BU4343F-TR

Overview

The BU4343F-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for supervisory circuit applications. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The device provides a typical under-voltage detection threshold of 4.3 V with a precision of ±1%. It draws a maximum operating current of 550 nA and dissipates up to 400 mW. The component is housed in a SOP-4 package and supports an operating temperature range from -40°C to +125°C.

Feature Summary

• CMOS output type for low power consumption
• Adjustable reset delay timer functionality
• High accuracy voltage detection with ±1% precision

Applications

• Portable equipment power management
• Microprocessor system supervision
• Battery-powered device monitoring

Procurement Notes

Verify the obsolete status of this component before integration into new designs. Confirm availability through authorized distributors as standard stock may be limited. Ensure that the SOP-4 package dimensions align with existing PCB footprints. Check for RoHS compliance documentation if required by project specifications.

Selection Notes

Select this part when a fixed 4.3 V threshold with high precision is required. The adjustable delay feature allows customization for specific startup sequences. Consider the low quiescent current for battery-sensitive applications. Verify that the SOP-4 package fits the mechanical constraints of the target assembly.

Part Context

This component belongs to the BU43xx series of voltage detectors. It shares functional similarities with other parts in the family but differs in threshold voltage and package type. The BU4343F-TR specifically targets applications requiring a 4.3 V detection point in a compact surface-mount format.

Replacement Considerations

The BD5243G-1TR is listed as a recommended replacement with similar pinout and electrical characteristics. Verify compatibility regarding the SOP-4 versus SSOP-5 package differences and ensure the reset delay configuration remains suitable for the application.