BD4745G-TR

Overview

The BD4745G-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervisory circuit applications. It features a fixed threshold voltage of 4.5V with a precision of ±1%. The device provides an open-drain output that asserts a low-active reset signal when the monitored voltage drops below the threshold. It operates within a supply voltage range of 0.8V to 10V and supports a manual reset function. The component is housed in a compact 5-SSOP (SC-74A) surface-mount package and is rated for an operating temperature range from -40°C to +75°C.

Feature Summary

• Fixed 4.5V detection threshold with high accuracy
• Open-drain output compatible with various logic levels
• Supports manual reset functionality for system control

Applications

• Microprocessor and microcontroller power supply monitoring
• Battery backup switching circuits
• Embedded system reset generation

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance and check for whisker information if required by assembly standards. Ensure storage conditions maintain moisture sensitivity level 1 integrity prior to soldering.

Selection Notes

Select this component for designs requiring a precise 4.5V supervision point without adjustable thresholds. Consider the open-drain output for flexible pull-up configurations. Evaluate thermal requirements against the -40°C to 75°C operational limit for industrial or consumer environments.

Part Context

This part belongs to the BD47xx series of standard voltage detectors from Rohm. It serves as a dedicated supervisor IC for ensuring reliable system startup and recovery during brown-out events. The TR suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly processes.

Replacement Considerations

BD5245G-1 is listed as a similar level replacement with the same package type and comparable electrical characteristics.