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Integrated Circuit with PNP and NPN transistor as bypass gate

Discussion in 'General Electronics Discussion' started by hpfiend, May 23, 2013.

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  1. hpfiend

    hpfiend

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    Feb 20, 2013
    Ok guys/gals-

    I need some help with the lingo. In my mind it would be called a bypass gate but that isn't looking to be the case. What would an IC with a PNP and NPN transistor with shared Bases be called?

    Basically the main current travels path A until the switch current is applied to base of both transistors. The NPN switches on to open path B through the circuit and simultaneously the PNP switches off to close the path A.

    Thanks!
     
  2. GreenGiant

    GreenGiant

    842
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    Feb 9, 2012
    Sounds like you are describing a SPDT transistor gate of some sort, Im not sure if that exists in a single IC, but you can always use 2 transistors for it, one PNP, one NPN
     
  3. hpfiend

    hpfiend

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    Feb 20, 2013
    Yeah that is what I was going to do but thought it might already be built in one chip. I will search single pole double throw transistor gate.

    Thanks!
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
  5. hpfiend

    hpfiend

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    Feb 20, 2013
    Thanks for your response!

    Other than packaging and mechanical reliability would a SPDT relay be a better solution here to avoid the voltage drop through the transistors?
     
    Last edited: May 24, 2013
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    It depends entirely on your application.

    I'm also thinking that the device might be a bipolar half-bridge.

    You can easily get 2 transistors in a single package.
     
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