LM317T voltage regulator

The LM317T voltage regulator is an adjustable positive linear regulator in a TO-220 package. With just two resistors you can set any output from 1.25 V to 37 V, and it can supply up to 1.5 A with a suitable heatsink. Built-in current limiting and thermal shutdown make it a robust choice for adjustable power supplies and lab projects.

LM317T voltage regulator Specifications

• Output voltage: adjustable, 1.25 V to 37 V
• Output current: up to 1.5 A
• Reference voltage: 1.25 V between OUT and ADJ
• Input-output difference: 3 V to 40 V
• Protection: current limiting, thermal shutdown, safe-area protection
• Package: TO-220, pins ADJ, OUT, IN (tab connected to OUT)

LM317T voltage regulator Applications

• Adjustable bench power supplies
• Constant-current LED drivers and battery chargers
• Generating non-standard voltages such as 3.3 V, 9 V or 13.8 V
• Electronics labs and university projects

What's in the Box

• 1 × LM317T adjustable voltage regulator

Tip: Set the output with Vout = 1.25 V × (1 + R2 / R1); with R1 = 240 Ω, R2 = 720 Ω gives about 5 V. Add 0.1 µF at the input and 1 µF at the output, and use a heatsink when the voltage drop and current are high.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.