BU4239G-TR

Overview

The BU4239G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It features an adjustable reset delay timer and an open-drain output type. The device operates within a supply voltage range of 0.7 V to 7 V, with a typical under-voltage detection threshold of 3.9 V. It exhibits high precision with a detection accuracy of ±1%. The component supports an adjustable reset delay time and maintains low power consumption, drawing approximately 0.40 μA in the ON state and 0.55 μA in the OFF state at VDET=4.8V. It functions reliably across a temperature range of -40°C to +125°C.

Feature Summary

• Provides precise under-voltage detection with adjustable reset delay timing capabilities.
• Features an open-drain output suitable for interfacing with various logic families.
• Operates with minimal current consumption to support battery-powered applications.

Applications

• Monitoring microprocessor power supply rails
• Battery-operated electronic devices requiring low standby current
• Portable equipment needing reliable voltage supervision

Procurement Notes

Verify the supply status carefully as this component is marked Not Recommended for New Designs (NRND). Confirm that existing inventory meets project requirements before finalizing procurement plans. Ensure compatibility with the SSOP-5 package dimensions and check RoHS compliance documentation for regulatory adherence in target markets.

Selection Notes

Select this part when a fixed 3.9 V threshold with adjustable delay is required. Compare against the BD5239G-1 for potential future-proofing, as it serves as a recommended replacement with similar pinout and package characteristics. Evaluate the open-drain output requirement against CMOS output alternatives if active-high signaling is preferred without external pull-ups.

Part Context

This component belongs to the BU42(43)xxG series of voltage detectors from ROHM. It shares architectural similarities with other parts in the lineup but is distinguished by its specific 3.9 V detection threshold and open-drain configuration. The series is known for high accuracy and low power consumption in supervisory circuit applications.

Replacement Considerations

The BD5239G-1 is identified as a recommended replacement with the same pinout and package. Verify electrical parameter differences, such as precision and operating voltage ranges, during transition planning.