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Electronic components (black)

  1. Dec 6, 2009 #1
    What is this ( the black colour one )?
     

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  2. jcsd
  3. Dec 6, 2009 #2

    vk6kro

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    Science Advisor

    Re: Electronic components

    That is an integrated circuit. They are made like this in cheap, mass produced equipment.
    I have seen one in a digital thermometer.

    They look like a blob of plastic, but they are fairly immune to vibration and moisture. However if they failed, the whole printed circuit board would have to be discarded.
     
  4. Dec 6, 2009 #3

    berkeman

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    Staff: Mentor

    Re: Electronic components

    Just to add a little bit to vk6kro's post -- it's called "chip on board", or COB. It's a technique for assembling an IC die onto a PCB, without first injection molding the die into a plastic package with leads, and soldering that onto the PCB. As vk6kro says, it is used in high-volume manufacturing of inexpensive devices, generally, and does not offer any rework capability.
     
  5. Dec 7, 2009 #4
    Re: Electronic components

    this one !! What is this ?
     

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  6. Dec 7, 2009 #5

    vk6kro

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    Re: Electronic components

    Yes, that one. It is an integrated circuit.
     
  7. Dec 7, 2009 #6

    berkeman

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    Staff: Mentor

    Re: Electronic components

    More info on COB:

    http://www.siliconfareast.com/cob.htm

    Once the die is wire bonded to pads on the PCB, it is covered by that black plastic blob to passivate it.
     
  8. Dec 8, 2009 #7
    Re: Electronic components

    wat is the symbol?
     
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