BU4218F-TR

Overview

The BU4218F-TR is a voltage detector with an adjustable delay time, manufactured by ROHM Semiconductor. It features a typical under-voltage detection voltage of 1.8V and a precision of ±1%. The reset active voltage range spans from 0.7V to 7V, utilizing an open-drain output type. The circuit current is 0.40μA when ON and 0.55μA when OFF at VDET=4.8V. Hysteresis voltage is defined as VDET x 0.05. The L output current is 3.3mA at low voltage and 6.5mA at high voltage. The delay circuit resistance is 10.0MΩ. Operating temperature ranges from -40°C to 125°C. The package is SOP4 with dimensions 2.0x2.1mm.

Feature Summary

• Features an adjustable delay timer for customizable reset timing.
• Provides precise under-voltage detection with hysteresis to prevent false triggering.
• Utilizes an open-drain output configuration for flexible interfacing.

Applications

• Power supply monitoring in electronic devices
• Microcontroller system supervision
• Battery backup circuit protection

Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet before procurement. Confirm that the component meets RoHS compliance requirements for your region. Check the supply status as this part may be subject to end-of-life restrictions or last-time buy conditions. Ensure the selected distributor provides authentic components with traceable documentation.

Selection Notes

Select this component when an adjustable delay timer is required for voltage supervision. Consider the open-drain output capability for compatibility with various logic levels. Evaluate the operating temperature range to ensure suitability for the intended environmental conditions. Compare the power consumption metrics against system battery life requirements.

Part Context

The BU4218F-TR belongs to the BU42xxF series of voltage detectors from ROHM Semiconductor. This series is designed for low-power applications requiring reliable under-voltage detection. The device is commonly used in portable electronics and industrial control systems where power management is critical.

Replacement Considerations

The BD5218G-1 is listed as a recommended replacement with the same pinout. Verify compatibility regarding package differences (SSOP5 vs SOP4) and electrical parameter variations such as reset active voltage range and output current capabilities.

FAQ

What is the typical under-voltage detection voltage for the BU4218F-TR?

The typical under-voltage detection voltage is 1.8V.

Does the BU4218F-TR include a manual reset function?

No, the BU4218F-TR does not include a manual reset function.

What is the maximum operating temperature for this component?

The maximum operating temperature is 125°C.