BU45K392G-TL

Overview

The BU45K392G-TL is a fixed-delay type voltage detector IC from ROHM Semiconductor, designed for monitoring single-input power supply voltages. It features a threshold voltage of 3.9 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.6 V to 6 V and includes a built-in reset delay timer of 200 ms, eliminating the need for external capacitors. It utilizes an open-drain output configuration and consumes a typical operating current of 2.8 µA. The component is housed in an SSOP-3 package and supports operation across a temperature range of -40°C to +105°C.

Feature Summary

• Built-in counter timer delay circuit removes requirement for external delay-setting capacitors
• High detection accuracy maintained at ±1% threshold voltage precision
• Low current consumption design suitable for battery-powered applications
• Single-input monitoring capability with open-drain output interface

Applications

• Microcontroller system reset circuits
• Battery voltage monitoring in portable devices
• Power supply supervision in embedded systems
• Voltage level detection in industrial control equipment

Procurement Notes

Verify component authenticity through authorized channels as this part is marked obsolete. Confirm package integrity and pin alignment due to limited availability. Check RoHS compliance documentation for specific manufacturing lot requirements. Ensure storage conditions meet humidity sensitivity standards prior to use. Validate replacement compatibility if sourcing from secondary markets.

Selection Notes

Consider the BD5239G-1 as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package instead of SSOP-3. Verify pinout compatibility before integration into existing designs. The replacement offers adjustable delay timing compared to the fixed delay of the original component. Evaluate current consumption differences between the two devices for power-sensitive applications.

Part Context

This component belongs to the BU45/BU46 series of voltage detector ICs characterized by high accuracy and low power consumption. The series integrates internal delay timers to simplify circuit design. The BU45K392G-TL specifically provides a 3.9 V detection threshold with open-drain output. It is part of ROHM's portfolio for supervisory circuits requiring precise voltage monitoring without external timing components.

Replacement Considerations

BD5239G-1TR is listed as a recommended replacement with similar specification levels. The substitute maintains comparable detection voltage and output type but differs in package form factor and delay adjustability.