BU4318F-TR

Overview

The BU4318F-TR is a voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply voltages. It features an adjustable reset delay timer and operates within a reset active voltage range of 0.7 V to 7 V. The typical under-voltage detection voltage is 1.8 V with a precision of ±1%. The device utilizes a CMOS output type and has no manual reset or watchdog timer functions. Operating circuit current is 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. It is housed in an SOP-4 package and supports a temperature range from -40 °C to +125 °C.

Feature Summary

• Adjustable reset delay timer functionality
• CMOS output configuration
• Wide reset active voltage range

Applications

• Power supply monitoring
• Microprocessor reset circuits
• Battery-powered devices

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging when ordering. Confirm the component status as End-of-Life or Last Time Buy through official ROHM channels before finalizing procurement plans. Ensure compatibility with SOP-4 footprint requirements during integration.

Selection Notes

Select this component for applications requiring a 1.8 V detection threshold with adjustable timing delays. Consider the low operating current for battery-sensitive designs. Verify that the CMOS output drive capability meets downstream logic interface requirements without additional buffering.

Part Context

This part belongs to the BU43xx series of voltage detectors from ROHM. It shares similar electrical characteristics with other variants in the family but differs in package type and specific detection thresholds. The BU4318F-TR specifically denotes the SOP-4 package variant with tape and reel delivery.

Replacement Considerations

BD5218G-1 is listed as a recommended replacement with similar specifications and same pinout.