BU4209F-TR

Overview

The BU4209F-TR is a single-channel voltage detector manufactured by ROHM Semiconductor, designed for board-mount applications. It features an open-drain output and provides a low-active reset signal with an adjustable delay timer. The device operates within a supply voltage range of 0.7V to 7V and detects under-voltage conditions at a typical threshold of 0.9V. It is housed in a compact 4-pin SOP package (SC-82) and supports a wide operating temperature range from -40°C to 125°C.

Feature Summary

• Provides simple reset or power-on reset functionality with low-active output state
• Features an externally adjustable delay timer for customized reset timing
• Supports operation across a wide input voltage range up to 7V
• Delivers high precision detection accuracy with minimal standby current consumption

Applications

• Portable electronic devices requiring low-power supervision
• Battery-powered systems needing under-voltage protection
• Embedded microcontroller reset circuits
• General-purpose supervisory applications in consumer electronics

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS3 compliance and check for whisker information if applicable. Ensure the specific tape-and-reel packaging matches production requirements. Validate that the 4-SOP footprint aligns with existing PCB layouts before finalizing procurement decisions.

Selection Notes

Select this component when a low-cost, single-channel supervisor with adjustable timing is required. Consider the 0.9V threshold suitability for low-voltage logic interfaces. Evaluate the open-drain output capability against system pull-up requirements. Verify thermal performance within the specified -40°C to 125°C range for the intended environment.

Part Context

This part belongs to the BU4209 series of voltage detectors from ROHM. It shares pinout compatibility with similar models like the BD5209G-1, facilitating potential design updates. The device represents a standard solution for basic power monitoring tasks where precise multi-channel supervision is unnecessary.

Replacement Considerations

The BD5209G-1TR is documented as a similar level replacement with the same pinout configuration. Verify functional equivalence regarding threshold voltage and delay adjustability before substitution.