BD4728G-TR

Overview

The BD4728G-TR is a voltage detector manufactured by ROHM Semiconductor, designed for monitoring a single supply voltage. It features a fixed threshold voltage of 2.8V with high accuracy of 1%. The device operates within a maximum power supply voltage of 10V and provides an open-drain output type. It includes manual reset functionality and has a reset delay time of 50 ms. The component supports surface-mount installation in an SSOP-5 package. Operating temperature range spans from -40°C to +105°C. Power dissipation is rated at 540 mW. Static current consumption is specified at 850 nA. This supervisory circuit is currently listed as obsolete.

Feature Summary

• Monitors a single voltage input to provide reliable supply-voltage supervision
• Generates an active-low reset signal when voltage falls below the specified threshold
• Features manual reset capability for system control flexibility
• Utilizes low static current consumption for energy-efficient operation

Applications

• Power-on reset circuits for microprocessors
• Voltage supervision for battery-powered devices
• System reset generation in embedded electronics
• Monitoring critical supply rails in industrial equipment

Procurement Notes

Verify component availability status carefully as this part is officially classified as obsolete or last-time buy by the manufacturer. Confirm that existing inventory sources are legitimate and traceable. Check datasheet revisions for any final design-in recommendations before procurement. Ensure compatibility with existing PCB layouts and thermal requirements. Validate that alternative components meet identical electrical specifications if substitution is necessary due to unavailability.

Selection Notes

Select this component only if its specific 2.8V threshold matches the target voltage level exactly. Consider the open-drain output requirement for pull-up resistor integration. Evaluate the SSOP-5 package constraints against available board space. Assess whether manual reset functionality aligns with system design needs. Verify operating temperature range suitability for the intended environment. Review power dissipation limits under worst-case conditions.

Part Context

The BD4728G-TR belongs to ROHM's supervisory circuits family, specifically voltage detectors. It serves as a simple reset IC for monitoring single voltage lines. The device is part of a discontinued product line, indicating it may be replaced by newer generations. Similar parts in the series include variants with different threshold voltages. The TR suffix denotes tape-and-reel packaging for automated assembly processes.

Replacement Considerations

Public confirmed substitute part numbers: None identified in official documentation.