LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable
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LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable

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  • Product SKU: KG320
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The LM317 is a versatile voltage regulator integrated circuit (IC) that can be used to provide a stable and adjustable output voltage from a higher input voltage source. It's commonly used in electronic circuits where a precise and adjustable power supply is required.

Here are the key features and details of the LM317 DC Linear Regulator:

Input Voltage Range: The LM317 can accept an input voltage in the range of 4.5V to 40V. This means it can work with a wide variety of power sources.

Output Voltage Range: It can provide an adjustable output voltage ranging from 1.2V to 37V. This makes it suitable for a wide range of applications where specific voltages are required.

Linear Regulator: The LM317 is a linear regulator, which means it regulates the output voltage by dissipating excess energy as heat. This can make it less efficient compared to switching regulators but it's simple to use.

Adjustable Output: The output voltage can be set by using two external resistors connected to the adjust (ADJ) and output (OUT) pins of the LM317. This allows for fine-tuning of the output voltage.

Current Limiting: The LM317 has internal current limiting and thermal shutdown features to protect itself and the connected components from overcurrent and overheating conditions.

TO-220 Package: The LM317 is often available in a TO-220 package, which is a common through-hole package that can be easily mounted on a PCB (Printed Circuit Board) or used with a heatsink if required.

Applications of the LM317 DC Linear Regulator:

Power Supplies: It's commonly used to build adjustable power supplies for various electronic devices and circuits.

Battery Chargers: The LM317 can be used to regulate the charging voltage for rechargeable batteries.

Voltage References: It's used in precision circuits where a stable reference voltage is required.

Audio Amplifiers: In audio amplifiers, the LM317 can be used to provide a stable and adjustable bias voltage.

Lab Experiments and Prototyping: It's a popular choice in labs and during prototyping to provide a variable power supply for testing and experimenting with electronic circuits.

Technical Details

  • Output Current: 1.5A (minimum), 2.2A 
  • Input and output voltage difference (VI-VO): 40Vdc (max)
  • Support: Windows 98 to Windows 7 (32-bit and 64-bit) Mac OS 8 to OS X (32-bit and 64-bit) Linux
  • Operating temperature: -55 to +150
  • Output Current: 1.5A
  • Input voltage: 4.2 ~ 40 V


  • Output Current: 1.5A (Min.), 2.2A (Typical)
  • Input-Output Voltage Differential (VI-VO): 40Vdc (Max.)
  • Voltage Input: 4.2~40V
  • Adjustable Output Voltage Range: 1.2~37V
  • Operating Temperature: 0~125 ℃
  • Current Output: 1.5A
  • Characteristic Frequency: 100MHz
  • Input Method: VIN Input Positive Level, GND Input Negative
  • Output Method: VOUT Output Positive Level, GND Output Negative

Physical Attributes

  • L x W x H (mm): 30 x 20 x 20
  • Weight (gm): 5

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    Package Includes

    • 1 x LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable

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