BU4209FVE-TR

Overview

The BU4209FVE-TR is a CMOS voltage detector manufactured by Rohm Semiconductor, designed for monitoring single power supply lines. It features an adjustable reset delay timer and operates within a wide supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 0.9 V with a precision of ±1%. The device utilizes a VSOF-5 surface-mount package and supports low active reset states without manual reset or watchdog functions.

Feature Summary

• Integrates an adjustable external resistor-based reset delay timer for customized timing control
• Provides high-precision voltage detection with ±1% accuracy tolerance
• Supports operation across an extended industrial temperature range

Applications

• Portable electronic devices requiring low-power supervision
• Battery-operated systems needing reliable undervoltage protection
• Embedded circuits utilizing adjustable reset timing sequences

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm package integrity and pinout compatibility during integration. Check RoHS compliance documentation for regulatory adherence. Validate electrical parameters against current design requirements before finalizing procurement decisions.

Selection Notes

Evaluate the fixed 0.9 V detection threshold against system voltage rails. Consider the VSOF-5 footprint constraints for PCB layout. Assess the need for adjustable delay functionality versus simpler fixed-timer alternatives. Ensure the open-drain output interface matches the downstream logic level requirements.

Part Context

This component belongs to the BU42xx series of supervisory circuits from Rohm Semiconductor. It serves as a specialized power management IC focused on voltage monitoring rather than general-purpose regulation. The family includes variants with different detection thresholds and packaging options.

Replacement Considerations

The BD5209G-1TR is identified as a similar-level replacement with identical pinout configuration. Verify functional equivalence regarding detection thresholds and output characteristics before substitution.