BU4821F-TR

Supervisors Overview

The BU4821F-TR is a standard voltage detector manufactured by Rohm Semiconductor, featuring an open-drain output and low-active reset state. It operates within a supply voltage range of 0.7V to 7V with a typical under-voltage detection threshold of 2.1V and ±1% precision. The device consumes 0.40μA in the active state and 0.55μA when inactive (at Vdet=4.8V), with hysteresis set at 5% of Vdet. Packaged in SSOP-5, it supports temperatures from -40°C to 125°C. This component is designated as End-of-Life.

Supervisors Feature Summary

• Provides reliable system reset via open-drain output when input voltage drops below the 2.1V threshold.
• Maintains ultra-low power consumption suitable for battery-operated applications.
• Includes built-in hysteresis to prevent output oscillation during voltage transitions.

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment monitoring
• General-purpose microcontroller supervision

Supervisors Procurement Notes

Verify end-of-life status before procurement. Confirm package type and RoHS compliance. Check replacement availability due to discontinuation. Ensure design-in compatibility with existing circuitry.

Supervisors Selection Notes

Select based on 2.1V threshold requirement and low current needs. Verify operating temperature range matches application environment. Consider alternative models if new designs are required.

Supervisors Part Context

Part of the BU48xx series voltage detectors. Designed for simple reset generation without manual reset or watchdog features. Commonly used in consumer electronics and industrial control systems where basic power supervision is sufficient.

Supervisors Replacement Considerations

BD5221G-1 is listed as a similar specification replacement with identical package and electrical characteristics.