BU4821G-TR

Supervisors Overview

The BU4821G-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring supply voltages in electronic circuits. It features an open-drain output and operates within a reset active voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is 2.1 V with a precision of ±1%. Hysteresis is set at VDET x 0.05. The device consumes 0.40 μA when active and 0.55 μA when off, measured at VDET=4.8V. It supports a temperature range from -40°C to +125°C and is housed in an SSOP-5 package.

Supervisors Feature Summary

• Provides precise under-voltage detection with a fixed threshold of 2.1 V and ±1% accuracy.
• Features low power consumption suitable for battery-operated applications.
• Includes built-in hysteresis to prevent output oscillation during voltage transitions.

Supervisors Applications

• Monitoring power supply voltages in portable electronic devices
• Providing reset signals for microcontrollers and digital logic circuits
• Battery management systems requiring low quiescent current

Supervisors Procurement Notes

Verify the specific suffix G-TR to confirm the SSOP-5 package and tape-and-reel packaging format. Confirm RoHS compliance status as indicated in the official documentation. Check the current supply status, as this component may be designated as not recommended for new designs. Ensure the ordering part number matches the required quantity per reel.

Supervisors Selection Notes

Select this component when a fixed 2.1 V detection threshold is required without manual reset or watchdog functionality. Consider the SSOP-5 package constraints for PCB layout. Evaluate the open-drain output capability against the system's pull-up requirements. Compare power consumption figures with alternative detectors if ultra-low standby current is critical for the application design.

Supervisors Part Context

This part belongs to the BU48xx series of standard voltage detectors from ROHM. These components are CMOS-based supervisory circuits intended for general-purpose voltage monitoring. The series offers various detection thresholds to accommodate different logic families and power rails. The BU4821G specifically targets applications needing reliable reset generation at the 2.1 V level.

Supervisors Replacement Considerations

The BD5221G-1 is listed as a similar specification replacement with a recommended status. Verify package compatibility and exact threshold precision differences before substitution.