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BD679AS - onsemi

Description: Bipolar (BJT) Transistor NPN - Darlington 80 V 4 A 40 W Through Hole TO-126-3

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Symbol
BD679AS - onsemi - PCB symbol
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PCB Footprints
BD679AS - onsemi PCB footprint - Other - Other - TO-126_2025
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3D Models
BD679AS - onsemi - 3D model - Other - TO-126_2025
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BD679AS Details

  • Manufacturer Part Number:

    BD679AS

  • Brand Name:

    onsemi

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    TO-126-3

  • Manufacturer Package Code:

    340AS

  • Country Of Origin:

    Mainland China

  • ECCN Code:

    EAR99

  • Factory Lead Time:

    10 Weeks

  • Manufacturer:

    onsemi

  • YTEOL:

    4

  • Collector Current-Max (IC):

    4 A

  • Collector-Emitter Voltage-Max:

    80 V

  • Configuration:

    DARLINGTON

  • DC Current Gain-Min (hFE):

    750

  • JEDEC-95 Code:

    TO-126

  • JESD-30 Code:

    R-PSFM-T3

  • JESD-609 Code:

    e3

  • Number of Elements:

    1

  • Number of Terminals:

    3

  • Operating Temperature-Max:

    150 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Shape:

    RECTANGULAR

  • Package Style:

    FLANGE MOUNT

  • Polarity/Channel Type:

    NPN

  • Power Dissipation-Max (Abs):

    40 W

  • Qualification Status:

    Not Qualified

  • Surface Mount:

    NO

  • Terminal Finish:

    Matte Tin (Sn) - annealed

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Position:

    SINGLE

  • Transistor Application:

    SWITCHING

  • Transistor Element Material:

    SILICON

  • Transition Frequency-Nom (fT):

    10 MHz

BD679AS Frequently Asked Questions (FAQs)

  • A 2-layer or 4-layer PCB with a thermal relief pattern and a solid ground plane is recommended. Ensure a minimum of 1 oz copper thickness and a thermal via array under the IC to dissipate heat efficiently.
  • Use a capacitor with an ESR of 0.1 ohm or less, and add a 1-2 ohm resistor in series with the capacitor to dampen oscillations. Also, ensure the capacitor is rated for the output voltage and has a sufficient ripple current rating.
  • A low-ESR ceramic capacitor (X5R or X7R dielectric) with a value of 4.7-10 uF is recommended. This helps to filter input noise and reduce voltage ripple.
  • Use a TVS (Transient Voltage Suppressor) diode or a voltage clamp circuit at the input to protect the IC from voltage transients and surges. Ensure the TVS diode is rated for the maximum input voltage and has a sufficient power rating.
  • A shielded inductor with a value of 1-10 uH is recommended. The inductor should have a high saturation current rating and a low DCR (Direct Current Resistance) to minimize power losses.

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BD679AS Overview

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BD679AS Alternates

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Part Image BD679 Continental Device India Ltd

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Part Image BD679A Continental Device India Ltd

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Part Image BD679ASTU Fairchild Semiconductor Corporation

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Part Image BD679G onsemi

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Part Image BD679 Baneasa SA

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For a full list of alternate parts for BD679AS, check out Findchips.com