LM317 Adjustable Voltage Regulator TO-252

LM317 Adjustable Voltage Regulator in TO-252 package is a versatile and widely used three-terminal regulator that allows output voltage adjustment from 1.25V to 37V with output current up to 1.5A. This surface-mount version is ideal for compact power regulation applications where space and heat management are critical.

Key Features of LM317 Adjustable Voltage Regulator TO-252:

• Adjustable Output Voltage: Range from 1.25V to 37V with external resistor setup.
• High Output Current: Capable of supplying more than 1.5A load current.
• Thermal Overload Protection: Internal circuitry protects against overheating.
• Short Circuit Protection: Safeguards against excessive current draw or output shorting.
• TO-252 Package: Compact surface-mount package suitable for tight PCB layouts.

Technical Specifications of LM317 Adjustable Voltage Regulator TO-252:

• Output Voltage Range: 1.25V to 37V (adjustable)
• Output Current: 1.5A (typical)
• Input Voltage: Up to 40V
• Line Regulation: 0.01%/V (typ)
• Load Regulation: 0.1% (typ)
• Temperature Range: 0°C to +125°C

Mechanical Specifications of LM317 Adjustable Voltage Regulator TO-252:

• Package Type: TO-252 (DPAK)
• Mounting Type: Surface Mount (SMD)
• Pin Count: 3 Pins (Adjust, Output, Input)
• Cooling: Requires heat dissipation via PCB pad or external heatsink if heavily loaded

Dimensions:

• Package Width: 6.6mm
• Package Length: 10.3mm
• Height: 2.5mm (approx)
• Lead Pitch: 2.3mm

Mounting Options:

• SMD Mount: Designed for reflow soldering on PCBs.
• Heatsink Compatible: Thermal pad can be soldered to large copper areas for heat dissipation.

Schematic Diagram, Connection, Wiring and Pinout of LM317 TO-252:

• Pin 1 (Adjust): Used with resistors to set output voltage.
• Pin 2 (Output): Regulated output voltage.
• Pin 3 (Input): Unregulated input voltage.
• Connection Notes: Use capacitors at input/output for stability. Set voltage using two external resistors (R1 and R2).

Datasheet of LM317 Adjustable Voltage Regulator TO-252:

• Download LM317 Datasheet (PDF)

Applications of LM317 Adjustable Voltage Regulator TO-252:

• Power Supplies: Adjustable linear power supplies for electronics.
• Battery Chargers: Custom charging circuits with regulated voltage.
• Bench Power Tools: Regulated output for hobby electronics or test setups.
• Motor Controllers: Voltage regulation for low-power DC motors.
• DIY Electronics: Widely used in Arduino, Raspberry Pi and robotics projects.

Equivalent of LM317 Adjustable Voltage Regulator TO-252:

• AMS1117 Adjustable: Low current SMD adjustable regulator
• LD1117 Adjustable: Drop-in replacement with low dropout voltage
• LM1085 Adjustable: High current version of LM317
• TL317: Functional equivalent with similar pinout and specs

Package Includes:

• 1 x LM317 Adjustable Voltage Regulator TO-252