BD4939FVE-TR

Overview

The BD4939FVE-TR is a standard CMOS voltage detector IC from ROHM Semiconductor, designed for precise power supply monitoring. It features a detection threshold of 3.9V with an accuracy of ±1%. The device operates within a supply voltage range of 0.95V to 10V and includes a fixed reset delay timer of 100µs. It utilizes a VSOF-5 package and supports an operating temperature range from -40°C to +105°C.

Feature Summary

• CMOS output structure for low current consumption
• High precision voltage detection capability
• Integrated reset delay timer function

Applications

• Portable equipment power management
• Microprocessor system supervision
• Battery-powered device monitoring

Procurement Notes

Verify the specific suffix FVE indicates the VSOF-5 package configuration. Confirm the detection voltage corresponds to the 3.9V threshold variant. Check RoHS compliance status as per the latest datasheet revision. Ensure the ordering part number matches the required tape and reel quantity specifications for production integration.

Selection Notes

Select this component when a fixed 3.9V detection threshold is required for single-input monitoring. The CMOS output type suits applications needing push-pull drive characteristics. Consider the 100µs reset delay for noise immunity requirements. Verify that the VSOF-5 package dimensions fit the PCB layout constraints compared to alternative SSOP packages.

Part Context

This part belongs to the BD49xxx series of high-accuracy, low-current voltage detectors. The series offers various detection voltages in 0.1V increments ranging from 2.3V to 6.0V. The BD4939 specifically targets the 3.9V threshold application within this family, providing a standardized solution for mid-range voltage supervision tasks.

Replacement Considerations

BD5239G-1 is listed as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package instead of VSOF-5, requiring mechanical adaptation.