BU4922F-TR

Supervisors Overview

The BU4922F-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It operates within a maximum supply voltage of 7 V and features a typical under-voltage detection threshold of 2.2 V with ±1% precision. The device utilizes a CMOS output type and functions without manual reset or watchdog timer capabilities. It supports an operating temperature range from -40°C to +125°C and consumes low circuit current, specified as 0.40 μA in the ON state and 0.55 μA in the OFF state at VDET=4.8V. The component is housed in a SOP-4 package.

Supervisors Feature Summary

• CMOS output interface for direct logic integration
• High accuracy voltage detection with ±1% precision
• Extended industrial temperature operation capability

Supervisors Applications

• Portable equipment power management
• Battery-powered system supervision
• General-purpose voltage monitoring circuits

Supervisors Procurement Notes

Verify the obsolete status carefully before procurement. The BU4922F-TR is classified as Last Time Buy or End-of-Life. Confirm availability through authorized distributors for final purchase orders only. Ensure that the SOP-4 package and 2.2 V threshold meet specific design requirements, as no new production is anticipated. Validate RoHS compliance documentation for regulatory adherence.

Supervisors Selection Notes

Select this component when a simple, low-power voltage monitor with high precision is required for non-critical systems. The CMOS output allows for straightforward interfacing with digital logic. Consider the limited thermal performance compared to open-drain alternatives if higher drive currents are needed. Verify that the fixed 2.2 V threshold aligns with the target supply rail monitoring needs.

Supervisors Part Context

This part belongs to the BU4922 series of standard voltage detectors from ROHM. It serves as a basic supervisory circuit for maintaining system stability during power fluctuations. The family focuses on cost-effective solutions for consumer electronics where advanced features like watchdog timers are unnecessary.

Supervisors Replacement Considerations

The BD5222G-1 is listed as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package and open-drain output, requiring pinout and circuit adaptation.