BU4322F-TR

Overview

The BU4322F-TR is a voltage detector with an adjustable delay time, currently in the last time buy phase. It features a typical under-voltage detection voltage of 2.2V with ±1% precision. The reset active voltage range spans from 0.7V to 7V, utilizing a CMOS output type. Key electrical parameters include a circuit current of 0.40μA (ON) and 0.55μA (OFF) at VDET=4.8V. It operates within a temperature range of -40°C to 125°C and is housed in an SOP4 package.

Feature Summary

• Adjustable reset delay timer functionality
• CMOS output type for digital interface compatibility
• Low power consumption with microampere-level operating currents
• Wide reset active voltage range supporting various supply levels

Applications

• Portable equipment requiring low standby current
• Battery-powered systems needing reliable under-voltage monitoring
• General-purpose electronic circuits requiring power supply supervision

Procurement Notes

Verify the Last Time Buy status before finalizing procurement plans, as production may cease. Confirm that the SOP4 package and CMOS output specifications align with existing board designs. Ensure compliance with RoHS directives if required by your manufacturing standards. Cross-reference the specific ordering suffix to guarantee correct packaging and reel quantities.

Selection Notes

Select this component when an adjustable delay timer is necessary alongside precise under-voltage detection. The CMOS output offers stronger drive capability compared to open-drain alternatives. Consider the wide operating voltage range and temperature stability for robust performance in diverse environmental conditions. Evaluate the low quiescent current benefits for battery-operated applications.

Part Context

This part belongs to the BU43xxF series of voltage detectors manufactured by ROHM Semiconductor. It serves as a supervisory circuit for monitoring power supply voltages. The device is designed to provide stable reset signals to microprocessors and memory devices, ensuring system reliability during power fluctuations or brown-out events.

Replacement Considerations

BD5222G-1 is listed as a recommended replacement with the same pinout. Verify package differences (SSOP5 vs SOP4) and output type changes (Open Drain vs CMOS) during integration.