BU4339G-TR

Overview

The BU4339G-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for monitoring single power supply lines. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The device provides a typical under-voltage detection threshold of 3.9 V with ±1% accuracy. It draws a maximum operating current of 550 nA and includes hysteresis defined as VDET x 0.05. The component is housed in an SSOP-5 package and supports an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• CMOS output structure providing low quiescent current consumption
• Adjustable reset delay timer utilizing external resistance
• Integrated hysteresis function to prevent output oscillation
• Single-channel under-voltage detection capability

Applications

• Portable electronic devices requiring low power supervision
• Battery-powered systems needing reliable voltage monitoring
• Industrial control equipment operating in wide temperature ranges

Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet before procurement. Confirm that the selected part matches the required detection voltage and delay characteristics. Ensure compliance with RoHS standards and check for any lifecycle status changes such as NRND or Last Time Buy designations. Cross-reference pinouts if substituting into existing designs.

Selection Notes

Select this component when a low-power, single-supervisor circuit with adjustable timing is required. The CMOS output type suits digital logic interfaces directly. Consider the 550 nA current draw for battery life optimization. Verify that the 3.9 V threshold aligns with the system's minimum operating voltage requirements and that the SSOP-5 footprint fits the PCB layout constraints.

Part Context

This part belongs to the BU43xx series of voltage detectors from ROHM Semiconductor. These components are classified under Supervisory Circuits within Power Management ICs. The series is characterized by low current consumption and adjustable delay features, targeting applications where precise power sequencing and monitoring are critical for system stability.

Replacement Considerations

BD5239G-1 is a recommended replacement with the same pinout and package.