BU4933F-TR

Supervisors Overview

The BU4933F-TR is a standard CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages. It features a typical under-voltage detection threshold of 3.3V with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and utilizes a CMOS output type. Key electrical characteristics include a circuit current of 0.40μA (ON) and 0.55μA (OFF) at VDET=4.8V, with a hysteresis voltage defined as VDET x 0.05. It supports an operating temperature range from -40°C to +125°C and is housed in a SOP-4 package.

Supervisors Feature Summary

• CMOS output configuration for direct logic interface compatibility
• High accuracy voltage detection with specified hysteresis to prevent output oscillation
• Ultra-low current consumption suitable for battery-powered applications
• Wide operating temperature range for industrial and commercial environments

Supervisors Applications

• Portable electronic devices requiring low standby current
• Microprocessor system reset circuits
• Battery-operated equipment power management
• General-purpose voltage supervision in consumer electronics

Supervisors Procurement Notes

Verify the specific suffix and tape/reel specifications against the manufacturer's latest documentation before ordering. Confirm that the SOP-4 package dimensions match your PCB footprint requirements. Check for any end-of-life or last-time-buy notices associated with this part number to ensure long-term supply availability for production runs.

Supervisors Selection Notes

Select this component when a fixed 3.3V detection threshold with CMOS output is required. Ensure the application does not need manual reset or watchdog timer functions, as these are absent. Compare the ±1% precision and 0.40μA ON current against alternative detectors if tighter tolerances or lower power consumption are critical for the design.

Supervisors Part Context

This part belongs to the BU49xx series of standard CMOS voltage detectors. It serves as a basic supervisory circuit without advanced features like adjustable delays or manual resets. The BU4933F-TR variant specifically denotes the tape-and-reel packaging format for automated assembly processes.

Supervisors Replacement Considerations

The BD5233G-1 is listed as a similar specification replacement. Note that it uses an SSOP-5 package and open-drain output, requiring pinout and circuit adaptation.