Does such a part exist?

Discussion in 'The Projects Forum' started by JDR04, Jul 23, 2012.

  1. JDR04

    Thread Starter Active Member

    May 5, 2011
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    I'm looking for a single two input NOR GATE. I need a high output on two single low inputs. Hope I explained this well enough??

    I can only find ones that are surface mount. I need one that is in a pin through hole configuration.I can't use the quad ones as I am extremely limited for space.

    Could someone tell me if such a part exists with a Pin through Hole configuration?

    Thanks everyone -JDR04:confused:
     
  2. grahamed

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    Jul 23, 2012
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    Have a look at RTL - resistor-transistor logic - old tech but still works..
     
  3. praondevou

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    Jul 9, 2011
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  4. tracecom

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    Do you have room for 2 transistors and 3 resistors?
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    No it does not. Nobody is making through hole parts any more. The only ones still in the supply pipeline were manufactured years ago. We are now in the third decade of the SMT revolution. The single gate parts are in SOT23-5 packages.
     
  6. THE_RB

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    Nice circuit, and could also be done with one transistor and 3 resistors. :)
     
  7. takao21203

    Distinguished Member

    Apr 28, 2012
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    use a PIC 10F200- 8 pin IC.

    If you don't need MHz range speed.
     
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  8. grahamed

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    Jul 23, 2012
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    3 resistors and 1 transistor - yes that's RTL. And 2 diodes, 1 transistor and 1 resistor would be DTL.
     
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  9. tracecom

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    Apr 16, 2010
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    It's from a Forrest Mims book.
     
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  10. ErnieM

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    Apr 24, 2011
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    I began doing digital logic in the 70's using RTL logic. Believe it or not the local department store (name forgotten, long out of business) had some Motorola RTL IC's, metal can TO-8 packages in their electronics department, probably right next to the tube tester. They were very expensive, but they had them! Lafayette Electronics also had them (a bit more reasonably) plus some header boards.

    I began making some of my own gates using that same schematic copied off the packaging.

    @JDR04: You can get adapter boards to convert SMD parts to 0.1" pinouts for breadbording. If you are clever and careful you may even be able to hand solder them down to 0.1" pad breadboards. But for "wireless" breadboards you'll need those adapters. I can post an EBay link if you need one.
     
  11. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks for the link, certainly useful stuff to know - JDR04
     
  12. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks tracecom, I'll give it a try if you dont mind. - JDR04
     
  13. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks Papabravo- kind of wondered why but now I know. JDR04
     
  14. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks The RB, sure would appreciate it if you could show me how. JDR04
     
  15. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks ErnieM, I would appreciate the ebay link so I can have a look.Cheers JDR04
     
  16. THE_RB

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    Connect the 2 inputs through 2 resistors (10k?) into the base of a NPN transistor.

    The NPN emitter goes to ground.

    The output of the NOR gate is the NPN collector. It needs a pull-up resistor, 1k is probably fine.
     
  17. JDR04

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    May 5, 2011
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    Thanks for your time on this THE RB, it's appreciated. JDR04
     
  18. ErnieM

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    Apr 24, 2011
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    Here's the one I use. It's made for an SOIC package but a SOT will span the pins and make connections. I keep this vendor in my saved area, they have lots of good stuff.

    This looks like a more exact fit but costs a lot more (and I never used that vendor).
     
  19. JDR04

    Thread Starter Active Member

    May 5, 2011
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    Thanks ErnieM, really do appreciate your help on this - JDR04
     
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