BU4340FVE-TR

Overview

The BU4340FVE-TR is a voltage detector with an adjustable delay time, manufactured by ROHM Semiconductor. It features a typical under-voltage detection voltage of 4.0 V with ±1% precision. The reset active voltage range spans from 0.7 V to 7 V, utilizing a CMOS open drain output type. The device includes an adjustable reset delay timer but lacks manual reset and watchdog timer functionalities. It is not designated for automotive applications. Operating current is 0.40 μA when Vdet=4.8V, rising to 0.55 μA in the off state. Hysteresis voltage is specified, and it operates within a temperature range of -40°C to +125°C. The component is housed in a VSOF5 package.

Feature Summary

• Adjustable reset delay timer functionality
• CMOS open drain output configuration
• High precision under-voltage detection at 4.0 V

Applications

• General purpose voltage monitoring
• Microprocessor reset circuits
• Battery powered device supervision

Procurement Notes

Verify the specific ordering suffix TR for tape-and-reel packaging requirements against your manufacturing needs. Confirm RoHS compliance status directly with the manufacturer or authorized distributors as regulatory standards may evolve. Check the supply status carefully, as this component may be subject to end-of-life notices or limited availability. Ensure the VSOF5 package dimensions match your PCB footprint design constraints before finalizing procurement decisions.

Selection Notes

Select this component when a precise 4.0 V threshold with high accuracy is required alongside customizable reset timing. The low operating current makes it suitable for battery-operated systems where power conservation is critical. The adjustable delay feature allows synchronization with system startup sequences. Consider the open-drain output compatibility with your logic levels and pull-up resistor requirements during circuit design.

Part Context

This part belongs to the BU43xx series of voltage detectors from ROHM Semiconductor, designed for supervisory applications. It shares similarities with other parts in the family like the BU4341FVE and BU4342FVE, differing primarily in detection thresholds. The VSOF5 package offers a compact solution for space-constrained designs. The series is known for low power consumption and high reliability in industrial and consumer electronics environments.

Replacement Considerations

The BD5240G-1 is listed as a similar level replacement with the same pinout. Verify electrical parameter compatibility, particularly the detection voltage and output characteristics, before substitution. Ensure the alternative part meets all environmental and packaging requirements of the original design.

FAQ

Is the BU4340FVE-TR suitable for automotive applications?

No, the datasheet explicitly states that this component is not designated for automotive use.

Does the BU4340FVE-TR include a manual reset function?

No, the device does not feature a manual reset input; it relies on automatic voltage detection and delay timing.