BU4339F-TR

Overview

The BU4339F-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages. It features an adjustable reset delay timer and operates within a detection voltage range of 0.7V to 7V. The device provides high accuracy with a typical under-voltage detection threshold of 3.9V and a precision of ±1%. It consumes ultra-low current, specified at 0.40µA (ON) and 0.55µA (OFF) at VDET=4.8V. The component supports a wide operating temperature range from -40°C to +125°C and is housed in a compact SOP-4 package.

Feature Summary

• Ultra-low current consumption for extended battery life
• High-accuracy voltage detection with adjustable reset delay
• Wide operating temperature range suitable for industrial environments

Applications

• Portable electronic devices requiring low power monitoring
• Battery-powered systems needing reliable voltage supervision
• Industrial control circuits with strict temperature requirements

Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet before procurement. Confirm that the component status aligns with project lifecycle requirements, as availability may be limited. Ensure compatibility with existing PCB footprints and design specifications during the sourcing process.

Selection Notes

Select this component when precise voltage monitoring with minimal power draw is required. The adjustable delay feature allows customization for specific system startup sequences. Consider the SOP-4 package size constraints and the CMOS output type for interface compatibility with downstream logic circuits in the design.

Part Context

This part belongs to the BU42(43)xxF series of standard CMOS voltage detectors. It is designed to replace older generations or provide a cost-effective solution for non-automotive applications. The series emphasizes small package sizes and low standby current, making it suitable for space-constrained designs.

Replacement Considerations

The BD5239G-1 is listed as a recommended alternative with the same pinout. Verify package compatibility and electrical parameter differences, such as output type and current consumption, before substitution.