LM317 Linear Voltage Regulator IC 1.2V–37V 1.5A (TO-220 Package) for Arduino, DIY Power Supply, and Bench Circuits

Build rock-solid, custom power supplies with the industry-standard LM317 Adjustable Voltage Regulator IC in a TO-220 package. Capable of supplying over 1.5 A of load current across an adjustable output range of 1.2 V to 37 V, this linear regulator is the premier choice for electronics hobbyists, repair engineers, and DIY circuit designers.

Requiring only two external resistors to set the output voltage, the LM317 offers superior line and load regulation compared to standard fixed regulators. Built-in internal thermal overload protection, short-circuit current limiting, and safe-area compensation make it virtually blowout-proof against accidental overloads on your test bench.

Key Features

• Wide Adjustable Output: Easily adjust DC output voltage anywhere from 1.2V to 37V using a basic potentiometer or fixed resistor divider.

• High Output Capability: Delivers up to 1.5 A continuous output current when mounted to an appropriate heat sink.

• Complete Internal Protection: Built-in thermal shutoff, current limit, and safe operating area protection prevent IC failure under overload conditions.

• Exceptional Ripple Rejection: Provides 80 dB ripple rejection, making it ideal for low-noise audio preamps, lab power supplies, and sensitive instrumentation.

• Standard TO-220 Package: Easy to breadboard, solder to prototype PCB boards, and mount to standard heatsinks via its integrated mounting hole.

Technical Specifications

Common Applications

• Variable benchtop DIY power supplies and battery chargers

• Microcontroller power regulation (Arduino, Raspberry Pi, ESP32 prototypes)

• Constant-current LED driver circuits

• Low-noise preamplifiers and audio circuitry

Package Includes

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