LM338K Voltage Regulator: Pinout, Datasheet and Replacement

 What is a Voltage Regulator

A voltage regulator is an electronic circuit or device designed to maintain a consistent and stable output voltage level regardless of changes in input voltage, load current, or temperature. Its primary function is to provide a steady, regulated output voltage to power electronic components, ensuring their proper operation and reliability.

 

Voltage regulators are essential in various applications where maintaining a precise voltage level is crucial. They help prevent voltage fluctuations that could potentially damage sensitive electronic components or cause erratic behavior in circuits.

What is LM338K

The LM338K is a versatile adjustable 3-terminal positive voltage regulator with the ability to deliver more than 5 A across an output range spanning 1.2 V to 32 V. Its simplicity of operation stands out, necessitating only the use of 2 resistors to configure the output voltage. Meticulous circuit design has yielded remarkable load and line regulation, comparable to the performance of numerous commercial power supplies.

 

LM338K Pinout



LM338K Specification and Features

Specifications

  • Type: Regulator
  • Mount: Through Hole
  • Package / Case: TO-204AA, TO-3
  • Number of Pins: 2
  • Weight: 6.40101g
  • Operating Temperature: 0°C~125°C
  • Packaging: Tube
  • Tolerance: 5%
  • Part Status: Obsolete
  • Moisture Sensitivity Level: 1 (Unlimited)
  • Number of Terminations: 2
  • ECCN Code: EAR99
  • Terminal Finish: Tin (Sn)
  • Power Rating: 50W
  • Technology: Bipolar
  • Number of Functions: 1
  • Base Part Number: LM338
  • Pin Count: 2
  • Voltage - Input (Max): 35V
  • Output Voltage: 32V (Adjustable)
  • Max Output Current: 5A
  • Output Configuration: Positive
  • Number of Outputs: 1
  • Protection Features: Over Current, Over Temperature
  • PSRR: 75dB ~ 60dB (120Hz)
  • Reference Voltage: 1.29V
  • Dropout Voltage: 3V
  • Min Output Voltage: 1.2V
  • Power Supply Rejection Ratio (PSRR): 75dB
  • Max Output Voltage: 32V
  • Min Current Limit: 7A
  • Load Regulation-Max(%): 1%
  • Height: 8.7mm
  • Length: 39.5mm
  • Width: 26.2mm
  • RoHS Status: ROHS3 Compliant, Lead-Free

Features

  • Peak output current guarantee of 7 A
  • Guaranteed continuous output current of 5 A
  • Adjustable output voltage down to 1.2 V
  • Typically low line regulation of 0.005 % per volt
  • Typically excellent load regulation of 0.1 %
  • Assured thermal regulation
  • Constant temperature-independent current limit
  • Standard 3-lead transistor package

LM338K Replacement

LM350T

LM338K Application

  • Power supply units
  • Battery chargers
  • Adjustable voltage regulators
  • High-current circuits
  • Electronic equipment requiring stable voltage sources

LM338K Packages



LM338K Datasheet PDF

Download LM338K datasheet pdf here>>


FAQs of LM338K

What is the output voltage range of LM338K?

 

LM338K can deliver output voltages within a range of 1.2 V to 32 V.

 

What is the maximum output current of LM338K?

 

LM338K guarantees a peak output current of 7 A and a continuous output current of 5 A.

 

How is the output voltage adjusted in LM338K?

 

Adjusting the output voltage in LM338K requires using only two resistors in the external circuit.

 

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