BU45K274G-TL

Supervisors Overview

The BU45K274G-TL is a fixed delay time voltage detector IC from ROHM Semiconductor, designed for monitoring supply voltages in electronic circuits. It features a threshold voltage of 2.7 V with ±1% accuracy and operates within a detection range of 0.6 V to 6 V. The device provides an open-drain output and includes a built-in counter timer that eliminates the need for external capacitors, offering a fixed reset delay of 400 ms. It consumes low current (2.8 µA typical) and functions across a temperature range of -40°C to +105°C in an SOT-23-3 package.

Supervisors Feature Summary

• Built-in counter timer circuit removes the requirement for external delay-setting capacitors
• High detection accuracy of ±1% ensures reliable voltage monitoring
• Low current consumption design supports battery-powered applications
• Fixed 400 ms reset delay prevents false triggering during power-up

Supervisors Applications

• Microprocessor system reset circuits
• Battery voltage monitoring in portable devices
• Power supply supervision in embedded systems

Supervisors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to obsolete status. Confirm RoHS compliance and packaging details (cut tape/reel) as availability varies. Request original datasheets and test reports to ensure parameter consistency. Check for moisture sensitivity handling requirements prior to assembly. Validate pinout compatibility with existing PCB layouts before procurement.

Supervisors Selection Notes

Select this component when a fixed 400 ms delay is acceptable without external components. Compare against adjustable delay variants if timing flexibility is required. Ensure the 2.7 V threshold matches the target system’s minimum operating voltage. Verify open-drain output compatibility with downstream logic levels. Consider thermal performance within the specified -40°C to +105°C range for environmental suitability.

Supervisors Part Context

Part of the BU45/BU46 series of voltage detectors, which share similar architectural features including internal timers and low power operation. This model specifically uses an SOT-23-3 package and open-drain output configuration. The series is designed for cost-sensitive, space-constrained applications requiring precise voltage supervision without additional passive components.

Supervisors Replacement Considerations

BD5227G-1 is listed as a recommended replacement with similar specifications but offers adjustable delay instead of fixed. Verify functional equivalence regarding output type, current consumption, and package dimensions before substitution.