BU4323G-TR

Overview

The BU4323G-TR is a CMOS voltage detector from ROHM Semiconductor, designed for monitoring single-input power supplies. It features an adjustable reset delay time and operates within a supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is 2.3 V with ±1% precision. The device draws a static current of approximately 400 nA (ON) and 550 nA (OFF). It provides a low-active CMOS output without manual reset or watchdog functions. Operating temperatures span from -40°C to +125°C.

Feature Summary

• CMOS output structure with low active state
• Adjustable reset delay timer functionality
• High accuracy voltage detection with hysteresis
• Low power consumption suitable for battery applications

Applications

• Portable electronic devices requiring low standby current
• Microprocessor system reset circuits
• Battery-powered equipment monitoring
• General purpose voltage supervision in consumer electronics

Procurement Notes

Verify the Not Recommended for New Designs (NRND) status before procurement. Confirm that the SSOP-5 package and 2.3V threshold meet specific design requirements. Ensure compatibility with existing PCB layouts as this component is being phased out in favor of newer alternatives like the BD5223G series.

Selection Notes

Select this component only for legacy system maintenance or existing product support. Consider the BD5223G-1 as a recommended replacement with similar pinout and package. Evaluate if the open-drain output of the replacement suits the application, as the BU4323G uses a CMOS push-pull output. Verify thermal performance within the specified operating temperature range.

Part Context

This part belongs to the BU42(43)xxG series of supervisory circuits. It is manufactured by ROHM Semiconductor and falls under the PMIC category. The device is specifically engineered for low-voltage detection applications where precise timing and low power are critical. It is distinct from other series members by its specific 2.3V threshold and adjustable delay characteristics.

Replacement Considerations

The BD5223G-1 is a recommended replacement with the same pinout and SSOP5 package. Note differences in output type (open drain vs CMOS) and operating voltage range when substituting.