The 78Lxx series are linear voltage regulators designed to provide a stable, fixed output voltage from a higher input voltage. These regulators are widely used in low-power applications, offering simple, reliable, and cost-effective voltage regulation. Housed in a compact TO-92 package, they are well-suited for small devices and systems.
The 78Lxx series is known for its ability to maintain a stable output voltage under varying load conditions, providing low ripple and noise. These regulators also feature built-in thermal overload protection and short-circuit protection, ensuring safe and efficient operation in a wide range of applications.
IC Symbol:
IC Pin Configuration:
IC Part Code:
Pin 1 – Input (Vin):
This is the input pin where the unregulated DC voltage is supplied. The input voltage must be higher than the output voltage by at least the dropout voltage for proper regulation.
Pin 2 – Ground (GND):
This pin is connected to ground (0V). It serves as the reference point for the regulator.
Pin 3 – Output (Vout):
The regulated output voltage is provided from this pin. It is the stable, fixed voltage that powers the load.
Features:
- Simple to Use
- Compact Size
- Cost-Effective
- Stable Output
- Built-in Protection
- Reliable Performance
- Easy Integration
- Wide Input Voltage Range
- Versatile
- Low Power Consumption
Applications:
- Power Supply Circuits - Provides regulated voltage for electronic devices
- Microcontroller & Embedded Systems - Powers Arduino, Raspberry Pi, and other MCUs
- Battery-Powered Devices - Ensures stable voltage for portable electronics
- Sensor Circuits - Supplies consistent voltage to sensors for accurate readings
- Communication Devices - Used in RF modules, Wi-Fi, and Bluetooth circuits
- Automotive Electronics - Voltage regulation in car chargers, dashboards, and ECUs
- Industrial Control Systems - Provides stable power to control units
- LED Drivers & Displays - Regulates voltage for LED indicators and displays
- Audio Circuits - Used in amplifiers and signal processing units
- DIY & Hobby Projects - Commonly used in prototyping and small electronic projects