BU4839F-TR

Supervisors Overview

The BU4839F-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed detection threshold of 3.9 V with ±1% accuracy. The device operates within a supply voltage range up to 7 V and supports an extended temperature range from -40°C to +125°C. It utilizes an open-drain output type without manual reset or watchdog timer functions. The component is housed in a compact SOP-4 package, suitable for surface-mount installation.

Supervisors Feature Summary

• Ultra-low current consumption design for energy efficiency
• High-accuracy voltage detection with fixed threshold
• Wide operating temperature range for industrial environments
• Compact surface-mount packaging

Supervisors Applications

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

Supervisors Procurement Notes

Verify the specific suffix 'F' indicates the SOP-4 package variant when sourcing replacements. Confirm RoHS compliance status as required by project specifications. Check manufacturer lifecycle status, as this part may be subject to discontinuation or last-time buy notices. Ensure compatibility with existing PCB footprint designs utilizing the specified package dimensions.

Supervisors Selection Notes

Select this component when a fixed 3.9 V threshold is required without adjustable settings. Choose the open-drain output configuration if interfacing with logic levels that require external pull-up resistors. Consider the wide temperature range for applications exposed to extreme environmental conditions. Verify that the absence of a watchdog timer meets the system's safety requirements.

Supervisors Part Context

This part belongs to the BU48xx series of standard CMOS reset ICs from ROHM. The series offers various detection voltages in 0.1 V increments. The BU4839F-TR specifically provides a 3.9 V threshold. It shares family characteristics such as low current consumption and high accuracy. Other variants in the series differ primarily in detection voltage and package options.

Supervisors Replacement Considerations

BD5239G-1TR is documented as a similar specification replacement with comparable detection voltage.