BU4947G-TR

Supervisors Overview

The BU4947G-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It features a typical under-voltage detection threshold of 4.7 V with a precision of ±1%. The device operates within an active voltage range of 0.7 to 7 V and utilizes a CMOS output type. Key electrical characteristics include a circuit current of 0.40 μA in the on state and 0.55 μA in the off state at Vdet=4.8V. It offers a hysteresis voltage defined as Vdet x 0.05. The component is housed in an SSOP-5 package and supports an operating temperature range from -40°C to +125°C.

Supervisors Feature Summary

• Provides precise under-voltage detection with a fixed threshold of 4.7 V and ±1% accuracy.
• Features low power consumption with microampere-level circuit currents in both active states.
• Includes built-in hysteresis to prevent output oscillation during voltage transitions.
• Operates reliably across a wide industrial temperature range up to 125°C.

Supervisors Applications

• Monitoring battery voltage levels in portable electronic devices
• Supervising power rails in embedded systems requiring stable reset signals
• Protecting microcontroller circuits from undervoltage conditions

Supervisors Procurement Notes

Verify that the BU4947G-TR is suitable for your design, as it is marked as Not Recommended for New Designs (NRND). Confirm availability through authorized distributors, noting that supply status may be limited. Ensure the SSOP-5 package dimensions match your PCB footprint requirements. Check for RoHS compliance documentation if required by your manufacturing standards. Consider the BD5247G-1 as a potential alternative if new design support is necessary.

Supervisors Selection Notes

Select this component when a fixed 4.7 V detection threshold is required for single-supply monitoring. The CMOS output interface is compatible with standard digital logic families. The low static current makes it suitable for battery-powered applications where energy efficiency is critical. Verify that the 0.7 V to 7 V operating range covers your system's minimum and maximum supply voltages. The absence of manual reset or watchdog functions simplifies the design if these features are handled externally.

Supervisors Part Context

The BU4947G-TR belongs to the BU49xxG series of standard voltage detectors from ROHM Semiconductor. This series is characterized by high precision and low power consumption. The TR suffix indicates tape and reel packaging for automated assembly. The device is part of ROHM's portfolio of supervisory circuits designed for reliable power management in compact electronic systems.

Supervisors Replacement Considerations

The BD5247G-1 is listed as a similar level replacement with the same package and data sheet specifications. Verify pin compatibility and electrical parameters before substitution. Note that the BD5247G-1 is recommended for new designs, whereas the BU4947G-TR is not.