BU4347F-TR

Overview

The BU4347F-TR is a voltage detector with an adjustable delay time, manufactured by ROHM Semiconductor. It features a typical under-voltage detection voltage of 4.7 V with ±1% precision. The reset active voltage range spans from 0.7 V to 7 V, utilizing a CMOS output type. The device operates within a temperature range of -40°C to 125°C and consumes 0.40 μA in the ON state and 0.55 μA in the OFF state at VDET=4.8V. It is housed in an SSOP5 package and is supplied in taping format with a unit quantity of 3000.

Feature Summary

• Adjustable reset delay timer functionality
• CMOS output type for digital interface compatibility
• Low power consumption suitable for battery-operated systems

Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable under-voltage monitoring
• General-purpose supervisory circuits in consumer electronics

Procurement Notes

Verify supply status as the component may be designated as 'Last Time Buy' or discontinued for new designs. Confirm RoHS compliance and packaging details (SSOP5, Taping) match project requirements. Ensure ordering part number BU4347F-TR aligns with specific revision needs. Check for recommended replacement parts if long-term availability is critical.

Selection Notes

Select this component when an adjustable delay timer is required alongside precise under-voltage detection. The CMOS output offers direct interfacing with digital logic. Consider the wide operating temperature range (-40°C to 125°C) for industrial or automotive-grade environments where standard commercial grades are insufficient. Verify that the 4.7V threshold matches the system's critical voltage level.

Part Context

The BU4347F belongs to ROHM's BU43xx series of voltage detectors. These components are designed for monitoring power supply voltages in various electronic applications. The BU4347F specifically targets applications requiring a 4.7V detection threshold with adjustable delay capabilities, distinguishing it from fixed-delay or non-adjustable variants in the same family.

Replacement Considerations

BD5247G-1 is listed as a similar level replacement with the same pinout and package. Note that BD5247G-1 uses an open-drain output instead of CMOS and has slightly different electrical characteristics such as circuit current and hysteresis voltage.