The BU4938FVE-TR is a voltage detector IC manufactured by Rohm Semiconductor. It functions as a voltage supervisor, monitoring the input voltage and issuing a reset signal when the voltage drops below a predefined threshold. This protects microcontrollers and other digital circuits from malfunctioning or corrupting data due to insufficient voltage supply.

Applications:

• Microcontroller reset circuits
• CPU reset circuits
• Power supply voltage monitoring
• Battery-powered devices
• Industrial control equipment
• Consumer electronics

Features:

• Detection Voltage: 3.8V (Specific voltage, always check the datasheet to confirm precise value.)
• High Accuracy Detection: Ensures reliable and precise voltage monitoring.
• Low Current Consumption: Minimizes power drain, making it suitable for battery-powered applications.
• Small Package: Available in a compact package, typically a VSON package, which is very small.
• Open Drain Output: Requires an external pull-up resistor for the output.
• Hysteresis: Built-in hysteresis prevents oscillation near the threshold voltage.
• Operating Temperature Range: Typically -40°C to +85°C.

Benefits:

• Prevents Malfunctions: Protects sensitive components from damage caused by undervoltage conditions.
• Ensures Data Integrity: Avoids data corruption resulting from voltage fluctuations.
• Reliable Reset: Provides a clean and reliable reset signal for system initialization.
• Extended Battery Life: Low power consumption contributes to longer run times in portable devices.
• Space-Saving Design: The small package allows for integration into compact electronic devices.

Additional Details:

The BU4938FVE-TR features an open drain output configuration, necessitating an external pull-up resistor for proper operation. The "-TR" suffix typically indicates tape and reel packaging for automated assembly. Consult the Rohm Semiconductor datasheet for precise specifications, including electrical characteristics, timing diagrams, and recommended PCB layout patterns. The datasheet will also detail the recommended value for the external pull-up resistor. Always verify the exact detection voltage required for the specific application and cross-reference that with the datasheet for the correct part number variation. The VSON package offers excellent thermal performance due to its exposed pad.