BU4845F-TR

Supervisors Overview

The BU4845F-TR is a standard CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages in electronic systems. It features an open-drain output and operates within a reset active voltage range of 0.7 V to 7 V. The device detects under-voltage conditions with a typical threshold of 4.5 V and maintains high accuracy with a detection precision of ±1%. It consumes ultra-low current, specified as 0.40 µA when active and 0.55 µA when inactive at the maximum detection voltage. The component supports a wide operating temperature range from -40°C to +125°C and is housed in a compact SOP-4 package.

Supervisors Feature Summary

• Ultra-low current consumption for extended battery life in portable applications
• High-accuracy voltage detection with ±1% precision across the operating range
• Compact SOP-4 surface-mount package suitable for space-constrained designs

Supervisors Applications

• Microcontroller system supervision
• Logic circuit power monitoring
• Battery-powered device voltage tracking

Supervisors Procurement Notes

Verify end-of-life status before procurement as this part may be discontinued or subject to last-time-buy restrictions. Confirm RoHS compliance and specific packaging requirements such as tape-and-reel quantities. Ensure the selected replacement matches the SOP-4 footprint and electrical characteristics if availability is limited.

Supervisors Selection Notes

Select this component for applications requiring precise voltage monitoring with minimal power draw. The open-drain output allows flexible interfacing with various logic families. Consider the 4.5 V threshold suitability for the target system's nominal voltage level. Verify that the SOP-4 package dimensions align with the PCB layout constraints.

Supervisors Part Context

This component belongs to the BU48xx series of standard CMOS voltage detectors. The series offers multiple detection voltages in 0.1 V increments and includes variants with different output types like CMOS outputs. The BU4845F-TR specifically provides an open-drain configuration, distinguishing it from CMOS-output counterparts within the same family.

Supervisors Replacement Considerations

BD5245G-1 is a recommended replacement with similar specifications but utilizes an SSOP-5 package instead of SOP-4.