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SMT equivalent or better to the 2n3904?

Discussion in 'Electronic Basics' started by Hammy, Oct 7, 2007.

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  1. Hammy

    Hammy Guest

    Can anyone recommend a SMT equivalent or better to the 2n3904? Either
    they don't make 2n3904 in SMT or Digikey doesn't stock it. I've been
    looking through Digikeys SMT BJT's and it seems that the 2n3904 has
    superior switching characteristics (storage, rise and fall) then the
    SMT BJT's I've looked at. I can't believe that the old 2n3904 is state
    of the art for switching.

    Any recommendations welcome.

  2. MMBT3904

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  3. Eeyore

    Eeyore Guest

  4. Hammy

    Hammy Guest

  5. Jamie

    Jamie Guest


    You may want to test it in a stand alone simple
    DC test circuit.

    We recently had an issue with a MMBT2222 from fairchild
    which was very strange. A new batch was sent to us that
    solved the problem.

    I remember a few years ago having issues with the KA723
    voltage regulators. A near by but not hit lightning strike
    with equipment disconnected 50% probability cause the
    KA723 to be fail due to strong static field build up from
    the strike. The net results would be. The regulator would
    not regulate any more but drive full rail voltage to the
    power transistors. This wasn't a desirable effect with the connected
    equipment. Most of the supplies that use those had a cheap crowbar
    circuit in it to force blow the fuse which was a plus.

    I always kept stock of LM723's to replace them with.
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