Transmission gate

Discussion in 'General Electronics Chat' started by baseball07, Mar 12, 2008.

  1. baseball07

    Thread Starter Active Member

    Apr 24, 2007
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    Hello I am looking to breadboard a few simple transmission gates and I was wondering what would be good to use for the n and p mos transistors. Such as which part numbers are most commonly used. I have access to a lab with a variety of different components. Thank you.
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    A transmission gate is an IC kinda thing. Nobody in their right mind would build one from discrete components because there is no need. It would be like building an opamp from discrete transistors. Yes, I know the original opamps were built from vacuum tubes and discrete components.

    In addition your choices for matched complementary n-mos and p-mos FETs are extremely limited precisely because nobody uses them that way anymore,
     
  3. baseball07

    Thread Starter Active Member

    Apr 24, 2007
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    What part is this? Is it one of those 7400 series logic ics?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    No, look for analog switches. Analog Devices and Maxim make them. Or you can get a CD4066.
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    I should have said that it was a CMOS IC thing. Another part you may find interesting is the CD4007. It is a dual complementary pair plus an inverter. This one confused me for a minute. See if you can spot the interter.
     
  6. baseball07

    Thread Starter Active Member

    Apr 24, 2007
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  7. beenthere

    Retired Moderator

    Apr 20, 2004
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    Yes. That device has been discontinued. The 4066 is the replacement. If you want to make anything beyond experimental usage, get hold of the 4066.
     
  8. baseball07

    Thread Starter Active Member

    Apr 24, 2007
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    Ok great. My last question. Do they make these CMOS ICs that just have pmos transistors in them? I am bread boarding this Cadence circuit and I need about 5 pmos transistors and one nmos to make a timer.
     
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