L7809 (Positive Voltage Regulator (9V - 1A)

Overview

The L7809 is a fixed positive voltage regulator that delivers a stable 9V output with a maximum current of 1A. This three-terminal regulator is a staple in electronics, providing reliable power for a wide range of projects. Whether you are powering a microcontroller, sensor module, or a small motor driver, the L7809 ensures that your components receive consistent voltage, protecting them from fluctuations that can cause erratic behavior or damage. Its simple TO-220 package is easy to mount on a heatsink for higher current applications, making it a versatile choice for both hobbyists and professionals.

Key Features

• Fixed 9V output, 1A current capacity
• Built-in thermal overload protection
• Short-circuit protection
• Safe operating area protection
• Low quiescent current
• Output voltage tolerance of ±4%
• TO-220 package for easy heatsinking

Technical Specifications

• Output Voltage: 9V (typical)
• Output Current: up to 1A
• Input Voltage Range: 11.5V to 35V
• Dropout Voltage: 2V (typical)
• Line Regulation: 100mV (typical)
• Load Regulation: 100mV (typical)
• Operating Temperature Range: -40°C to +125°C
• Package: TO-220

Applications & Use Cases

• Powering 9V-rated microcontrollers and sensors
• Voltage regulation for Arduino and Raspberry Pi projects
• Powering analog circuits that require a clean 9V supply
• Reducing higher DC voltages from batteries or adapters
• Building custom power supplies for robotics and automation

What's Included

• 1x L7809 Positive Voltage Regulator

Compatibility

• Works with any DC power source within the input voltage range
• Compatible with standard breadboards and PCBs
• Use with appropriate input and output capacitors for best performance (typically 0.33µF input, 0.1µF output)

MOKWN Recommendation

For most projects, the L7809 is an excellent choice when you need a reliable 9V supply. Pair it with a heatsink if your load draws more than 500mA to ensure optimal thermal performance. If you require a different voltage, check out our other L78xx series regulators.