BU4938G-TR

Supervisors Overview

The BU4938G-TR is a CMOS voltage detector IC from ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed threshold detection voltage of 3.9 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.7 V to 7 V and consumes a typical static current of 500 nA. It provides a single monitored input with a CMOS output type and lacks manual reset or watchdog timer functions. The component is housed in an SSOP-5 package and supports an operating temperature range from -40°C to +125°C.

Supervisors Feature Summary

• CMOS output interface for direct logic integration
• High detection accuracy with ±1% precision
• Ultra-low power consumption suitable for battery-operated devices
• Wide operating temperature range for industrial environments

Supervisors Applications

• Microcontroller system supervision
• Logic circuit power monitoring
• Battery-powered electronic devices
• Portable equipment voltage tracking

Supervisors Procurement Notes

Verify the specific lot date code and RoHS compliance status upon order confirmation, as the component is marked Not Recommended for New Designs (NRND). Ensure that the SSOP-5 package dimensions match the target PCB footprint. Confirm availability through authorized distributors, as production status may affect long-term supply continuity.

Supervisors Selection Notes

Select this part when a fixed 3.9 V threshold is required without adjustable delay or manual reset capabilities. The CMOS output drives higher currents compared to open-drain variants, making it suitable for direct interfacing with standard logic families. Consider the wide temperature range if the application operates in extreme environmental conditions.

Supervisors Part Context

This component belongs to the BU49xx series of standard voltage detectors manufactured by ROHM Semiconductor. The series offers various detection voltages in 0.1 V increments, allowing precise selection for different rail monitoring needs. The BU4938G-TR specifically targets applications requiring reliable low-voltage detection with minimal quiescent current draw.

Supervisors Replacement Considerations

The BD5238G-1 is documented as a replacement with the same SSOP-5 package. Note that the substitute features an open-drain output and adjustable delay timer, which differs from the BU4938G-TR's CMOS output and fixed timing characteristics.