A72 STMicroelectronics LM317T Adjustable Voltage Regulator, 1.2V to 37V 1.5A, TO-220 Package

The LM317T by STMicroelectronics is a monolithic integrated circuit designed to provide a highly stable, adjustable output voltage. Unlike fixed regulators, the LM317T allows you to set the output voltage anywhere between 1.2V and 37V using just two external resistors. Housed in the industry-standard TO-220 package, it is capable of supplying more than 1.5A of load current.

Key Technical Specifications

• Function: Adjustable Positive Voltage Regulator

• Output Voltage Range: 1.2V to 37V

• Output Current: 1.5A (Minimum)

• Line Regulation: 0.01% / V (Typical)

• Load Regulation: 0.1% (Typical)

• Package Type: TO-220 (Through-hole)

• Protection Features: Internal thermal overload protection, short-circuit current limiting, and safe area compensation.

Applications

• Variable Power Supplies: Creating lab bench power supplies with adjustable outputs.

• On-Card Regulation: Distributed power systems where a specific voltage is needed locally on a PCB.

• Battery Chargers: Constant current/voltage charging circuits for various battery chemistries.

• LED Drivers: Configuring the regulator in constant current mode for high-power LEDs.

• Automotive Electronics: Regulating fluctuating vehicle battery voltages for sensitive electronics.

Why Choose the LM317T?

• Extreme Versatility: Replaces a wide range of fixed-voltage regulators in your inventory.

• Robust Protection: Virtually "blow-out proof" due to its built-in thermal and current limiting features.

• High Performance: Offers better line and load regulation than most standard fixed regulators.

• Ease of Use: Requires only two external resistors to set the voltage, making circuit design straightforward.

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