BU4944G-TR

Supervisors Overview

The BU4944G-TR is a standard voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring power supply voltages in electronic circuits. It features a CMOS 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 4.4 V and maintains a precision of ±1%. It includes hysteresis voltage defined as VDET multiplied by 0.05. The component supports low-level output currents of 3.3 mA and high-level output currents of 6.5 mA. It functions without a manual reset or watchdog timer and operates across a temperature range from -40 °C to 125 °C.

Supervisors Feature Summary

• CMOS output interface for digital logic compatibility
• Integrated hysteresis to prevent output oscillation during voltage transitions
• High noise immunity through specified output current capabilities
• Wide operating voltage range supporting various system power rails

Supervisors Applications

• Microprocessor power supply monitoring
• Portable battery-powered equipment supervision
• Multi-output power supply tracking
• Test and measurement instrument voltage control

Supervisors Procurement Notes

Verify the obsolete status of this component before procurement, as it is marked as Not Recommended for New Designs (NRND). Confirm availability through authorized distributors, noting that production may be limited or discontinued. Ensure the SSOP-5 package matches your PCB footprint requirements. Check for RoHS compliance documentation if required for your manufacturing standards. Consider lead times carefully due to potential end-of-life constraints.

Supervisors Selection Notes

Select this part when a fixed 4.4 V detection threshold is required for single-input voltage monitoring. The CMOS output type suits applications needing direct interfacing with digital logic without additional pull-up resistors. The wide operating temperature range makes it suitable for industrial environments. Evaluate the specific output current requirements against the 3.3 mA low and 6.5 mA high limits to ensure adequate drive capability for the load.

Supervisors Part Context

This component belongs to the BU49xx series of standard voltage detectors from ROHM Semiconductor. It serves as a dedicated supervisory circuit for ensuring stable operation of microprocessors and memory devices. The series typically offers various threshold voltages to accommodate different logic families. This specific model provides a fixed detection point, distinguishing it from adjustable variants in the broader product line.

Supervisors Replacement Considerations

The BD5244G-1 is listed as a recommended replacement with the same SSOP-5 package. Note differences in output type, as the substitute uses an open-drain configuration instead of CMOS. Verify that the adjusted delay timer feature does not conflict with existing circuit timing requirements. Confirm pinout compatibility to ensure seamless integration into existing designs.