BU4239F-TR

Overview

The BU4239F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply levels in electronic circuits. It features an adjustable delay timer and operates within a reset active voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is 3.9 V with a precision of ±1%. The device utilizes an open-drain output type and maintains low circuit current consumption, specified at 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. It supports a maximum supply voltage of 7 V and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Adjustable delay timer functionality allows customization of reset timing relative to voltage thresholds.
• Open-drain output configuration provides flexible interfacing capabilities for various logic families.
• High accuracy detection with ±1% precision ensures reliable monitoring of critical voltage levels.

Applications

• Power supply supervision in portable electronic devices
• Microcontroller system reset generation
• Battery-powered equipment voltage monitoring

Procurement Notes

Verify component authenticity through authorized channels due to End-of-Life status. Confirm RoHS compliance documentation matches the specific batch. Check datasheet revisions for any parameter updates prior to integration. Ensure packaging specifications align with automated assembly requirements.

Selection Notes

Consider the BU4239F-TR for applications requiring precise voltage monitoring with customizable reset delays. Evaluate the open-drain output compatibility with target logic levels. Assess thermal performance within the specified operating temperature range. Compare power consumption metrics against alternative supervisory circuits for efficiency optimization.

Part Context

This component belongs to the BU42 series of voltage detectors from ROHM Semiconductor. It is part of a family offering various detection thresholds and package options. The BU4239F-TR specifically targets cost-sensitive applications needing reliable supervision without complex external components.

Replacement Considerations

The BD5239G-1 is identified as a recommended replacement with the same pinout. Verify package differences between SOP4 and SSOP5 during physical integration. Confirm electrical parameter compatibility before substituting in existing designs.