The UTC78D09AL-TN3-TR is a three-terminal positive voltage regulator providing a fixed +9V output voltage. The 'AL' suffix likely indicates specific features such as low quiescent current or a different package type compared to standard 7809 series regulators. Manufactured by UTC (Unisonic Technologies Co., Ltd.), it is designed for applications needing a stable 9V supply, especially in low-power or space-constrained scenarios.

Applications

• Microcontroller Power Supply: Regulating voltage for microcontrollers requiring a 9V supply in low-power applications.
• Sensor Power Supply: Providing stable 9V for sensors and transducers.
• Battery-Powered Devices: Efficient voltage regulation in battery-operated devices.
• Low-Power Linear Regulation: Suitable for low-power linear regulation circuits.
• Portable Equipment: Power management in portable electronic devices.

Features

• Fixed 9V Output: Provides a stable and accurate 9V output voltage.
• Low Quiescent Current: Minimizes power consumption, making it suitable for battery-powered applications.
• Internal Thermal Overload Protection: Protects the regulator from overheating.
• Short Circuit Current Limiting: Protects the regulator from short circuit conditions.
• Low Dropout Voltage: Allows operation with a small difference between input and output voltage for increased efficiency.

Benefits

• Extended Battery Life: Low quiescent current contributes to longer battery life.
• Stable Power Supply: Ensures reliable 9V supply for sensitive electronic components.
• Simplified Circuit Design: Requires minimal external components.
• Overload Protection: Prevents damage to the regulator and connected devices.
• Improved Efficiency: Low dropout voltage enhances efficiency, especially in battery-powered applications.

Additional Details

The UTC78D09AL-TN3-TR likely operates with an input voltage slightly higher than 9V. Heat sinking requirements depend on the load current and input voltage. The 'TN3' and 'TR' suffixes likely refer to the package type (e.g., SOT-89 or similar) and packaging method (e.g., Tape and Reel) respectively. The datasheet provides detailed electrical characteristics, thermal specifications, and application examples. The 'AL' likely denotes an improved or low-power version.