LM317 Adjustable Voltage Regulator TO-92

LM317 Adjustable Voltage Regulator TO-92 is a versatile linear regulator capable of delivering a stable output voltage adjustable from 1.25V to 37V with a maximum load current of 100mA. Packaged in a compact TO-92 form factor, it is ideal for low-power and space-constrained applications like battery chargers, embedded circuits, and adjustable power supplies.

Key Features of LM317 Adjustable Voltage Regulator TO-92:

• Adjustable Output Voltage: Can be set from 1.25V to 37V using external resistor divider.
• Current Limiting: Provides internal current limiting for overload protection.
• Thermal Overload Protection: Automatically shuts down in case of overheating.
• Safe Area Compensation: Prevents device damage under extreme conditions.
• Compact TO-92 Package: Ideal for space-saving designs.

Technical Specifications of LM317 Adjustable Voltage Regulator TO-92:

• Output Voltage Range: 1.25V to 37V (adjustable)
• Maximum Output Current: 100mA (TO-92 package)
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.1% (typical)
• Input Voltage Range: Up to 40V
• Reference Voltage: 1.25V
• Thermal Shutdown: Yes

Mechanical Specifications of LM317 Adjustable Voltage Regulator TO-92:

• Package Type: TO-92 (through-hole)
• Leads: 3-pin straight leads for PCB insertion
• Marking Code: LM317L

Dimensions:

• Body Width: 4.6 mm
• Body Height: 5.2 mm
• Pin Pitch: 1.27 mm
• Lead Length: 14 mm

Mounting Options:

• Through-Hole Mount: Compatible with standard PCB layouts.
• Breadboard Friendly: Fits standard breadboards for prototyping.

Schematic Diagram, Connection, Wiring and Pinout of LM317 TO-92:

• Pin 1 (Adjust): Connected to a resistor voltage divider for output adjustment.
• Pin 2 (Output): Regulated output voltage.
• Pin 3 (Input): Unregulated input voltage (max 40V).
• Wiring: Requires two resistors to set output voltage; optional capacitor for stability.

Datasheet of LM317 Adjustable Voltage Regulator TO-92:

• Download LM317 Datasheet (PDF)

Applications of LM317 Adjustable Voltage Regulator TO-92:

• Adjustable Power Supplies: Used in labs and DIY electronics projects.
• Battery Chargers: Provides controlled charging voltage.
• Post-Regulation for Switching Supplies: Smoothens the output voltage.
• Current Regulation: Used in constant current LED drivers.
• Embedded Circuit Power Supply: Custom voltage source for sensors and ICs.

Equivalent of LM317 Adjustable Voltage Regulator TO-92:

• AMS1117: SMD adjustable regulator with 1A current capacity
• LM317T: TO-220 version of LM317 with 1.5A current
• LT1086: Low-dropout adjustable regulator with 1.5A capacity

Package Includes:

• 1 x LM317 Adjustable Voltage Regulator TO-92