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Current controlled fet?

Discussion in 'Electronic Design' started by Jon Slaughter, Dec 22, 2009.

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  1. We have IGBT's but what about the reverse? A mosfet like device who's gate
    is current controlled? This might not seem very useful but they would remove
    the need for special drivers?
  2. Tim Williams

    Tim Williams Guest

    Or if you want another 4-layer structure, they make SCRs, and complementary
    to IGBTs, they also make IG SCRs (I forget the proper acronym).

    Structurally, a BJT is indeed analogous. That reminds me, I need to find a
    four-lead MOSFET and see if I can use its substrate as base of an NPN. I'm
    guessing beta is poor, but might be equal in both directions.

  3. Guest

    Tim - looking for an isolation transistor for a "wired-or" bus? If so,
    look at some of the 2 transistor 6 pin devices from Rohm & ? & ? - don't
    rember the names. Both way gain isn't shown in the specs & you'll need
    to get them and measure for that spec. The ones I've seen were quite
    effective on a 5v bus.


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