BU4218G-TR

Overview

The BU4218G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single power supply lines. It features an adjustable reset delay timer and operates within a supply voltage range of 0.7 V to 7 V. The device provides a threshold detection voltage of 1.8 V with a precision of ±1%. It utilizes an open-drain output type and maintains low power consumption with a circuit current of 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V. The component supports an operating temperature range from -40°C to +125°C and is housed in an SSOP-5 package.

Feature Summary

• Adjustable reset delay timer functionality allows customization of the reset pulse width via external components.
• Low power consumption design suitable for battery-operated applications with minimal standby current draw.
• Open-drain output configuration enables flexible interfacing with various logic families.

Applications

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

Procurement Notes

Verify the obsolete status before procurement as this part is not recommended for new designs. Confirm availability through authorized distributors or secondary markets. Ensure compatibility with existing PCB layouts due to the SSOP-5 package dimensions. Check RoHS compliance documentation for specific manufacturing dates. Validate replacement options if long-term supply assurance is required for production runs.

Selection Notes

Select this component when an adjustable delay time is required for reset signal generation. Consider the 1.8 V threshold accuracy for precise voltage monitoring needs. Evaluate the low quiescent current against system power budgets. Ensure the open-drain output matches the downstream logic requirements. Verify that the wide operating temperature range meets environmental specifications.

Part Context

This component belongs to the BU42xxG series of voltage detectors from ROHM Semiconductor. It shares functional similarities with other parts in the family but is distinguished by its specific 1.8 V threshold and adjustable delay feature. The series is known for low power operation and compact packaging solutions for portable electronics.

Replacement Considerations

The BD5218G-1 is a recommended replacement with the same pinout and package. Verify electrical parameter differences such as precision and current consumption during substitution.