BU4818G-TR

Supervisors Overview

The BU4818G-TR is a CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring single-input power supply voltages. It operates within a supply voltage range of 0.7 V to 7 V and features an open-drain output type with low active state reset functionality. The device provides a typical under-voltage detection threshold of 1.8 V with a precision of ±1%. It includes hysteresis voltage defined as VDET x 0.05 and supports a reset active voltage range from 0.7 V to 7 V. The circuit current is specified at 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. It lacks manual reset, watchdog timer, and battery backup switch features. Operating temperatures span from -40°C to +125°C.

Supervisors Feature Summary

• CMOS technology ensures low power consumption suitable for battery-operated applications
• Open-drain output configuration allows flexible interfacing with various logic families
• Integrated hysteresis prevents output oscillation during voltage transitions near the threshold
• Wide operating temperature range supports reliable performance in harsh industrial environments

Supervisors Applications

• Portable electronic devices requiring precise power supply monitoring
• Industrial control systems needing voltage supervision under wide temperature variations
• Battery-powered equipment utilizing low quiescent current components
• Embedded systems requiring simple reset generation without complex supervisory features

Supervisors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to NRND status. Confirm RoHS compliance documentation matches specific production batches. Check datasheet revisions for any updates to electrical characteristics or package dimensions before finalizing procurement specifications.

Supervisors Selection Notes

Select this component when a fixed 1.8 V threshold is required for single-channel voltage monitoring. Consider the open-drain output compatibility with system logic levels. Evaluate thermal requirements against the -40°C to +125°C operating range. Note that replacement parts like BD5218G-1 offer similar packages but may differ in delay timer capabilities.

Supervisors Part Context

The BU4818G-TR belongs to ROHM's standard voltage detector family, characterized by CMOS construction and SSOP-5 packaging. It serves as a legacy component marked Not Recommended for New Designs (NRND), indicating limited future production support. Engineers often utilize existing designs incorporating this part while planning long-term migration strategies to recommended alternatives.

Supervisors Replacement Considerations

BD5218G-1TR is a recommended replacement offering identical SSOP-5 packaging and similar 1.8 V detection voltage. Verify functional differences such as adjustable delay timers and slight variations in output current capabilities during integration testing.