BU4346F-TR

Overview

The BU4346F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply integrity in electronic circuits. It features an adjustable reset delay timer and operates within a detection voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 4.6 V with a precision of ±1%. The device supports a maximum operating temperature of +125 °C and a minimum of -40 °C. Key electrical specifications include a working supply current of 550 nA and a power dissipation rating of 210 mW. It utilizes a VSOF-5 surface-mount package.

Feature Summary

• CMOS output type provides low power consumption suitable for battery-operated applications.
• Adjustable reset delay timer allows customization of the response time following voltage recovery.
• High accuracy voltage detection ensures reliable system reset during under-voltage conditions.

Applications

• Microprocessor and microcontroller reset circuits
• Portable electronic devices requiring low voltage monitoring
• Industrial control systems needing stable power supervision

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolescence notices, as supply status may vary. Ensure the VSOF-5 package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when a fixed 4.6 V threshold with adjustable delay is required. Compare against BD5246G-1 for similar functionality but different package types. Consider the ±1% precision and low standby current for energy-sensitive designs.

Part Context

This part belongs to the BU42(43)xxFVE series of voltage detectors from ROHM. It is functionally related to variants like BU4346F and BU4346G, differing primarily in packaging and specific manufacturing revisions. The series is characterized by low current consumption and high detection accuracy.

Replacement Considerations

The BD5246G-1 is listed as a recommended replacement with similar specifications. Note that the BD5246G-1 uses an SSOP5 package instead of VSOF-5, requiring PCB layout adjustments for pin compatibility.