The R3111N451A-TR is a voltage detector IC from Ricoh Electronic Devices Co., Ltd. It is designed to monitor voltage levels in electronic circuits and provide a reset signal when the voltage drops below a certain threshold. This IC is commonly used in applications requiring reliable voltage supervision and reset functionality.

Applications

• Microprocessor and Microcontroller Reset: Ensuring proper reset during power-up or brown-out conditions.
• Battery Monitoring: Preventing deep discharge of batteries in portable devices.
• Power Management Systems: Implementing undervoltage lockout (UVLO) functionality.
• Industrial Control: Monitoring power supply voltages in industrial equipment.
• Automotive Electronics: Providing voltage supervision in automotive systems.

Features

• High-Precision Detection Voltage: Provides accurate voltage monitoring.
• Low Supply Current: Minimizes power consumption in battery-powered applications.
• Built-in Hysteresis: Prevents oscillation and false triggering due to voltage noise.
• Small Package: Available in compact SOT-23-5 package.
• Open Drain Output: Offers flexibility in interfacing with external circuits.

Benefits

• Improved System Reliability: Prevents system malfunction by resetting the system during voltage drops.
• Extended Battery Life: Low current consumption extends operating time in battery-powered devices.
• Simplified Circuit Design: Integrated features reduce the need for external components.
• Reduced Board Space: Compact package allows for smaller and more densely populated circuit boards.
• Stable Operation: Hysteresis ensures reliable reset operation even in noisy environments.

Additional Details

The R3111N451A-TR features a detection voltage of 4.5V. It operates over a wide temperature range, typically -40°C to +85°C. The output is an N-channel open drain, requiring an external pull-up resistor. The typical supply current is very low, usually in the microampere range. The hysteresis voltage helps prevent oscillations and ensures reliable reset operation. Applications should carefully consider the pull-up resistor value and the specific voltage requirements to ensure proper function.