BU45K244G-TL

Supervisors Overview

The BU45K244G-TL is a 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 consumes a typical operating current of 2.8 µA. It provides a CMOS output type and includes a built-in reset delay timer of 400 ms, eliminating the need for external capacitors. The component is housed in an SSOP-3 package and supports an operating temperature range from -40°C to +105°C.

Supervisors Feature Summary

• Built-in counter timer delay circuit removes the requirement for external delay-setting capacitors.
• CMOS output configuration ensures compatibility with standard digital logic interfaces.
• High detection accuracy of ±1% maintains reliable voltage supervision across the operating range.

Supervisors Applications

• Portable electronic devices requiring low standby current consumption
• Battery-powered systems needing precise under-voltage detection
• Embedded controllers requiring stable reset signals during power transitions

Supervisors Procurement Notes

Verify the obsolete status indicated by the NRND designation before procurement. Confirm that existing inventory meets project requirements as new design support is discontinued. Ensure the SSOP-3 package dimensions align with the target PCB footprint. Validate that the CMOS output level matches the downstream logic input specifications. Check humidity sensitivity handling requirements during storage and assembly.

Supervisors Selection Notes

Select this component when a fixed 2.4 V threshold with CMOS output is required. The 400 ms delay suits applications tolerant of longer startup times. Compare against BU46K244G-TL if open-drain output is preferred instead of CMOS. Consider the 2.8 µA quiescent current for battery life calculations. Verify that the 6 V maximum supply voltage covers the system's peak rail conditions.

Supervisors Part Context

This part belongs to the BU45/BU46 series of highly accurate, low-current voltage detectors. The series distinguishes itself through integrated delay timers and high precision. The BU45 variant specifically utilizes a CMOS output structure, differing from the open-drain outputs found in other series members. This classification places it within ROHM's specialized PMIC supervisory circuits portfolio.

Supervisors Replacement Considerations

The BD5242G-1 is listed as a similar specification replacement. Note that the BD5242G-1 uses an SSOP-5 package and adjustable delay, requiring layout changes. Direct pin-to-pin substitution is not possible due to the package difference. Evaluate the adjusted current consumption and delay flexibility against the fixed parameters of the BU45K244G-TL.