EmbeddedRelated.com
The 2026 Embedded Online Conference
    Parts    LM317T/NOPB
LM317T/NOPB

TILM317T/NOPB

Texas Instruments
Industry-standard adjustable regulator useful for lower-current designs or where a well-known, easy-to-source part is acceptable; lower current rating than the LT3083 but very common and inexpensive.
Active2,367 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LM317T/NOPB is a classic adjustable positive linear voltage regulator capable of supplying over 1.5A of output current. It is widely used for its simplicity, cost-effectiveness, and reliability in a broad range of general-purpose power supply applications. This through-hole component comes in a TO-220 package.

Why Choose This Part

Engineers choose the LM317T/NOPB for its widespread availability, low cost, and proven reliability. Its simple external component requirements make it easy to integrate into new and existing designs. The robust protection features, including short-circuit and thermal overload protection, enhance system durability.

Applications

Adjustable Power Supplies
Ideal for creating simple, low-cost variable voltage power supplies for lab use or prototyping, given its adjustable output and robust current capability of 1.5A.
Local On-Card Regulation
Suitable for regulating voltage directly on circuit boards to power specific sections, offering protection against over current, over temperature, and short circuits.
Battery Chargers
Can be configured as a basic constant-voltage or constant-current charger for various battery types, with an input voltage up to 37V.
High-Current Regulators
Serves as a series pass regulator for applications requiring output currents up to 1.5A, ensuring stable voltage delivery.
Current Limiters
Can be used in configurations to limit current for sensitive loads, leveraging its built-in short-circuit protection.

Key Specifications

PSRR 64dB (120Hz)
Output Type Adjustable
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 1.5A
Protection Features Over Current, Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature 0degC ~ 125degC
Voltage - Input (Max) 37V
Voltage - Output (Max) 37V
Supplier Device Package TO-220-3
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 1.25V

Getting Started

To get started with the LM317T/NOPB, basic analog circuit design knowledge is sufficient. A typical application requires only two external resistors to set the output voltage and input/output capacitors for stability. No specific development kits or IDEs are needed; standard breadboarding or PCB prototyping techniques apply.

The 2026 Embedded Online Conference