pinout and similar electrical characteristics including a 2.0V detection voltage. Note differences in output type (Open Drain vs CMOS) and package (SSOP5 vs VSOF5). Verify thermal performance and current consumption specs match your design requirements before substitution.