BU45K422G-TL

Supervisors Overview

The BU45K422G-TL is a fixed-delay voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply voltages. It features a typical threshold voltage of 4.2 V with a precision of ±1%. The device operates within a reset active voltage range of 0.6 V to 6 V and utilizes an open-drain output type. It incorporates a fixed reset delay timer of 200 ms and lacks manual reset or watchdog functionalities. The component supports surface-mount installation in an SSOP-3 package, consumes 2.8 µA of operating current, and functions reliably across a temperature range of -40°C to +105°C.

Supervisors Feature Summary

• Provides precise voltage supervision with a fixed 4.2 V detection threshold and high accuracy.
• Ensures stable system initialization through a dedicated 200 ms fixed delay timer.
• Offers low power consumption suitable for battery-operated applications.

Supervisors Applications

• Monitoring microprocessor power supply rails
• Supervising battery-powered electronic devices
• Providing reset signals for digital logic circuits

Supervisors Procurement Notes

Verify the NRND (Not Recommended for New Designs) status before procurement, as this indicates the component is not intended for new designs. Confirm that the SSOP-3 package and 4.2 V threshold align with existing schematic requirements. Check for moisture sensitivity levels if storage conditions are critical. Ensure compatibility with the open-drain output configuration in the target circuit design.

Supervisors Selection Notes

Select this component when a fixed 4.2 V threshold is required for voltage supervision. Consider the 200 ms delay for systems needing extended stabilization time. Evaluate the SSOP-3 package size against available PCB space. Compare the 2.8 µA quiescent current against other detectors if ultra-low power is a primary constraint. Verify that the open-drain output matches the pull-up requirements of the connected logic.

Supervisors Part Context

This part belongs to the BU45/BU46 series of voltage detectors from ROHM Semiconductor. These components are specialized supervisory circuits designed for reliable power management in compact electronic systems. The series typically offers various threshold voltages and packages to suit different application needs while maintaining consistent performance characteristics.

Supervisors Replacement Considerations

The BD5242G-1 is listed as a similar specification replacement option. Verify package compatibility between SSOP-3 and SSOP-5, and confirm electrical parameter alignment including threshold voltage and delay times before substitution.