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LM238K - STMicroelectronics

Description: Linear Voltage Regulator IC Positive Adjustable 1 Output 5A TO-3 , 35V , 1.2V ~ 32V , 5A , -25°C ~ 150°C

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LM238K - STMicroelectronics - PCB symbol
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PCB Footprints
LM238K - STMicroelectronics PCB footprint - Other - Other - TO-3_2026-2.2
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LM238K - STMicroelectronics - 3D model - Other - TO-3_2026-2.2
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LM238K Details

  • Manufacturer Part Number:

    LM238K

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Part Package Code:

    TO-204AA

  • Package Description:

    METAL CAN, TO-3, 2 PIN

  • Pin Count:

    2

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    0

  • Adjustability:

    ADJUSTABLE

  • Dropout Voltage1-Nom:

    3 V

  • Input-Output Voltage Differential-Max:

    35 V

  • Input-Output Voltage Differential-Min:

    3 V

  • JESD-30 Code:

    O-MBFM-P2

  • JESD-609 Code:

    e3

  • Line Regulation-Max (%/V):

    0.04

  • Load Regulation-Max(%):

    0.6%

  • Number of Functions:

    1

  • Number of Outputs:

    1

  • Number of Terminals:

    2

  • Operating Temperature TJ-Max:

    150 °C

  • Operating Temperature TJ-Min:

    -25 °C

  • Output Current1-Max:

    5 A

  • Output Voltage1-Max:

    32 V

  • Output Voltage1-Min:

    1.2 V

  • Package Body Material:

    METAL

  • Package Code:

    TO-3

  • Package Equivalence Code:

    TO-204/-3

  • Package Shape:

    ROUND

  • Package Style:

    FLANGE MOUNT

  • Qualification Status:

    Not Qualified

  • Regulator Type:

    ADJUSTABLE POSITIVE SINGLE OUTPUT STANDARD REGULATOR

  • Surface Mount:

    NO

  • Technology:

    BIPOLAR

  • Terminal Finish:

    Matte Tin (Sn)

  • Terminal Form:

    PIN/PEG

  • Terminal Position:

    BOTTOM

LM238K Frequently Asked Questions (FAQs)

  • The maximum power dissipation of the LM238K is dependent on the package type and thermal conditions. For the TO-220 package, the maximum power dissipation is 2.2W at 25°C free air temperature. However, this value can be derated to 1.67W at 50°C and 1.33W at 75°C. It's essential to consult the thermal derating curve in the datasheet to determine the maximum power dissipation for specific operating conditions.
  • To ensure the stability of the LM238K voltage regulator, it's crucial to follow the recommended capacitor values and types for the input and output capacitors. A minimum of 1μF ceramic capacitor is recommended for the input capacitor, and a minimum of 10μF tantalum or 22μF ceramic capacitor is recommended for the output capacitor. Additionally, the output capacitor should be placed as close as possible to the regulator output pin to minimize parasitic inductance.
  • The minimum input voltage required for the LM238K to operate is 2V above the output voltage. For example, if the output voltage is 5V, the minimum input voltage should be at least 7V. However, it's recommended to maintain a minimum input voltage of 3V above the output voltage to ensure stable operation and to account for any voltage drops in the system.
  • Yes, the LM238K can be used as a variable voltage regulator by adding an external resistor divider network between the output pin and the adjust pin. The resistor values can be calculated using the formula provided in the datasheet. However, it's essential to ensure that the minimum input voltage requirement is met, and the output voltage is within the recommended range of 1.2V to 32V.
  • To protect the LM238K from overvoltage and undervoltage conditions, it's recommended to add external protection circuits such as overvoltage protection (OVP) and undervoltage protection (UVP) circuits. These circuits can be implemented using zener diodes, TVS diodes, or dedicated protection ICs. Additionally, it's essential to ensure that the input voltage is within the recommended range and that the regulator is not subjected to voltage transients or spikes.

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LM238K Overview

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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