BU4220F-TR

Overview

The BU4220F-TR is a CMOS voltage detector IC from ROHM Semiconductor featuring an adjustable output delay timer. It operates within a supply voltage range of 0.7 V to 7 V and provides a typical under-voltage detection threshold of 2.0 V with ±1% precision. The device utilizes an open-drain output type and maintains ultra-low current consumption, specified at 0.55 µA (typical) in the OFF state and 0.40 µA in the ON state when VDET is set to 4.8 V. It includes hysteresis voltage defined as VDET multiplied by 0.05 and supports an external delay circuit resistance up to 10.0 MΩ. The component is housed in a compact SOP-4 package measuring 2.0 mm x 2.1 mm with a thickness of 1.05 mm, suitable for industrial temperature ranges from -40°C to +125°C.

Feature Summary

• Adjustable reset delay time capability via external resistor connection
• Ultra-low power consumption design optimized for battery-operated systems
• High accuracy voltage detection with fixed hysteresis characteristics

Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing reliable under-voltage monitoring
• Industrial control systems operating in wide temperature environments

Procurement Notes

Verify component authenticity through authorized distribution channels due to end-of-life status. Confirm RoHS compliance documentation matches specific manufacturing batches. Ensure ordering part number BU4220F-TR aligns with required SOP-4 packaging specifications. Validate technical parameters against latest official datasheets before integration into final designs.

Selection Notes

Select this component for applications requiring precise voltage supervision with customizable timing delays. Consider the open-drain output configuration for compatibility with various logic levels. Evaluate the SOP-4 footprint constraints against available board space. Assess thermal performance requirements within the specified -40°C to +125°C operational range.

Part Context

This voltage detector belongs to the BU42xx series of CMOS supervisory circuits designed for low-voltage monitoring. The series emphasizes high accuracy and minimal power usage, making it suitable for portable electronics. The BU4220F variant specifically targets the 2.0 V detection threshold application within the broader family of adjustable delay detectors.

Replacement Considerations

The BD5220G-1 is documented as a recommended replacement with the same pinout configuration. Verify package differences between SOP-4 and SSOP-5 during physical implementation.