Introduction
The LM7809 Voltage Regulator IC is a popular member of the 78XX series of fixed linear voltage regulators, designed to provide a stable +9V DC output. It is widely used in electronic circuits that require a regulated 9V supply for consistent performance. This IC is especially important for powering sensors, microcontrollers, analog circuits, audio devices, and communication modules where voltage stability is critical.
The LM7809 accepts an input voltage typically ranging from 11V to 35V and regulates it down to a precise +9V output. It can supply up to 1.5A of continuous output current when used with a proper heat sink. To ensure safety and long-term operation, the IC includes internal thermal shutdown, short-circuit protection, and safe operating area protection. This makes it a reliable choice for both beginner electronics projects and professional designs.
LM7809 Voltage Regulator IC
Available in standard packages like TO-220, TO-92, and TO-252, the LM7809 offers flexibility in different applications, from compact low-power circuits to higher current power supply units. With its low cost, wide availability, and ease of use, the LM7809 has become a standard component in regulated power supply circuits, embedded systems, robotics, consumer electronics, and audio equipment.
LM7809 Pinout
LM7809 Key Features
- Provides fixed +9V regulated output
- Maximum output current: up to 1.5A (with heat sink)
- Wide input voltage range: 11V to 35V
- Built-in thermal shutdown protection
- Internal current limiting
- Short-circuit protection
- Safe area compensation for reliability
- Easy to use, requires minimal external components
- Available in TO-220, TO-252, and TO-92 packages
LM7809 Specifications/Characteristics
- Output Voltage: +9V (fixed)
- Input Voltage Range: 11V – 35V
- Maximum Output Current: 1.5A
- Voltage Tolerance: ±2%
- Dropout Voltage: ~2V (depends on load current)
- Operating Temperature Range: 0°C to +125°C
- Power Dissipation: depends on package & heat sink
- Package Options: TO-220, TO-252, TO-92
Note: DATASHEET DOWNLOAD button is provided end of this article.
Pin Configuration of LM7809 Voltage Regulator IC
| Pin# | Pin Name | Pin Description |
|---|---|---|
| 1 | Input | Unregulated input voltage (11V–35V) |
| 2 | Ground | Common ground (GND) reference |
| 3 | Output | Provides regulated +9V output |
More Circuit Layouts
Key Applications of LM7809 Voltage Regulator IC
- Fixed +9V DC power supply design
- Embedded systems and robotics
- Microcontroller and sensor powering
- Audio amplifier and audio equipment circuits
- Industrial control systems
- Consumer electronics (radios, calculators, toys)
- Battery chargers and power adapters
- Communication devices requiring +9V regulation
LM7809 Equivalent ICs / Alternatives
- LM7805 (fixed +5V regulator)
- LM7806 (fixed +6V regulator)
- LM7812 (fixed +12V regulator)
- LM317 (adjustable regulator from 1.25V to 37V)
- L7809CV, KA7809, UA7809 (other manufacturer equivalents)
- AMS1117-9.0 (low-dropout +9V regulator alternative)
(The pinout for certain ICs can vary from that of the LM7809).
Datasheet of LM7809 Voltage Regulator IC
Click the following Button below to download the datasheet of LM7809 :
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