BU4326F-TR

Overview

The BU4326F-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply voltages. It operates within a supply voltage range of 0.7 V to 7 V and features an adjustable reset delay timer. The device provides a typical under-voltage detection threshold of 2.6 V with a precision of ±1%. It consumes a maximum operating current of 550 nA and supports a reset active state of Low. The component is housed in an SOP-4 package and functions reliably across a temperature range of -40°C to +125°C.

Feature Summary

• CMOS output type ensures low power consumption and compatibility with digital logic interfaces.
• Adjustable reset delay timer allows customization of the response time following voltage recovery.
• High accuracy detection threshold of ±1% ensures reliable system supervision under varying conditions.

Applications

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

Procurement Notes

Verify the specific suffix and packaging configuration against official datasheets before procurement. Confirm that the intended application environment falls within the specified operating temperature and voltage limits. Check for any regional distribution restrictions or end-of-life status updates from the manufacturer to ensure long-term availability and compliance with project requirements.

Selection Notes

Select this component when a single-channel voltage monitor with adjustable timing is required. Ensure the input voltage does not exceed the maximum rating of 7 V. Consider the SOP-4 package constraints for PCB layout. Verify that the CMOS output drive capability meets the load requirements of the connected microcontroller or logic gate without additional buffering.

Part Context

This part belongs to the BU42(43)xxF series of supervisory circuits from ROHM Semiconductor. It is specifically engineered for applications demanding low quiescent current and high detection accuracy. The SOP-4 package variant offers a compact footprint suitable for space-constrained designs while maintaining robust performance across industrial temperature ranges.

Replacement Considerations

The BD5226G-1 is listed as a similar specification replacement with the same pinout. Note that the BD5226G-1 uses an SSOP-5 package and an open-drain output, which may require circuit adjustments compared to the CMOS output of the BU4326F-TR.

FAQ

Does the BU4326F-TR include a manual reset function?

No, the BU4326F-TR does not feature a manual reset pin; it relies solely on automatic voltage detection for triggering resets.

What is the typical hysteresis voltage for this device?

The hysteresis voltage is typically defined as VDET multiplied by 0.05, providing noise immunity during voltage transitions.