BU45K304G-TL

Overview

The BU45K304G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages. It features a typical detection threshold of 3.0V with ±1% precision and operates within a reset active voltage range of 0.6V to 6V. The device provides an open-drain output with a fixed delay timer of 400ms and consumes only 2.8µA in the off state. It supports a maximum operating voltage of 6V and functions across a temperature range of -40°C to +105°C.

Feature Summary

• Built-in fixed delay timer eliminates the need for external capacitors
• High accuracy voltage detection with ±1% precision
• Low current consumption suitable for battery-powered applications
• Open-drain output configuration for flexible interfacing

Applications

• Microprocessor system reset circuits
• Battery voltage monitoring
• Power supply supervision
• Electronic equipment under-voltage protection

Procurement Notes

Verify component authenticity through authorized channels due to NRND status. Confirm package integrity as moisture sensitivity requires proper handling. Check RoHS compliance documentation before integration. Ensure ordering suffix matches required tape-and-reel specifications. Validate supplier authorization to avoid counterfeit risks.

Selection Notes

Select this component when a fixed 400ms delay is sufficient without external timing components. Consider the open-drain output requirement for pull-up resistor implementation. Evaluate the 3.0V threshold against target supply rails. Verify compatibility with SSOP-3 footprint constraints in dense PCB layouts.

Part Context

This part belongs to the BU45/BU46 series of highly accurate, low-current voltage detectors. The series integrates counter timer delay circuits internally, simplifying design by removing external delay-setting capacitors. The BU45K304G-TL variant specifically offers an open-drain output and fixed delay characteristics within this family.

Replacement Considerations

BD5230G-1 is listed as a similar specification replacement with adjustable delay and CMOS output.