BU4321F-TR

Overview

The BU4321F-TR is a CMOS low voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring power supply voltages with high precision. It features an adjustable output delay timer and operates within a reset active voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 2.1 V with a precision of ±1%. The device draws a maximum circuit current of 0.55 μA in the off state and supports an L output current of up to 10 mA. It is housed in a compact SSOP-5 package and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• CMOS technology ensures ultra-low power consumption suitable for battery-operated applications
• Adjustable output delay timer allows flexible timing configuration via external components
• High accuracy voltage detection with ±1% precision for reliable system supervision

Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing precise voltage monitoring
• Embedded systems utilizing microcontroller reset supervision

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolete or not recommended for new design (NRND) status before integration. Ensure packaging specifications match production requirements and validate datasheet revisions against current engineering standards.

Selection Notes

Select this component when a low-profile SSOP-5 package is required alongside adjustable delay functionality. Consider the 2.1 V detection threshold and 0.55 μA quiescent current for energy-sensitive designs. Evaluate the open-drain output capability against load requirements and ensure the operating temperature range meets environmental constraints.

Part Context

This part belongs to the BU43xx series of low voltage detectors from ROHM, which are optimized for portable electronics. The series offers various detection thresholds and package options, maintaining consistent performance characteristics such as low current consumption and high accuracy across different model variants within the family.

Replacement Considerations

The BD5221G-1 is listed as a similar level replacement with the same pinout and comparable electrical specifications. Verify package compatibility and parameter alignment before substitution.