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LDO Regulator Pos 1.5A 3-Pin(3+Tab) TO-220


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  • Part Number : LT317AT

  • Package/Case : TO-220-3

  • Brands : ADI

  • Components Categories : Voltage Regulators & Voltage ControllersLinear Voltage Regulators

  • Datesheet : LT317AT DataSheet (PDF)

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Overview of LT317AT

The LT317AT is a versatile adjustable positive voltage regulator designed to provide a stable and precisely regulated output voltage. This regulator is part of the LT317 family, known for its high-performance characteristics, making it suitable for various electronic applications requiring reliable voltage regulation.


Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.

  • ADJ (Pin 1): Adjustable output pin.
  • OUT (Pin 2): Regulated output voltage.
  • IN (Pin 3): Input voltage.
  • ADJ (Pin 4): Adjustable output pin.
  • OUT (Pin 5): Regulated output voltage.
  • IN (Pin 6): Input voltage.
  • ADJ (Pin 7): Adjustable output pin.
  • OUT (Pin 8): Regulated output voltage.

Circuit Diagram

Incorporate a circuit diagram that illustrates the connections and operation of the LT317AT voltage regulator for a more visual representation.

The circuit diagram above illustrates a typical application of the LT317AT voltage regulator. External components, such as resistors and capacitors, are connected to achieve stable and regulated power output.

Key Features

  • Adjustable Output Voltage: The LT317AT allows for an adjustable output voltage, providing flexibility in meeting specific voltage requirements.
  • High Output Current: With a high output current capability, this regulator can deliver power to a variety of loads.
  • Low Dropout Voltage: The LT317AT is designed with a low dropout voltage, ensuring efficient operation even when the input voltage is close to the desired output voltage.
  • Current Limit and Thermal Protection: The device includes built-in current limit and thermal protection features, enhancing its robustness and reliability.

Note: For detailed technical specifications, please refer to the LT317AT datasheet.


  • Power Supply Regulation: Ideal for regulating power supplies in various electronic devices.
  • Voltage Reference: Used as a stable voltage reference in precision analog circuits.
  • Battery-Powered Devices: Suitable for battery-operated devices where efficient power management is crucial.
  • Embedded Systems: Applied in embedded systems for voltage regulation and stabilization.


The LT317AT functions as an adjustable positive voltage regulator, maintaining a stable and precisely controlled output voltage. Its versatility and high-performance characteristics make it suitable for a wide range of applications.

Usage Guide

  • Input Power Connection: Connect the input power source to the IN pin.
  • Output Connection: Connect the load to the OUT pin.
  • Adjustable Output: Use the ADJ pin to set the desired output voltage.
  • External Components: Connect external resistors and capacitors as per the datasheet recommendations for stable operation.


For similar functionalities, consider these alternatives to the LT317AT:

LT317LZ: A low dropout voltage variant of the LT317 family.
LT317H: A high voltage variant capable of handling higher input voltages.

Frequently Asked Questions

Q: What is the dropout voltage of the LT317AT?
A: Refer to the datasheet for specified dropout voltage values under recommended operating conditions.

Q: Can the LT317AT be used in automotive applications?
A: Yes, the device is suitable for automotive applications with proper consideration of operating conditions.


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Source Content uid LT317AT Rohs Code No
Part Life Cycle Code Transferred Ihs Manufacturer LINEAR TECHNOLOGY CORP
Part Package Code TO-220 Package Description PLASTIC, TO-220, 3 PIN
Pin Count 3 Manufacturer Package Code T
Reach Compliance Code not_compliant ECCN Code EAR99
HTS Code 8542.39.00.01 Adjustability ADJUSTABLE
Dropout Voltage1-Nom 3 V Input-Output Voltage Differential-Max 40 V
Input-Output Voltage Differential-Min 3 V JESD-30 Code R-PSFM-T3
JESD-609 Code e0 Line Regulation-Max (%/V) 0.02
Load Regulation-Max(%) 1% Number of Functions 1
Number of Outputs 1 Number of Terminals 3
Operating Temperature TJ-Max 125 °C Operating Temperature TJ-Min
Output Current1-Max 1.5 A Output Voltage1-Max 37 V
Output Voltage1-Min 1.2 V Package Body Material PLASTIC/EPOXY
Package Equivalence Code SIP3,.1TB Package Shape RECTANGULAR
Package Style FLANGE MOUNT Qualification Status Not Qualified
Technology BIPOLAR Terminal Finish TIN LEAD OVER NICKEL
Terminal Form THROUGH-HOLE Terminal Pitch 2.54 mm
Terminal Position SINGLE

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