BU46K244G-TL

Overview

The BU46K244G-TL is a CMOS voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring single-input power supplies. It features a fixed threshold voltage of 2.4 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.6 V to 6 V and includes a built-in counter timer delay circuit that provides a fixed reset delay time of 400 ms, eliminating the need for external capacitors. It draws a typical operating current of 2.8 µA and functions across a temperature range of -40°C to +105°C. The component is housed in an SSOP-3 package.

Feature Summary

• Built-in counter timer delay circuit eliminates the requirement for external capacitors for delay time setting
• CMOS output type with no manual reset or watchdog timer functionality
• Highly accurate voltage detection with ±1% precision at the threshold

Applications

• Monitoring battery-powered devices requiring low current consumption
• Supervising microprocessor reset lines in embedded systems
• Power management circuits in portable electronic equipment

Procurement Notes

Verify the Not Recommended for New Design (NRND) status before implementation. Confirm availability through authorized distributors as production may be limited. Ensure the SSOP-3 package dimensions match the target PCB footprint. Check humidity sensitivity levels for proper storage and handling requirements during assembly.

Selection Notes

Select this component when a fixed 2.4 V threshold is required with minimal external component count. The integrated delay circuit simplifies design compared to variable delay detectors. Consider the 2.8 µA quiescent current for battery life calculations. Verify compatibility with system logic levels given the CMOS output structure.

Part Context

This part belongs to the BU45/BU46 series of voltage detector ICs known for high accuracy and low power consumption. The series offers various threshold voltages and packages. The BU46K244G-TL specifically targets applications needing precise 2.4 V monitoring with a standard 400 ms delay period in a compact surface-mount package.

Replacement Considerations

Public documentation confirms BD5229G-1 as a similar specification replacement. Note that the substitute uses an SSOP-5 package instead of SSOP-3, requiring layout adjustment. The replacement offers adjustable delay rather than fixed delay.