BU4322G-TR

Overview

The BU4322G-TR is a CMOS low voltage detection circuit manufactured by ROHM Semiconductor, designed for power supply monitoring applications. It operates within a supply voltage range of 0.7 V to 7 V and features a fixed under-voltage detection threshold of 2.2 V with ±1% accuracy. The device utilizes an SSOP-5 package and includes an adjustable reset delay timer. It draws a typical operating current of 550 nA and supports a wide industrial temperature range from -40 °C to +125 °C.

Feature Summary

• CMOS technology ensures ultra-low current consumption for battery-powered systems
• Adjustable reset delay timer allows flexible timing configuration via external resistor
• Fixed 2.2 V detection threshold provides precise voltage supervision
• Compact SSOP-5 package suitable for space-constrained designs

Applications

• Portable electronic devices requiring low standby current
• Battery-operated equipment needing reliable power-fail detection
• Industrial control systems operating in extended temperature environments
• Embedded microcontroller reset circuits

Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before integration into new products. Confirm availability through authorized distributors as stock levels may be limited. Ensure the ordering part number matches the specific suffix requirements for tape-and-reel packaging. Cross-reference with replacement candidates if long-term supply assurance is required for production runs.

Selection Notes

Select this component when a fixed 2.2 V threshold is required rather than an adjustable one. Compare against the BD5222G series for potential replacements offering improved availability or updated specifications. Evaluate the adjustable delay feature against fixed-delay alternatives if timing precision is critical. Consider the SSOP-5 footprint compatibility during PCB layout planning.

Part Context

This device belongs to the BU42(43)xxG series of supervisory circuits from ROHM Semiconductor. It is positioned as a legacy product within the manufacturer's portfolio, often superseded by newer generations like the BD52xxG series. The series is characterized by CMOS construction and low-power operation suitable for general-purpose voltage monitoring tasks.

Replacement Considerations

The BD5222G-1TR is documented as a recommended replacement with the same pinout and package. Verify electrical parameter compatibility, particularly regarding output drive current and hysteresis characteristics, before substituting.