BU4325G-TR

Overview

The BU4325G-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for monitoring power supply voltages in electronic systems. It operates within a supply voltage range of 0.7 V to 7 V and features a detection threshold of 2.5 V with ±1% accuracy. The device provides an adjustable reset delay timer and outputs a low-active signal via a CMOS interface. It supports surface-mount installation in a 5-SSOP package and functions reliably across a temperature range of -40°C to 125°C.

Feature Summary

• Provides simple reset or power-on reset functionality with a low-active output state.
• Features an adjustable reset delay timer to accommodate specific system startup requirements.
• Utilizes a CMOS output interface compatible with standard digital logic levels.

Applications

• Microprocessor power supply monitoring
• Portable battery-powered equipment
• Test and measurement instruments

Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before integration into new products. Confirm that the 5-SSOP package dimensions match the target PCB footprint. Ensure the 2.5 V threshold aligns with the monitored rail's minimum operating voltage. Check RoHS compliance documentation for environmental regulations. Validate that the adjustable delay circuitry meets the required timing specifications for the application.

Selection Notes

Select this component when a fixed 2.5 V threshold is appropriate for the monitored voltage rail. The adjustable delay feature allows customization of reset timing without external components. The CMOS output simplifies interfacing with microcontrollers. Consider the wide operating temperature range for industrial or automotive environments. Verify that the single-channel design suffices for the system's monitoring needs.

Part Context

This part belongs to the BU43xx series of voltage detectors from Rohm Semiconductor. It is functionally similar to other parts in the family but distinguished by its specific 2.5 V threshold voltage. The series is designed for general-purpose power supervision in portable and industrial electronics.

Replacement Considerations

The BD5225G-1 is listed as a replacement with the same pinout and package. Note differences in output type (open drain vs. CMOS) and current drive capabilities. Verify compatibility with existing circuit designs before substitution.

FAQ

Is the reset delay time fixed or adjustable?

The reset delay time is adjustable, allowing users to customize the delay using external components.

What is the active state of the reset output?

The reset output is active low, meaning it asserts a low signal when the monitored voltage falls below the threshold.