BU4324F-TR

Overview

The BU4324F-TR is a voltage detector supervisory circuit manufactured by ROHM Semiconductor. It features a typical under-voltage detection threshold of 2.4 V with ±1% precision. The device operates within a supply voltage range of 0.7 V to 7 V and supports an adjustable reset delay timer. It delivers a CMOS output type and maintains low power consumption, with a static current of 400 nA and operating current of 550 nA at Vdet=4.8V. The component is housed in a SOP-4 package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Provides precise under-voltage monitoring with adjustable reset delay timing capabilities
• Operates with ultra-low static current consumption for battery-powered applications
• Features CMOS output compatible with standard digital logic interfaces

Applications

• Portable electronic devices requiring low-power supervision
• Battery-operated systems needing voltage level monitoring
• Embedded circuits utilizing single-input voltage detection

Procurement Notes

Verify the obsolete status and last-time-buy availability through official ROHM channels before procurement planning. Confirm that the SOP-4 package and specific 2.4V threshold match design requirements. Check RoHS compliance documentation for regulatory adherence. Ensure no manual reset or watchdog features are required, as this part lacks them. Validate lead times for remaining stock if available.

Selection Notes

Select this component when a fixed 2.4V threshold with high accuracy is required. Consider the SOP-4 package size constraints and CMOS output drive capability. Evaluate the need for adjustable delay versus fixed delay alternatives. Compare static current specifications against other low-power supervisors. Ensure the operating voltage range covers the system's minimum and maximum supply levels.

Part Context

This part belongs to the BU42(43)xxF series of voltage detectors from ROHM. It is designed for compact surface-mount applications. The series offers various threshold voltages while maintaining consistent low-power characteristics. The BU4324F-TR specifically targets cost-sensitive and space-constrained designs requiring reliable voltage supervision.

Replacement Considerations

The BD5224G-1 is listed as a similar level replacement with the same pinout. Verify package compatibility between SOP-4 and SSOP-5. Confirm electrical parameter alignment for threshold voltage and output type. Assess manufacturing status changes for both components.