BU4937F-TR

Supervisors Overview

The BU4937F-TR is a standard CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply voltages. It features a typical under-voltage detection threshold of 3.7V with a precision of ±1%. The device operates within a reset active voltage range of 0.7V to 7V and utilizes a CMOS output type. It does not include manual reset or watchdog timer functions. The circuit current consumption is specified at 0.40μA when ON (at Vdet=4.8V) and 0.55μA when OFF. Hysteresis is set at Vdet x 0.05. It supports an operating temperature range from -40°C to +125°C and is housed in a SOP-4 package.

Supervisors Feature Summary

• CMOS output interface for direct logic compatibility
• Ultra-low current consumption for battery efficiency
• High accuracy voltage detection with built-in hysteresis

Supervisors Applications

• Power supply supervision in portable electronic devices
• Monitoring battery voltage levels in handheld equipment
• Reset signal generation for microprocessor systems

Supervisors Procurement Notes

Verify the component status as Last Time Buy before finalizing procurement plans. Confirm that the SOP-4 package and 3.7V threshold align with existing design requirements. Ensure compliance with RoHS standards if applicable to the target market. Check for any specific handling instructions related to the end-of-life status.

Supervisors Selection Notes

Select this component for applications requiring precise voltage monitoring with minimal power drain. The CMOS output simplifies integration with digital logic circuits. Consider the wide operating temperature range for robust performance in varying environmental conditions. Evaluate the lack of adjustable delay against system timing requirements.

Supervisors Part Context

This part belongs to the BU49xx series of standard CMOS voltage detectors from ROHM. It is positioned as a high-accuracy, low-current solution for power management. The series offers various detection voltages and output types to suit different application needs, providing a reliable option for supervisory circuits in consumer electronics.

Supervisors Replacement Considerations

The BD5237G-1 is listed as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package instead of SOP-4, requiring PCB layout adjustments. Verify pinout compatibility and electrical parameter alignment before substitution.