BU4940G-TR

Supervisors Overview

The BU4940G-TR is a voltage detector IC manufactured by Rohm Semiconductor, designed for supervisory circuit applications. It operates within a supply voltage range of 0.7 V to 7 V and features a fixed threshold voltage of 4 V with ±1% accuracy. The device utilizes a CMOS output type in a push-pull/totem pole configuration, providing active low reset signals without manual reset or watchdog timer functions. Packaged in a compact 5-pin SSOP (SC-74A) format, it supports surface mount installation and functions reliably across an extended temperature range from -40°C to +125°C.

Supervisors Feature Summary

• CMOS output interface with push-pull drive capability
• Fixed 4V detection threshold with high precision
• Compact 5-pin SSOP surface-mount packaging

Supervisors Applications

• Power supply monitoring systems
• Microprocessor reset circuits
• Battery voltage supervision

Supervisors Procurement Notes

Verify component authenticity through authorized distributors due to the Not Recommended for New Designs status. Confirm package integrity and pin alignment upon receipt. Ensure storage conditions comply with moisture sensitivity level requirements. Cross-reference datasheet revisions to match design specifications. Validate thermal performance against application constraints before final integration.

Supervisors Selection Notes

Select this component when a fixed 4V threshold with CMOS push-pull output is required. Consider the extended industrial temperature range for harsh environments. Evaluate the compact SSOP footprint for space-constrained layouts. Note that alternative parts may offer adjustable thresholds or different output configurations if system requirements evolve beyond basic voltage supervision needs.

Supervisors Part Context

This part belongs to Rohm's standard voltage detector family, specifically engineered for simple reset and power-on reset applications. It serves as a critical component in ensuring stable operation of digital logic circuits by monitoring supply rail integrity. The series is characterized by low current consumption and robust noise immunity, making it suitable for general-purpose electronic equipment requiring reliable power management supervision.

Supervisors Replacement Considerations

The BD5240G-1 is documented as a replacement with the same SSOP5 package. Verify output type differences, as the substitute uses open drain instead of CMOS push-pull. Check reset delay timer availability and current consumption variations. Ensure compatibility with existing PCB footprints and electrical interface requirements during transition.