BD4742G-TR

Overview

The BD4742G-TR is a single-channel voltage detector manufactured by Rohm Semiconductor, designed for supervisory circuit applications. It features an open-drain or open-collector output with a low-active reset signal. The device monitors a specific threshold voltage of 4.2V and operates within a supply voltage range up to 10V. It is housed in a compact 5-SSOP (SC-74A) surface-mount package. The component supports a wide operating temperature range from -40°C to +75°C and complies with RoHS3 standards.

Feature Summary

• Provides automatic system reset functionality via a low-active output when monitored voltage drops below the threshold.
• Features an open-drain or open-collector output interface suitable for direct connection to digital logic inputs.
• Designed for low-power consumption with minimal static current draw during operation.

Applications

• Microprocessor and microcontroller power supply monitoring
• Battery-powered equipment voltage supervision
• Embedded system reset circuit generation

Procurement Notes

Verify the exact part number suffix and manufacturer lot codes upon receipt, as the BD4742G-TR is listed as discontinued. Confirm that the received components match the original datasheet specifications regarding package dimensions and pinout configuration. Check for any obsolescence notices or end-of-life notifications from Rohm Semiconductor before finalizing procurement plans.

Selection Notes

Select this component when a simple, low-cost voltage supervisor with a fixed 4.2V threshold is required. It is suitable for designs where manual reset is unnecessary and an open-drain output interface is preferred. Consider alternative parts if higher accuracy, adjustable thresholds, or watchdog timer functions are needed for the application.

Part Context

This component belongs to the BD47xx series of standard voltage detectors from Rohm Semiconductor. It shares similar architectural characteristics with other members of the family, such as the BD4737G-TR and BD4744G-TR, differing primarily in their specific detection threshold voltages. The series is designed for general-purpose electronic equipment requiring reliable power supervision.

Replacement Considerations

The BD5242G-1TR is identified as a similar replacement option with the same SSOP5 package. Verify compatibility regarding output type and threshold voltage before substitution.