The R1161N281D-TR is a low-dropout (LDO) voltage regulator manufactured by Ricoh. It's designed to deliver a stable and accurate output voltage, even when the input voltage is close to the desired output voltage. This characteristic is particularly beneficial in battery-powered devices where the battery voltage gradually decreases during use.

Applications:

• Power Management in Portable Devices: Ideal for smartphones, tablets, and other battery-operated electronics.
• Voltage Regulation for Microcontrollers: Provides a clean and stable power supply for reliable microcontroller operation.
• Post-Regulation for Switching Power Supplies: Improves the output voltage accuracy and reduces noise and ripple.
• Sensor Power Supplies: Provides a stable voltage source for sensitive sensors, ensuring accurate measurements.

Features:

• Low Dropout Voltage: Ensures a stable output voltage even with a small difference between input and output voltage.
• High Output Voltage Accuracy: Provides a precise and consistent output voltage for sensitive circuits.
• Overcurrent Protection: Protects the regulator and the load from damage due to excessive current draw.
• Thermal Shutdown Protection: Prevents the regulator from overheating and potentially failing due to excessive power dissipation.
• Small Package Size: Allows for compact designs and space-saving applications.

Benefits:

• Extended Battery Life: The low dropout voltage and high efficiency contribute to longer battery life in portable devices.
• Improved System Reliability: The overcurrent and thermal shutdown protections enhance the overall reliability of the system.
• Stable Performance: The high output voltage accuracy ensures stable performance of the powered circuits.
• Reduced Board Space: The small package size enables more compact and efficient designs.

The '281' in the part number usually indicates an output voltage of 2.8V. The R1161 series typically offers various output voltage options and package types to accommodate different application requirements. It is crucial to consult the official Ricoh datasheet for the R1161N281D-TR to obtain definitive specifications, including the input voltage range, output current capabilities, dropout voltage characteristics under different load conditions, quiescent current, and thermal resistance. The datasheet will also provide guidance on recommended external components, such as input and output capacitors, to ensure stability and optimal performance. The -TR suffix generally signifies tape and reel packaging, suitable for automated assembly lines.