The RC78L09UA is a three-terminal positive regulator from NJR Corporation/NJRC, part of the RC78L series. It is designed to provide a stable and regulated 9V output voltage with a low dropout voltage. This regulator is commonly used in a variety of electronic circuits where a stable 9V power supply is required. Its compact size and ease of use make it suitable for many applications.

Applications

• Small Electronic Devices: Powering small electronic projects such as DIY electronics, hobby circuits, and educational kits.
• Microcontroller Power Supplies: Providing a stable 9V supply for microcontrollers and related components.
• Sensor Power Supplies: Used to provide regulated power to sensors, ensuring accurate and reliable readings.
• Battery-Powered Equipment: Employed in battery-powered devices to maintain a consistent voltage level as the battery discharges.
• General Purpose Regulation: Suitable for any application that requires a regulated 9V power supply.

Features

• Fixed Output Voltage: Provides a fixed 9V output voltage.
• Low Dropout Voltage: Operates with a low difference between input and output voltage.
• Output Current: Delivers up to 100mA of output current.
• Short-Circuit Protection: Protects the regulator from damage due to output shorts.
• Thermal Overload Protection: Shuts down the regulator when the junction temperature exceeds a safe limit.
• Small Package: Available in a compact package for space-constrained applications.

Benefits

• Stable Output: Provides a consistent and reliable 9V output voltage, ensuring stable operation of connected circuits.
• Simplified Design: Requires minimal external components, simplifying circuit design and reducing board space.
• Protection Features: Short-circuit and thermal overload protection enhance the reliability and longevity of the regulator and connected devices.
• Cost-Effective: Offers a low-cost solution for voltage regulation in various applications.
• Easy to Use: Simple three-terminal configuration makes it easy to integrate into existing circuits.

Additional Details

The RC78L09UA typically comes in a TO-92 package. The input voltage should be higher than the output voltage by at least the dropout voltage, which is typically around 2V. Basic application circuits usually include input and output capacitors to improve stability and transient response. The regulator's datasheet provides detailed specifications, application notes, and thermal considerations for optimal performance. This regulator is a dependable and efficient choice for providing a stable 9V supply in numerous electronic applications.