BU4945F-TR

Supervisors Overview

The BU4945F-TR is a standard CMOS voltage detector IC manufactured by ROHM Semiconductor. It features a typical under-voltage detection threshold of 4.5V with a precision of ±1%. The reset active voltage range spans from 0.7V to 7V, utilizing a CMOS open drain output type. The device operates without a manual reset or watchdog timer function. Circuit current consumption is specified at 0.40μA when on and 0.55μA when off, measured at Vdet=4.8V. Hysteresis is set at Vdet x 0.05. It supports an operating temperature range from -40°C to +125°C and is housed in an SSOP-5 package.

Supervisors Feature Summary

• CMOS open drain output configuration for flexible logic interfacing
• High accuracy voltage detection with ±1% precision tolerance
• Ultra-low power consumption suitable for battery-operated systems
• Wide operating voltage range covering 0.7V to 7V

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable under-voltage monitoring
• General-purpose supervisory circuits in consumer electronics
• Embedded systems requiring stable reset signals during power transitions

Supervisors Procurement Notes

Verify the specific ordering suffix and tape quantity against official ROHM documentation before procurement. Confirm that the SSOP-5 package dimensions match your PCB footprint requirements. Ensure the supply status aligns with production timelines, as this component may be subject to end-of-life notices. Cross-reference the RoHS compliance status with current regulatory standards for your target market. Validate the operating temperature range suitability for your specific environmental conditions.

Supervisors Selection Notes

Select the BU4945F-TR when a fixed 4.5V threshold is required for system supervision. Consider its low current consumption for applications prioritizing energy efficiency over long battery life. The open drain output allows for wired-OR configurations or level shifting if necessary. Evaluate the ±1% precision against your system's noise margins. Compare the SSOP-5 package size against available board space constraints relative to alternative packages like SOP-4.

Supervisors Part Context

This component belongs to ROHM's standard voltage detector series, designed for power supply support functions. It complements other models in the family offering different detection thresholds or additional features like watchdog timers. The BU4945F-TR specifically addresses applications needing a precise 4.5V reference point. Its design focuses on minimizing power usage while maintaining high accuracy in detecting under-voltage conditions.

Supervisors Replacement Considerations

The BD5245G-1 is listed as a similar specification replacement part. Verify compatibility regarding the 4.5V threshold, output type, and package differences between SSOP-5 and SOIC-5. Check if the hysteresis characteristics and current consumption meet original design requirements.