BU4340F-TR

Overview

The BU4340F-TR is a CMOS voltage detector with an adjustable delay timer, designed for monitoring power supply voltages. It features a typical under-voltage detection threshold of 4.0 V with ±1% precision. The reset active voltage range spans from 0.7 V to 7 V, and the output type is CMOS. The circuit current is 0.40 μA when ON (at VDET=4.8 V) and 0.55 μA when OFF. Hysteresis voltage is defined as VDET x 0.05. Output currents are 3.3 mA at low voltage and 6.5 mA at high voltage. The delay circuit resistance is 10.0 MΩ. Operating temperature ranges from -40°C to 125°C. The package is SOP-4.

Feature Summary

• CMOS output structure providing digital reset signals
• Adjustable reset delay time via external resistor
• High accuracy voltage detection with hysteresis
• Low power consumption suitable for battery applications

Applications

• Portable electronic devices requiring low standby current
• Battery-powered systems needing reliable power supervision
• Embedded controllers requiring reset signal generation

Procurement Notes

Verify the obsolete status and last-time-buy designation before procurement. Confirm availability through authorized distributors only. Ensure compatibility with existing SOP-4 footprints. Check RoHS compliance documentation. Validate replacement options such as BD5240G-1 if new designs are required.

Selection Notes

Select this component for applications requiring a 4.0 V detection threshold with adjustable delay. Consider the SOP-4 package constraints and operating temperature range. Evaluate the CMOS output drive capability against load requirements. Compare with recommended replacements like BD5240G-1 for improved pinout or package options in new designs.

Part Context

Part of the BU43xx series voltage detectors from ROHM Semiconductor. Designed for low-voltage monitoring in portable electronics. Offers adjustable delay functionality to prevent false resets during power-up sequences. Replaced by BD5240G-1 for new design implementations.

Replacement Considerations

BD5240G-1 is a recommended replacement with the same pinout but different package (SSOP-5). Verify electrical parameter compatibility and thermal performance differences between SOP-4 and SSOP-5 packages.