BD4940FVE-TR

Overview

The BD4940FVE-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel supply voltages. It features a typical under-voltage detection threshold of 4.0 V with a precision of ±1%. The device operates within a reset active voltage range of 0.95 to 10 V and utilizes a CMOS output type. It does not include manual reset, watchdog timer, or adjustable delay timer functions. The circuit current is specified at 0.60 μA (ON) and 0.85 μA (OFF) at VS=4.8V. Hysteresis is defined as VDET x 0.05. It is housed in a VSOF5 package and supports an operating temperature range from -40°C to +105°C.

Feature Summary

• CMOS output interface for digital logic compatibility
• Fixed hysteresis voltage proportional to detection threshold
• Low power consumption suitable for battery-operated systems

Applications

• Power supply monitoring in portable electronic devices
• Voltage supervision for microcontroller reset circuits
• Battery management system over-discharge protection

Procurement Notes

Verify the exact suffix and packaging configuration against the official datasheet before ordering. Confirm that the VSOF5 package dimensions match your PCB footprint requirements. Check for any specific RoHS compliance documentation if required by your manufacturing standards. Ensure the operating temperature range meets your application's environmental conditions. Validate the input voltage range against your system's maximum supply levels.

Selection Notes

Select this component when a fixed 4.0 V detection threshold is required without additional features like watchdog timers or manual resets. Compare the CMOS output drive capability against load requirements. Consider the low standby current for energy-efficient designs. Verify that the hysteresis level provides sufficient noise immunity for your specific signal environment. Ensure the VSOF5 package is compatible with your assembly process.

Part Context

This part belongs to the BD49 series of standard voltage detectors from ROHM Semiconductor. These devices are designed for simple, cost-effective voltage supervision applications. The series typically offers various detection thresholds to accommodate different supply rails. The VSOF5 package provides a compact solution for space-constrained designs. This specific model focuses on basic under-voltage detection functionality.

Replacement Considerations

BD5240G-1 is listed as a similar specification replacement with comparable detection voltage and package options.