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Power Mosfets vs SCRs

Discussion in 'Electronic Design' started by [email protected], Jun 9, 2007.

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  1. Guest

    What's the highest current an SCR can handle versus a Power Mosfet? I
    assume SCRs are still way out in front but are Mosfets faster?

    W.King
     
  2. D from BC

    D from BC Guest

    Let's say an SCR and a Mosfet are in TO-220 packages.
    I'll say mosfet handles more current.
    (SCR Vsat vs Mos Rdson)

    As for speed contest...
    I dunno...
    But I'll guess mosfet again due to a push for advancements in
    efficient smps's..
    D from BC
     
  3. Wimpie

    Wimpie Guest

    Hi King,

    SCR are available in the high kA range, >1000V, Mosfets are available
    in the several 100 A range, There is also an IGBT that is also
    available in the kA range (of course not in standard semiconductor
    cases like TO 220, 247, etc). check www.eupec.com (part of
    infineon).

    When it comes to speed, the MOSFET is the fastest followed by the
    IGBT. Both MOSFET and IGBT can be turned of during conduction, the SCR
    will only turn off when the current drops below a certain value (hold-
    current).

    When it comes to high voltage application >600V, the IGBT outperforms
    the MOSFET (conduction losses in MOSFET are mostly higher because of
    high RDSon).

    Whether to use and SCR, IGBT or MOSFET depends on your application.
    Here also commercial aspects will count.

    When you do a search with both MOSFET, IGBT, thyristor and
    "comparison", you will probably find documents that will help you to
    make the right choice.

    Best regards,

    Wim
     
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