BU4321G-TR

Overview

The BU4321G-TR is a CMOS low voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring power supply voltages in electronic systems. It features an adjustable reset delay timer and operates within a supply voltage range of 0.8 V to 6 V. The device provides a typical under-voltage detection threshold of 2.1 V with a precision of ±0.9%. It utilizes an SSOP-5 surface-mount package and supports non-inverting output configurations. The component functions as a supervisory circuit, ensuring system stability by detecting voltage drops below the set threshold.

Feature Summary

• CMOS technology ensures low power consumption during operation.
• Adjustable output delay timer allows customization of reset timing.
• High precision voltage detection maintains system reliability.

Applications

• Portable electronic devices requiring battery voltage monitoring
• Embedded systems needing power supply supervision
• Industrial control circuits with low voltage protection requirements

Procurement Notes

Verify the specific suffix G-TR against official ROHM documentation to confirm tape-and-reel packaging and pinout compatibility. Ensure the design-in process accounts for the NRND status if applicable to current production cycles. Cross-reference the SSOP-5 footprint dimensions with PCB layout guidelines to prevent assembly errors. Confirm RoHS compliance details through the manufacturer's latest certification documents before finalizing procurement orders.

Selection Notes

Select this component when a precise 2.1 V detection threshold is required for low-voltage applications. The adjustable delay feature makes it suitable for systems where noise immunity or startup sequencing is critical. Consider the SSOP-5 package size for space-constrained designs. Evaluate the CMOS output type compatibility with downstream logic levels to ensure proper signal interfacing without additional level shifting components.

Part Context

This part belongs to the BU43xx series of low voltage detectors from ROHM Semiconductor. It is functionally related to other variants in the family that offer different detection thresholds or package options. The series is designed for general-purpose power management tasks in consumer and industrial electronics. Understanding the broader family context helps in identifying alternative parts with similar electrical characteristics but different form factors or threshold values.

Replacement Considerations

The BD5221G-1 is listed as a recommended replacement with the same pinout and package. Verify electrical parameter equivalence, particularly the detection threshold and delay adjustability, before substitution. Ensure the replacement part meets all environmental and regulatory requirements of the original design.

FAQ

What is the typical under-voltage detection threshold for the BU4321G-TR?

The typical under-voltage detection threshold is 2.1 V.

Does the BU4321G-TR include a manual reset function?

No, the BU4321G-TR does not support manual reset; it relies on automatic detection and delay timing.

What is the operating temperature range for this component?

The component operates within a temperature range of -40°C to +125°C.