The R3112Q421A-TR-FE is a voltage detector (also known as a voltage supervisor or reset IC) manufactured by Nisshinbo Micro Devices Inc. It is designed to monitor a power supply voltage and provide a reset signal to a microcontroller or other digital circuit when the voltage falls below a certain threshold. This helps to prevent data corruption or system malfunction during power-up, power-down, or brownout conditions.

Applications

• Microcontroller-based systems: Providing a reliable reset signal to ensure proper microcontroller operation.
• Embedded systems: Monitoring the power supply voltage and initiating a reset if it falls below the threshold.
• Power management circuits: Supervising the output voltage of power regulators and DC-DC converters.
• Battery-powered devices: Detecting low battery conditions and initiating a controlled shutdown.
• Industrial control systems: Ensuring safe and reliable operation of industrial equipment.

Features

• Precise detection voltage: The detection voltage is typically 4.2V. The '42' in the part number indicates the nominal detection voltage.
• Low supply current: Consumes minimal power during operation.
• Open-drain output: The reset output is an open-drain NMOS transistor.
• Small package size: Available in a compact package, such as SOT-23 or similar.
• Hysteresis: Includes hysteresis to prevent oscillation near the threshold voltage.

Benefits

• Reliable reset function: Ensures proper system initialization and prevents data corruption.
• Low power consumption: Extends battery life in portable applications.
• Simple to use: Requires minimal external components.
• Small size: Enables integration into compact devices.

Additional Details

The R3112Q421A-TR-FE operates from a supply voltage range typically up to 5.5V. The operating temperature range is typically -40°C to +85°C. The "-TR" suffix indicates that the device is tape and reel packaged. The "-FE" indicates it is lead free. The open-drain output requires a pull-up resistor to a positive voltage supply. The reset signal is typically active low, meaning it is low when the voltage is below the threshold and high when the voltage is above the threshold.