BU4918G-TR

Supervisors Overview

The BU4918G-TR is a CMOS voltage detector IC from the BU49xx series, designed for high-accuracy monitoring with low current consumption. It features a fixed under-voltage detection threshold of 1.8V with ±1% precision. The device operates within a supply voltage range of 0.7V to 7V and provides a CMOS reset output active at low level. It includes a hysteresis voltage defined as Vdet multiplied by 0.05. The component is housed in an SSOP-5 package and supports operation across a temperature range of -40°C to +125°C.

Supervisors Feature Summary

• High-accuracy voltage detection with ±1% precision threshold
• Low power consumption suitable for battery-operated applications
• CMOS output type with active-low reset signal
• Integrated hysteresis to prevent output oscillation

Supervisors Applications

• Microprocessor system reset circuits
• Battery-powered device supervision
• Portable electronic equipment power management
• Embedded system voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix G-TR against the official datasheet to confirm the tape-and-reel packaging configuration. Ensure the part number matches the exact detection voltage of 1.8V required for the design. Confirm RoHS compliance status through the manufacturer's documentation before procurement. Check for any obsolescence notices or lifecycle status updates directly from ROHM Semiconductor sources.

Supervisors Selection Notes

Select this component when a precise 1.8V detection threshold is required for supervisory applications. The fixed threshold eliminates the need for external resistor networks, simplifying the circuit design. Consider the low operating current for energy-efficient designs. Verify that the SSOP-5 package fits the available PCB space and thermal requirements.

Supervisors Part Context

The BU4918G-TR belongs to the BU49xx series of standard CMOS reset ICs produced by ROHM Semiconductor. This series offers various detection voltages ranging from 0.9V to 4.8V in 0.1V increments. The BU4918G specifically targets applications requiring a 1.8V monitoring point. It is part of a broader lineup designed for compact, low-power electronic systems.

Supervisors Replacement Considerations

The BD5218G-1 is listed as a similar level replacement with the same package and detection voltage. Verify compatibility regarding electrical characteristics and pinout before substitution.