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UC3842J - Texas Instruments

Description: Regulator Output DC-DC Controller IC

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UC3842J - Texas Instruments - PCB symbol
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UC3842J - Texas Instruments PCB footprint - Ceramic Dual-In-Line Packages - Ceramic Dual-In-Line Packages - JG (R-GDIP-T8
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UC3842J - Texas Instruments - 3D model - Ceramic Dual-In-Line Packages - JG (R-GDIP-T8
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UC3842J Details

  • Manufacturer Part Number:

    UC3842J

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    DIP

  • Pin Count:

    8

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    28 V

  • Input Voltage-Min:

    11.5 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-GDIP-T8

  • JESD-609 Code:

    e0

  • Length:

    9.58 mm

  • Number of Functions:

    1

  • Number of Terminals:

    8

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Max:

    5.1 V

  • Output Voltage-Min:

    4.9 V

  • Output Voltage-Nom:

    5 V

  • Package Body Material:

    CERAMIC, GLASS-SEALED

  • Package Code:

    DIP

  • Package Equivalence Code:

    DIP8,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    IN-LINE

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    5.08 mm

  • Supply Current-Max (Isup):

    25 mA

  • Supply Voltage-Max (Vsup):

    28 V

  • Supply Voltage-Min (Vsup):

    16 V

  • Supply Voltage-Nom (Vsup):

    11 V

  • Surface Mount:

    NO

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Tin/Lead (Sn/Pb)

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Pitch:

    2.54 mm

  • Terminal Position:

    DUAL

  • Width:

    7.62 mm

UC3842J Frequently Asked Questions (FAQs)

  • The maximum voltage rating for the UC3842J is 30V. However, it's recommended to operate it within 15V to ensure reliable operation and to prevent damage to the internal circuitry.
  • The frequency of the UC3842J oscillator can be calculated using the formula: f = 1.12 / (Rt * Ct), where Rt is the resistance between the RT pin and ground, and Ct is the capacitance between the CT pin and ground.
  • The soft-start pin (SS) on the UC3842J is used to slowly ramp up the output voltage during startup, reducing inrush current and preventing voltage overshoots. It can be connected to a capacitor to ground to set the soft-start time.
  • While the UC3842J is primarily designed as a PWM controller, it can be used as a voltage regulator in certain applications. However, it's not recommended as it's not optimized for voltage regulation and may not provide the same level of performance as a dedicated voltage regulator IC.
  • To ensure the UC3842J is stable and doesn't oscillate, make sure to follow the recommended layout guidelines, use a stable voltage supply, and add decoupling capacitors to the power pins. Additionally, ensure that the feedback loop is properly compensated and the output filter is designed to minimize ringing.

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UC3842J Overview

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About Texas Instruments

Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.

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For a full list of alternate parts for UC3842J, check out Findchips.com