BU4331F-TR

Overview

The BU4331F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed under-voltage detection threshold of 3.1 V with a precision of ±1%. The device supports an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. It utilizes a SOP-4 surface-mount package and offers a low operating current of 550 nA. The component functions without manual reset or watchdog timer capabilities and is rated for an extended temperature range from -40°C to +125°C.

Feature Summary

• CMOS technology ensures low power consumption suitable for battery-operated systems
• Adjustable reset delay timer allows customization of response timing
• High accuracy voltage detection with ±1% precision threshold
• Wide operating supply voltage range supporting various logic levels

Applications

• Portable electronic devices requiring low standby current
• Microprocessor system reset circuits
• Battery-powered equipment monitoring
• Industrial control systems operating in wide temperature environments

Procurement Notes

Verify the specific suffix F-TR against the official datasheet to confirm package type and tape-and-reel specifications. Confirm end-of-life status as the component is listed as discontinued or last-time buy in some channels. Ensure compatibility with existing PCB footprints for SOP-4 packages during replacement planning.

Selection Notes

Select this component when a fixed 3.1 V threshold with high precision is required. The adjustable delay feature distinguishes it from fixed-delay detectors. Consider the SOP-4 package size constraints and the CMOS output drive capability. Verify that the absence of a watchdog timer meets the system safety requirements.

Part Context

This part belongs to the BU42(43)xxF series of supervisory circuits from ROHM Semiconductor. It is part of a family of voltage detectors offering various threshold voltages and package options. The series is characterized by CMOS construction for low current consumption and high accuracy.

Replacement Considerations

The BD5231G-1 is listed as a similar level replacement with the same pinout. Verify electrical parameter compatibility, particularly the threshold voltage and reset delay characteristics, before substitution.