BD4946FVE-TR

Overview

The BD4946FVE-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-channel power supply voltages. It features a CMOS output with a typical under-voltage detection threshold of 4.6V and a precision of ±1%. The device operates within a reset active voltage range of 0.95V to 10V and supports a maximum supply voltage of 10V. It is housed in a VSOF5 package (1.6x1.6mm) and functions across an industrial temperature range of -40°C to 105°C. The component draws a circuit current of 0.60μA at 4.8V and includes hysteresis defined as VDET x 0.05.

Feature Summary

• CMOS output structure providing low-level sink current capability
• High accuracy voltage detection with specified hysteresis to prevent output fluctuation
• Compact surface-mount packaging suitable for space-constrained designs

Applications

• Monitoring main power rails in embedded systems
• Supervising battery voltage levels in portable devices
• Providing reset signals for microcontrollers during power-up sequences

Procurement Notes

Verify the specific suffix FVE against the target design requirements, as it denotes the VSOF5 package type. Confirm that the 4.6V threshold aligns with the system's minimum operating voltage. Check for end-of-life status or last-time buy notices, as this component may be discontinued. Ensure the CMOS output drive strength meets the load requirements of the connected logic inputs without external pull-ups.

Selection Notes

Select this component when a fixed 4.6V threshold is required for single-supply monitoring. The VSOF5 package offers a smaller footprint compared to SSOP alternatives like the BU4946G series. Consider the CMOS push-pull output if driving loads directly, noting the limited low-state current compared to open-drain variants. Verify thermal performance within the 105°C limit for high-temperature environments.

Part Context

This part belongs to the BD49xx series of standard voltage detectors from ROHM Semiconductor. It is functionally related to the BU4946 series but utilizes a different package and potentially different internal characteristics. The BD4946FVE-TR serves as a dedicated supervisor IC for maintaining system stability by detecting undervoltage conditions.

Replacement Considerations

BD5246G-1TR is listed as a recommended replacement with similar specifications, though it features an open-drain output and SSOP5 package.