BU4309FVE-TR

Overview

The BU4309FVE-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It features an adjustable reset delay time and operates within a maximum supply voltage of 7 V. The device provides a threshold voltage of 900 mV with an accuracy of 1%, ensuring precise under-voltage detection. It utilizes a VSOF-5 surface-mount package and supports a wide operating temperature range from -40°C to +125°C. The component draws a typical static current of 300 nA and includes no manual reset or watchdog timer functions.

Feature Summary

• CMOS output type for low-power digital interface compatibility
• Adjustable reset delay time functionality
• High precision voltage detection with 1% accuracy
• Wide industrial temperature operation capability

Applications

• Microprocessor system supervision
• Battery-powered equipment monitoring
• Portable electronic device power management
• Embedded system voltage tracking

Procurement Notes

Verify the specific suffix TR for reel packaging requirements against your assembly line specifications. Confirm that the VSOF-5 footprint matches your PCB design constraints. Check the latest manufacturer status as this component may be subject to end-of-life transitions. Ensure compliance with RoHS directives if required for your target market regulations before finalizing procurement orders.

Selection Notes

Select this component when a low quiescent current and high accuracy are critical for battery life extension. The adjustable delay feature allows customization for specific noise immunity requirements during power-up sequences. Consider the VSOF-5 package size for space-constrained designs. Verify that the 7 V maximum input rating aligns with your system's peak voltage levels to prevent device damage.

Part Context

This part belongs to the BU42(43)xxFVE series of supervisory circuits from ROHM Semiconductor. It is specifically engineered for applications requiring reliable voltage monitoring in compact form factors. The series is characterized by its CMOS output structure and low power consumption, making it suitable for modern portable electronics and industrial control systems where efficiency and precision are paramount.

Replacement Considerations

The BD5209G-1 is identified as a recommended replacement with the same pinout configuration. Note that the replacement uses an SSOP5 package instead of VSOF5, requiring PCB layout adjustments. Both devices share similar detection voltages and adjustable delay features, but output types differ between CMOS and open drain.