BU45K472G-TL

Overview

The BU45K472G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring single-input power supplies. It features an open-drain output and operates within a supply voltage range of 0.6 V to 6 V. The threshold voltage is precisely set at 4.7 V with ±1% accuracy. A fixed reset delay timer of 200 ms ensures stable signal generation. The device consumes 2.8 µA in the active state and functions reliably across a temperature range of -40°C to +105°C. It is housed in a compact SSOP-3 package.

Feature Summary

• Provides precise voltage supervision with a fixed 4.7 V detection threshold and high accuracy.
• Generates reliable reset signals using a fixed 200 ms delay timer to prevent false triggering.
• Maintains low power consumption suitable for battery-operated applications.

Applications

• Monitoring power supply voltages in portable electronic devices
• Supervising microcontroller reset lines in embedded systems
• Protecting memory circuits during power-down sequences

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status via official documentation. Check current lifecycle status as this part may be restricted for new designs. Ensure storage conditions account for moisture sensitivity levels specified in the datasheet. Validate package markings against official specifications to avoid counterfeit components.

Selection Notes

Select this component when a fixed 4.7 V threshold with high precision is required. Consider the 200 ms fixed delay for timing stability needs. Evaluate the SSOP-3 package for space-constrained PCB layouts. Compare operating current requirements against system power budgets. Verify compatibility with downstream logic levels due to the open-drain output configuration.

Part Context

This voltage detector belongs to the BU45/BU46 series of supervisory circuits. It shares functional similarities with other parts in the family but differs in specific threshold voltages and packaging options. The series is designed for general-purpose power management tasks requiring simple, reliable voltage monitoring without complex configuration interfaces.

Replacement Considerations

The BD5247G-1 is listed as a similar specification replacement. Note that the substitute uses an SSOP-5 package instead of SSOP-3, requiring layout adjustments. The BD5247G-1 offers adjustable delay rather than fixed delay, which may impact timing behavior. Verify pinout compatibility before substitution.