BU4228F-TR

Overview

The BU4228F-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervising power supply voltages in electronic circuits. It features an adjustable reset delay timer and provides a low-active open-drain output. The device operates within a supply voltage range of 0.7 V to 7 V and maintains a typical detection threshold of 2.8 V with ±1% precision. It supports surface-mount installation in a compact 4-SOP (SC-82) package and functions reliably across an industrial temperature range from -40°C to +125°C.

Feature Summary

• Provides simple reset or power-on reset functionality with an adjustable delay timer to prevent false triggering during power transitions.
• Features an open-drain or open-collector output interface compatible with various logic families, ensuring flexible system integration.
• Operates with low power consumption suitable for battery-powered applications while maintaining high accuracy in voltage monitoring.

Applications

• Microprocessor and microcontroller system reset supervision
• Portable equipment power management
• Industrial control circuit monitoring

Procurement Notes

Verify component authenticity through authorized distributors as the part is obsolete. Confirm package integrity and check for RoHS compliance documentation. Ensure replacement strategies account for the discontinuation status and validate pinout compatibility if substituting with similar level parts like BD5228G-1.

Selection Notes

Select this component when a fixed threshold voltage detector with adjustable delay is required for non-critical systems. Consider the 4-SOP package constraints and verify that the open-drain output meets the pull-up requirements of the target logic interface. Evaluate thermal performance within the specified operating temperature range for the intended application environment.

Part Context

This component belongs to the BU42xx series of voltage detectors from Rohm Semiconductor, which are designed for general-purpose power supply monitoring. The series offers various threshold voltages and packages to support diverse embedded system requirements. The BU4228F variant specifically targets cost-sensitive applications needing reliable voltage supervision without complex configuration.

Replacement Considerations

BD5228G-1TR is listed as a recommended replacement with similar specifications but requires verification of package differences between SOP4 and SSOP5.