BU4839G-TR

Supervisors Overview

The BU4839G-TR is a CMOS voltage detector from ROHM Semiconductor, designed for supervisory circuit applications. It features an N-channel open-drain output and monitors a single input with a detection threshold of 3.9 V. The device operates within a supply voltage range of 0.7 V to 7 V and maintains high accuracy with a tolerance of ±1%. It consumes ultra-low current, typically 550 nA, and functions reliably across an extended temperature range from -40°C to +125°C. Packaged in a compact SSOP-5 format, it lacks manual reset, watchdog timer, or battery backup switching capabilities.

Supervisors Feature Summary

• Ultra-low current consumption for power-sensitive designs
• High-accuracy voltage detection with ±1% precision
• Wide operating temperature range suitable for industrial environments
• Compact SSOP-5 package for space-constrained PCB layouts

Supervisors Applications

• Portable electronic devices requiring low power monitoring
• Industrial control systems operating in extreme temperatures
• Battery-powered equipment needing reliable voltage supervision
• Embedded systems utilizing CMOS logic interfaces

Supervisors Procurement Notes

Verify component authenticity through authorized channels due to the Not Recommended for New Designs (NRND) status. Confirm that the SSOP-5 package dimensions match your PCB footprint requirements. Ensure design compatibility with the open-drain output configuration, which requires external pull-up resistors. Review the latest datasheet for any updates regarding thermal performance or electrical characteristics before finalizing procurement plans.

Supervisors Selection Notes

Select this component when a fixed 3.9 V threshold is required for system supervision. Consider the open-drain output type if interfacing with varying logic levels via pull-up networks. Evaluate the ±1% accuracy against application tolerances. Compare the 550 nA typical current draw against other detectors if minimizing standby power is critical. 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, characterized by high accuracy and low current consumption. The series offers various detection voltages in 0.1 V increments. The BU4839G-TR specifically provides the 3.9 V threshold option within the N-channel open-drain output variant, distinguishing it from CMOS output versions like the BU49xx series.

Supervisors Replacement Considerations

The BD5239G-1TR is a confirmed substitute with the same SSOP-5 package and 3.9 V detection voltage. Note differences in reset delay timing, as the replacement offers adjustable delay while the original does not. Verify output current capabilities and operating temperature ranges to ensure full functional compatibility.