LM317 Adjustable Voltage Regulator IC | 1.25V–37V Output | Ideal for Custom Power Supplies

LM317 Adjustable Voltage Regulator IC | 1.25V–37V Output | Ideal for Custom Power Supplies

The LM317 is a widely used adjustable 3-terminal positive voltage regulator IC designed to provide a stable, user-defined output voltage from 1.25V up to 37V, with a current output of up to 1.5A (with adequate heat dissipation).

It is an essential component for DIY power supply circuits, Arduino projects, lab bench regulators, and variable voltage control systems. The output voltage is set using just two external resistors, allowing you to precisely tune the voltage according to your needs.

Its built-in current limiting, thermal shutdown, and safe area protection make it a reliable and robust choice for both beginners and professionals.

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✅ Key Features:

• 📦 Package: TO-220 (3-pin)

• ⚡ Adjustable Output Voltage: 1.25V to 37V

• 🔌 Input Voltage Range: Typically 3V above output, up to 40V

• 🔋 Output Current: Up to 1.5A (with heatsink)

• 🔥 Built-in Protections: Overload, thermal, short-circuit

• ⚙️ Voltage Setting: Requires two external resistors

• 🧊 Heatsink Compatible: For continuous high current output

• 🧪 PCB & Breadboard Friendly

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🔧 Applications:

• DIY variable power supplies

• Adjustable battery chargers

• Powering LED strips, sensors, or motors with custom voltages

• Learning projects for electronics students

• Bench test equipment for electronics labs

• Regulated power for Arduino, Raspberry Pi, or other microcontroller projects

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📦 Package Includes:

• 1 x LM317 Adjustable Voltage Regulator IC (TO-220 Package)

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🛠️ Usage Tips:

• Use a heatsink when drawing current above 500mA

• Add input and output capacitors (0.1µF–1µF) for stability

• Use a voltage divider (two resistors) or a variable resistor (potentiometer) to set output voltage

• Ensure input voltage is at least 3V higher than desired output

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🔍 Keywords

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