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Optocouplers

Discussion in 'Electronic Design' started by Steve, Sep 8, 2006.

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  1. Steve

    Steve Guest

    Optocouplers.
    I'm looking for an alternative to the Isocom CSM170. I only want a
    handful and they are talking in MOQ terms of 1000 pcs :-(

    It appears to be the holy grail of opto/layout solutions for a micro
    controller port. I'm surprised there isn't anything out there... or is
    there ?

    MTIA,


    - Steve
     
  2. Eeyore

    Eeyore Guest

    What's that ?

    Graham
     
  3. James Beck

    James Beck Guest

    I went to www.isocom.com and did a search for CSM170 and had no hits at
    all. Tried just the "CSM" and the "170" also no joy. Gonna need more
    info than a part number that does not work.

    Jim
     
  4. Steve

    Steve Guest

    The clue was in the title, but take a look here:-

    http://www.yi23.dial.pipex.com/csm170.htm


    - Steve
     
  5. Joerg

    Joerg Guest

    Hello Steve,

    While a multi-opto is nice it is IMHO not the holy grail if Digikey
    doesn't carry it and you can't get low qties anywhere. Maybe you could
    look at 4-ch versions that are more available. NEC, Toshiba etc.
     
  6. Joerg

    Joerg Guest

  7. Steve

    Steve Guest

    4ch is clearly a step in the right direction, but if you want to
    optoisolate a whole port at once then the CSM170 would be a lovely chip
    to use. I'm currently using a 6N137, which means one chip per pin.
    Obviously a pin to pin layout would make life oh so much easier for
    layout purposes.
    Afterall, I have an 8ch driver in the ULN2803A on the output port, so
    something to match on the other side of the MCU would be perfect.


    - Steve
     
  8. Steve

    Steve Guest

    try http://www.yi23.dial.pipex.com/csm170.htm

    - Steve
     
  9. Joerg

    Joerg Guest

    Hello Steve,

    The 137 is a good device. I used the CNW137 wide body version a lot.

    Sure. But I try to stay away from boutique parts. They may offer a
    really elegant solution and then bite you from behind. For example when
    the purchasing manager shows up in your office all red in the face
    because his buyers can't get any.

    Depending on what is transmitted there may be other options. I like LAN
    transformers for isolated transfers. Of course, then you need Schmitts
    on the other side and you may have to nudge them into a start position
    after system turn-on if needed.
     
  10. Eeyore

    Eeyore Guest

    I gather that much but someone else had already tried to find it and failed.

    Ok. So what's the problem ?

    Graham
     
  11. Steve

    Steve Guest

    It's a 8 opto package.


    - Steve
     
  12. Steve

    Steve Guest

    Absolutely..!

    I was chatting with one of our engineers, and he agreed that seems an
    obvious part when you think about it. I'm surprised that the bigger
    companies have never made such a thing.

    The main reason I need opto's, is because I'm using 24V throughout the
    rest of the kit (hence the 2803) with photocells and limit switches on
    inputs and pneumatic valves on the outputs, all in a very noisy
    environment, a factory !

    Ho hum... looks like the two quads I have sitting in front of me are
    going to get designed in instead.

    - Steve
     
  13. Eeyore

    Eeyore Guest

    And ?

    Graham
     
  14. John Fields

    John Fields Guest

     
  15. Steve

    Steve Guest

    And ?

    Graham
    [/QUOTE]

    It's 18 pin.

    - Steve
     
  16. Eeyore

    Eeyore Guest

    Really ?

    I'm actually asking him to get to the point ! Something that didn't happen 'til
    recently.

    Graham
     
  17. Eeyore

    Eeyore Guest

    It's 18 pin.[/QUOTE]

    And you want 8 couplers in one package ?

    If it's a DIL package you're currently using, why not use a couple of SMD quads
    instead ?

    Graham
     
  18. John Fields

    John Fields Guest

     
  19. John Fields

    John Fields Guest

     
  20. Steve

    Steve Guest

    I figured that, I'm just playing with him now...


    - Steve
     
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