BD4947G-TR

Overview

The BD4947G-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It features a fixed threshold detection voltage of 4.7 V with high accuracy of ±1%. The device operates within a wide supply voltage range up to 10 V and delivers a CMOS output signal that goes active low when the monitored voltage drops below the threshold. It includes a reset delay timer of 100 µs to ensure stable operation during power transitions. The component supports an operating temperature range from -40°C to +105°C and is housed in a compact 5-pin SSOP package.

Feature Summary

• Provides precise voltage supervision with a fixed 4.7 V detection threshold and ±1% accuracy.
• Generates a low-active CMOS reset signal upon undervoltage conditions.
• Incorporates a 100 µs reset delay timer to prevent false triggering during power-up or noise events.
• Operates reliably across an extended industrial temperature range of -40°C to +105°C.

Applications

• Monitoring main power rails in embedded systems and microcontrollers.
• Supervising battery-powered devices requiring stable voltage thresholds.
• Ensuring system integrity in industrial control equipment under varying thermal conditions.

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance and packaging specifications (Reel/Cut Tape) against current inventory sources. Cross-reference datasheet revisions to ensure parameter consistency with design requirements before final procurement decisions.

Selection Notes

Select this component for applications requiring a fixed 4.7 V threshold with CMOS output compatibility. Consider the 100 µs delay timer for noise immunity needs. Evaluate the SSOP-5 package size constraints and operating temperature range suitability for the target environment compared to alternative supervisory circuits.

Part Context

The BD4947G-TR belongs to the BD49 series of standard voltage detectors from ROHM Semiconductor. This series focuses on providing reliable power management supervision with fixed thresholds and simple interface requirements. The part is designated as Not Recommended for New Designs, indicating it is being phased out in favor of newer alternatives like the BD5247G-1.

Replacement Considerations

The BD5247G-1 is a recommended replacement offering similar package dimensions and detection voltage. Note differences in output type (Open Drain vs. CMOS), adjustable delay capabilities, and updated electrical characteristics when transitioning designs.