BD4739G-TR

Overview

The BD4739G-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel input voltages. It features a fixed threshold detection voltage of 3.9 V with a precision of ±1%. The device utilizes an open collector output type and operates within a supply voltage range up to 10 V. It supports manual reset functionality and lacks a watchdog timer or battery backup switch. The component is housed in an SSOP-5 package and is rated for operation between -40°C and +75°C.

Feature Summary

• Provides precise under-voltage detection with a fixed 3.9 V threshold
• Features open collector output for flexible interface integration
• Supports manual reset control for system initialization management

Applications

• Microprocessor reset circuit generation
• Battery voltage monitoring systems
• Power supply supervision in embedded devices

Procurement Notes

Verify the current lifecycle status as the component may be subject to discontinuation or last-time-buy restrictions. Confirm that the SSOP-5 package dimensions align with the target PCB footprint. Ensure the open collector output configuration matches the downstream logic requirements without additional pull-up components if necessary.

Selection Notes

Select this component when a fixed 3.9 V detection threshold is required for system supervision. The open collector output necessitates consideration of external pull-up resistors. Verify that the operating temperature range of -40°C to +75°C meets the environmental constraints of the application. Compare against CMOS output variants if active high signals are preferred.

Part Context

This part belongs to the BD47 series of standard voltage detectors from ROHM Semiconductor. These devices are engineered for low-power applications requiring reliable voltage supervision. The series offers various threshold options to accommodate different logic families and power rails.

Replacement Considerations

BD5239G-1 is listed as a recommended replacement with the same SSOP-5 package. Note differences in output type (open drain vs. open collector) and delay timer adjustability.