BU4245F-TR

Overview

The BU4245F-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervisory circuit applications. It features an adjustable delay timer and an open-drain output active low. The typical under-voltage detection threshold is 4.5V with a precision of ±1%. The reset active voltage range spans from 0.7V to 7V. Operating current is specified at 0.40μA (ON) and 0.55μA (OFF) at VDET=4.8V. Hysteresis is set at VDET x 0.05. The device supports a supply voltage up to 7V and operates within a temperature range of -40°C to 125°C. It is housed in a 4-SOP package.

Feature Summary

• Adjustable delay timer functionality for customizable reset timing
• Open-drain output configuration with low-active reset state
• High accuracy voltage detection with ±1% precision
• Wide operating temperature range suitable for industrial environments

Applications

• Power supply monitoring systems
• Microcontroller reset circuits
• Embedded system supervision
• Battery backup switching logic

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm package integrity and RoHS compliance before integration. Check latest manufacturer notices for last-time-buy deadlines. Ensure storage conditions meet moisture sensitivity level requirements. Validate pinout compatibility with existing PCB layouts prior to procurement.

Selection Notes

Select this component when precise voltage monitoring with adjustable reset delays is required. Consider the open-drain output capability for interfacing with various logic levels. Evaluate the wide temperature range for harsh environment deployments. Compare power consumption metrics against alternative supervisors. Verify package dimensions fit within spatial constraints of the target design.

Part Context

Part of the BU42xx series of voltage detectors from Rohm Semiconductor. Designed for simple reset and power-on reset applications. Complements other PMIC offerings in the company's portfolio. Provides reliable supervision for digital circuits requiring stable power sequencing.

Replacement Considerations

BD5245G-1TR is documented as a recommended replacement with same pinout. Note package difference: BD5245G-1 uses SSOP5 while BU4245F uses SOP4. Verify electrical parameter compatibility during substitution.