BU4309F-TR

Overview

The BU4309F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single power supply lines. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 0.9 V with a precision of ±1%. The device delivers a low-level active reset output and consumes minimal current, specified at 0.40 μA in the ON state and 0.55 μA in the OFF state when VDET equals 4.8 V. It utilizes a VSOF-5 package and supports operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• CMOS voltage detection with adjustable reset delay timer functionality
• Low power consumption suitable for battery-operated applications
• High accuracy voltage detection with hysteresis control

Applications

• Portable electronic devices requiring low standby current
• Microprocessor system reset circuits
• Battery-powered equipment monitoring

Procurement Notes

Verify component authenticity through authorized channels as this part number may be subject to end-of-life status or limited availability. Confirm that the VSOF-5 package dimensions and pinout match the design requirements. Ensure compliance with RoHS directives and check for any specific handling instructions related to the CMOS technology used in the manufacturing process.

Selection Notes

Select this component when a precise 0.9 V detection threshold is required alongside adjustable timing delays. Consider the low operating current for energy-sensitive designs. Verify that the 7 V maximum supply voltage accommodates the system's peak input levels. Evaluate the thermal performance within the specified -40°C to +125°C range against the application environment.

Part Context

This component belongs to the BU42(43)xxFVE series of supervisory circuits from ROHM Semiconductor. It is part of a family of low-voltage detectors designed for compact surface-mount applications. The series emphasizes high accuracy and low power consumption, catering to modern portable electronics where space and energy efficiency are critical constraints.

Replacement Considerations

The BD5209G-1 is listed as a recommended replacement with the same pinout. Verify compatibility regarding the SSOP5 package versus the original VSOF-5 form factor and confirm that the open-drain output type aligns with the circuit design requirements.