BU45L452G-TL

Overview

The BU45L452G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring single-input power supplies. It features a threshold voltage of 4.5 V with ±1% accuracy and an open-drain output type. The device operates within a supply voltage range up to 6 V and includes a built-in counter timer providing a fixed reset delay of 200 ms, eliminating the need for external capacitors. It consumes 2.8 µA in the OFF state and functions across a temperature range of -40°C to +105°C. Hysteresis is set at VDET x 0.05. The component is housed in an SSOP-3 package.

Feature Summary

• Built-in counter timer circuit eliminates the requirement for external delay-setting capacitors
• High detection accuracy maintained at ±1% precision for reliable voltage monitoring
• Low current consumption design suitable for battery-powered applications
• Fixed reset delay time ensures consistent system initialization timing

Applications

• Microprocessor reset circuits requiring stable power-on sequencing
• Battery-operated devices needing low standby current supervision
• Industrial control systems operating in extended temperature environments
• Portable electronics utilizing single-supply voltage monitoring

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for moisture sensitivity labeling prior to handling. Ensure storage conditions meet specified humidity requirements to prevent package degradation. Validate that the SSOP-3 footprint matches your PCB design constraints before finalizing procurement decisions.

Selection Notes

Select this component when a fixed 200 ms delay is acceptable without external components. Consider the open-drain output compatibility with your logic levels. Evaluate the 4.5 V threshold against your specific supply rail requirements. Verify that the SSOP-3 package dimensions fit your available board space. Check if the ±1% accuracy meets your system tolerance needs.

Part Context

This part belongs to the BU45/BU46 series of voltage detectors known for high accuracy and low power consumption. The series integrates internal timers to simplify circuit design by removing external passive components. These ICs are widely used in consumer and industrial electronics where reliable power supervision is critical. The BU45L452G-TL specifically targets applications requiring a 4.5 V detection point with minimal quiescent current draw.

Replacement Considerations

BD5245G-1TR is listed as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package instead of SSOP-3, requiring layout adjustments. The replacement offers adjustable delay rather than fixed 200 ms. Verify pinout compatibility and electrical parameter alignment before substitution.