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White IC package color?

Discussion in 'Electronic Basics' started by DaveC, Jul 6, 2004.

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  1. DaveC

    DaveC Guest

    The CNY-17 optocoupler package is available in white as an option. I presume
    this is not semiconductor designer chic.

    What is the purpose for offering this in both white and black packages?

    Thanks,
     
  2. Hello Dave

    Maybe the white one is a ceramic package.

    It's possible that it has something to do with ambient temperature.

    Cheers
    Rune
     
  3. legg

    legg Guest

    Different mfrs use different body materials.

    One mfr will not likely offer both, but distributors offering more
    than one source for the part may do so. There is no practical
    difference.

    RL
     
  4. Clint Sharp

    Clint Sharp Guest

    Think you may find the white package has a higher certified breakdown
    voltage.
     
  5. Joerg

    Joerg Guest

    Hi Dave,

    A black body heats up more under light exposure than a white one does. I
    don't know whether that was the motivation behind it but it could be.

    Do they also come in pearl white :) ?

    Regards, Joerg
     
  6. John Larkin

    John Larkin Guest


    Why are there no blue ICs? Or red, or orange, or green?

    Purple would be nice.

    Some of the old 486 chips were sort of a blue-grey ceramic. They make
    excellent X-acto blade sharpeners.

    John
     
  7. Joerg

    Joerg Guest

    Hi John,
    They do or at least they used to. When I was a kid I built lots of stuff
    with TTL and there were some ICs that came in purple, others in blue.
    Then there were quad opamps that came in Hunter green. That's not a
    joke. The green ones looked the best.
    Just make sure there is no beryllium in them. Its oxide can lop some
    years off of your lifetime and that of those around you.

    Regards, Joerg
     
  8. John Larkin

    John Larkin Guest

    Good point. I was tempted to buy a bunch of custom-sliced BeO things a
    while back; it has the best thermal conductivity/dielectric constant
    ratio of anything except diamond. People will still cheerfully slice
    the stuff to your dims and sell it to you. Chickened out, what with
    the hazard to everybody, and used AlN, which is almost as good.

    I did soak a slice of AlN halfway in a cup of water for a couple of
    days, having read that moisture can decompose it into AlO2 and
    ammonia, or something. Didn't seem to affect it.

    John
     
  9. Jim Thompson

    Jim Thompson Guest

    Only inhaling the *dust* of BeO is harmful. You can eat it to your
    heart's content. At Dickson we sawed it under water.

    ...Jim Thompson
     
  10. Joerg

    Joerg Guest

    Hi Jim,
    Yes, Jim. And that's exactly what I am always concerned about. We all
    know the dangers but others who happen upon it may not realize the
    danger when dropping it. When it shatters and then someone just goes out
    and uses a broom to clean up the mess this could cause longer term grief.
    Way to go, but I still wouldn't eat it. I am certain that someone made
    sure the water was properly detoxed so it doesn't have a chance to
    puddle somewhere, dry out and the dust comes back to life.

    Regards, Joerg
     
  11. Jim Thompson

    Jim Thompson Guest

    It was a muddy looking combination of water, detergent and oil. I
    don't remember how we disposed of it; we dumped the TCE in a dry well
    ;-)

    ...Jim Thompson
     
  12. Guy Macon

    Guy Macon Guest

    Because black ICs dissapate heat better and run cooler.

    Given the trend to colorful motherboards, I expect to see
    PC chip sets in colors sometime in the future.
     
  13. Look at the data sheet: http://www.fairchildsemi.com/ds/CN/CNY17-3.pdf

    They have different specs in a number of areas- even the recommended
    SMT pad layout is different.


    Best regards,
    Spehro Pefhany
     
  14. John Larkin

    John Larkin Guest


    I used to work for this place in New Orleans. I designed a couple
    hundred million dollars worth of stuff for them before they fired me
    for insubordination. They had their own PCB shop, and disposed of all
    the used chemicals through a pipe that went through the wall. That's
    as far as it went.

    John
     
  15. Woah! Actual information.

    Lower capacitance, higher breakdown voltage, slightly lower current
    transfer ration (and higher linear resistance versus LED current.
    Looks like it has a longer light pipe between emitter and detector.
     
  16. DaveC

    DaveC Guest

  17. K Williams

    K Williams Guest

    Our chemical safety "experts" found out that HP pulse generators had
    chips with BeO substrates some years ago (well the manuals and chassis
    had Be warnings on 'em). The CS dweebs just about got HP to bend over
    for a quickie, when HP decided to modify the "danger" to a warning for
    disposal. Seriously. they were about to rip every pulse generator out
    of every lab and test set and ship 'em back with a bill attached.

    Silliness really, since the BeO was well encapsulated, and we weren't in
    the habit of snorting anything other than coffee, on a bad day.
     
  18. don't remember how we disposed of it; we dumped the TCE in a dry well
    Y'all been around long enough to know better than to post such stuff, Jim.
    Somebody of the gov't buttinskyish persuasion may read it, not see the
    smiley, and go ballistic.

    THen you is guilty until proven innocent *and* they's no way you can
    *prove* yourself innocent.

    ;-) (OK, that ";-)" makes it all bettter..., right? [;-)] )
     
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