BD45475G-TR

Overview

The BD45475G-TR is a voltage detector manufactured by Rohm Semiconductor, designed for monitoring single-channel power supply voltages. It features a fixed delay time of 50 milliseconds and an open-drain output type with low-active reset state. The typical under-voltage detection threshold is set at 4.7 volts, with a precision of ±1 percent. The device supports a manual reset function and operates within a reset active voltage range of 0.95 to 10 volts. It consumes a circuit current of 0.80 microamperes in the ON state and 0.85 microamperes in the OFF state at VDET=4.8V. The component is housed in a 5-SSOP package (SC-74A/SOT-753) and is rated for an operating temperature range from -40°C to +105°C.

Feature Summary

• Fixed 50ms delay timer ensures stable reset signal generation after voltage recovery.
• Manual reset capability allows external control over the reset state via dedicated input.
• Open-drain output interface provides flexibility for interfacing with various logic levels.
• High accuracy voltage detection with ±1% precision minimizes false triggering risks.

Applications

• Microprocessor system supervision
• Power supply monitoring circuits
• Embedded system reset management

Procurement Notes

Verify the obsolete status and last-time-buy designation before procurement. Confirm availability through authorized distributors as standard supply may be limited. Ensure RoHS compliance documentation matches project requirements. Check lead times carefully due to potential discontinuation. Validate that the SSOP-5 package dimensions fit the target PCB layout constraints.

Selection Notes

Select this component when a fixed delay reset is required without adjustable timing complexity. Consider the open-drain output compatibility with downstream logic families. Evaluate the manual reset feature necessity against automatic-only alternatives. Compare static current consumption against battery-operated application limits. Verify the 4.7V threshold aligns with the monitored rail's nominal voltage level.

Part Context

This part belongs to the BD45xxx series of voltage detectors from Rohm Semiconductor. It is specifically engineered for applications requiring reliable supervision of digital systems. The fixed delay characteristic distinguishes it from adjustable delay variants in the broader product line. It serves as a critical component for ensuring proper system initialization and recovery from brown-out events.

Replacement Considerations

BD5247G-1 is listed as a recommended replacement with similar specifications and package compatibility.