BU4228G-TR

Overview

The BU4228G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It operates within a supply voltage range of 0.9 V to 7 V and features an adjustable threshold voltage of 2.8 V with ±1% accuracy. The device utilizes an SSOP-5 surface-mount package and provides an open-drain output. Key functional parameters include an adjustable reset delay timer, low operating current of 550 nA, and a wide operating temperature range from -40°C to +125°C. It lacks manual reset, watchdog, or battery backup functions.

Feature Summary

• Provides precise under-voltage detection with adjustable threshold settings and high accuracy.
• Features an adjustable reset delay timer to manage system startup sequences effectively.
• Delivers an open-drain output compatible with various logic families for flexible interface design.

Applications

• Monitoring microprocessor power supply rails for reliable system initialization
• Supervising battery-powered devices to prevent operation below safe voltage levels
• Protecting memory circuits during power loss events

Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before procurement. Confirm that the SSOP-5 package and 2.8 V threshold match the specific circuit requirements. Ensure compatibility with existing board layouts if replacing older inventory. Check RoHS compliance documentation for regulatory adherence in target markets.

Selection Notes

Select this component when a fixed 2.8 V threshold with high precision is required for single-rail monitoring. The adjustable delay feature makes it suitable for applications needing controlled reset timing. Consider the open-drain output for level shifting needs. Evaluate the low standby current for power-sensitive designs. Verify thermal performance within the specified industrial temperature range.

Part Context

This part belongs to the BU42(43)xxG series of voltage detectors from ROHM Semiconductor. It is specifically engineered for CMOS technology to ensure low power consumption. The series offers various threshold options, with this model focusing on the 2.8 V detection point. It serves as a supervisory circuit within the broader PMIC category, providing essential protection for digital systems.

Replacement Considerations

BD5228G-1TR is a recommended replacement with the same pinout and package. Verify electrical parameter alignment, particularly the threshold voltage and output characteristics, to ensure seamless integration without hardware modifications.