L7809CV Voltage Regulator

Product Description

The L7809CV Voltage Regulator is a dependable linear positive voltage regulator designed to provide a fixed +9 V output with reliable, stable performance. Part of the widely used 78xx regulator family, the L7809CV is commonly employed in power supply circuits and electronic designs that require a steady 9 V DC power source.

Thanks to its simple implementation and built-in protective features, this regulator is ideal for a range of applications including microcontroller systems, analog circuits, sensor modules, and low-power devices. With minimal external components needed, the L7809CV offers an easy and cost-effective solution for voltage regulation tasks.

✨ Key Features

• Fixed +9 V output voltage

• High regulation accuracy for stable performance

• Up to 1 A output current (typical)

• Simple design with minimal external components required

• Overcurrent and short-circuit protection

• Thermal overload shutdown for reliable operation

• Standard TO-220 package for easy mounting

• Low noise output suitable for sensitive electronics

📐 Technical Specifications

Electrical Characteristics

• Model: L7809CV

• Output Voltage: +9 V (fixed)

• Output Current: Up to 1 A

• Input Voltage Requirement: Typically ≥ 11–12 V DC (must be higher than output + dropout voltage)

• Regulation Type: Linear

• Voltage Tolerance: ±4% (typical)

• Dropout Voltage: Approximately 2–3 V (headroom above output required)

• Quiescent Current: Low operating current

Protection Features

• Overcurrent/Short-Circuit Protection — prevents damage under excessive load

• Thermal Shutdown — safeguards against overheating

Physical Characteristics

• Package Type: TO-220 (through-hole mount)

• Mounting Style: Through-hole PCB installation

• Operating Temperature: −40 °C to +125 °C (typical)

• Storage Temperature Range: −65 °C to +150 °C

🧰 Typical Applications

• Regulated power supplies

• Microcontroller and embedded system power source

• Analog and digital circuit regulation

• Sensor and communication module power

• Robotics and automation projects

• Educational and hobby electronics

🛠️ How It Works (Overview)

1. Input Voltage: Apply an unregulated DC input voltage that is a few volts higher than the desired output.

2. Regulation: The L7809CV regulates the input down to a stable +9 V DC output.

3. Protection: Built-in current limiting and thermal shutdown help safeguard the regulator under stress.