BU4329F-TR

Overview

The BU4329F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 2.9 V with a precision of ±1%. The device draws a circuit current of 0.55 μA (OFF state) and 0.40 μA (ON state) at VDET=4.8V. It provides a low-active CMOS output without manual reset or watchdog functionality. The component supports operation from -40°C to +125°C and is housed in an SOP-4 package.

Feature Summary

• CMOS output structure providing low-active reset signal
• Adjustable reset delay time via external resistor
• Low power consumption suitable for battery-operated systems
• Wide operating temperature range for industrial applications

Applications

• Portable electronic devices requiring low standby current
• Microprocessor system power supply supervision
• Battery-powered equipment voltage monitoring
• Industrial control circuits needing reliable reset generation

Procurement Notes

Verify the specific suffix and package type against the official datasheet before procurement. Confirm that the BU4329F-TR meets the required detection voltage and delay characteristics for the target application. Check for any obsolescence notices or last-time-buy status as indicated by manufacturer updates. Ensure compatibility with existing PCB footprints and assembly processes.

Selection Notes

Select this component when a fixed 2.9 V threshold with adjustable delay is required. Compare static current specifications against alternative detectors if ultra-low power is critical. Verify that the SOP-4 package dimensions fit the design constraints. Consider the ±1% accuracy tolerance for precise voltage monitoring requirements.

Part Context

This part belongs to the BU42(43)xxF series of voltage detectors from ROHM. It is distinct from the BU4329G variant which uses an SSOP-5 package. The F-series typically denotes the SOP-4 packaging format. This component serves as a dedicated supervisory circuit for ensuring stable system startup and recovery from brown-out conditions.

Replacement Considerations

The BD5229G-1 is listed as a same-pinout replacement option. Verify pin compatibility and electrical parameter alignment before substitution. Note that the replacement may have different package dimensions or output drive capabilities.