BD4738G-TR

Overview

The BD4738G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It operates within a supply voltage range of 1.9 V to 4.6 V and features a fixed threshold detection level at 3.8 V. The device utilizes an open-drain output configuration and is housed in a compact 5-pin SSOP (SC-74A/SOT-753) package suitable for surface-mount applications. Key electrical characteristics include a typical operating current of 550 nA and high accuracy with a reset delay time of 50 ms. It functions reliably across an extended temperature range from -40°C to +125°C, ensuring stable performance in various electronic systems.

Feature Summary

• Provides precise voltage supervision with a fixed 3.8 V detection threshold for reliable system monitoring
• Features low power consumption with ultra-low operating current suitable for battery-powered devices
• Delivers active-low open-drain output signals compatible with standard digital logic interfaces
• Ensures operational stability across wide industrial temperature ranges without requiring external components

Applications

• Portable electronic devices requiring efficient power management and low standby current
• Microprocessor and microcontroller systems needing reliable brown-out protection
• Battery-operated equipment where voltage levels must be monitored to prevent data loss
• Industrial control systems operating under varying environmental temperature conditions

Procurement Notes

Verify the specific datasheet revision and exact pinout configuration before integration, as package variants may exist within the same series. Confirm that the 3.8 V threshold aligns precisely with your target supply voltage requirements. Ensure compatibility with the open-drain output pull-up resistor values used in your circuit design. Check for any recent lifecycle status updates or recommended alternative part numbers from the manufacturer to ensure long-term supply availability.

Selection Notes

Select this component when a fixed 3.8 V threshold is required for single-supply monitoring applications. It is appropriate for designs prioritizing low quiescent current and compact footprint over adjustable threshold capabilities. Consider the open-drain output requirement if interfacing with different logic voltage levels. Evaluate the thermal performance within the specified -40°C to +125°C range against your specific environmental constraints.

Part Context

This part belongs to ROHM's line of CMOS voltage detectors, which are specialized supervisory circuits designed to monitor power rails. These devices typically offer high accuracy and low power consumption compared to older bipolar technologies. The BD4738G-TR specifically targets applications requiring a fixed detection voltage, distinguishing it from adjustable threshold variants in the broader product family.

Replacement Considerations

Consult official ROHM documentation for direct cross-references. Verify that any substitute maintains the 3.8 V threshold, 5-pin SSOP package, and open-drain output characteristics. Ensure the replacement supports the same operating voltage range and temperature specifications.