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How Many Transistors On A Silicon Wafer?

Discussion in 'Electronic Components' started by Watson A.Name - \Watt Sun, the Dark Remover\, May 16, 2004.

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  1. I'm talking about discrete transistors, like a 2N3904 or 2N4401, not an
    IC. I guess it depends on the size of the wafer itself, which might be
    4 inch, or maybe bigger? Like they're making 8" and 12" wafers for CPU
    chips now. And then there is the size of the transistor die itself. I
    would guess that there could be a couple hundred dies on each edge of a
    square superimposed on the wafer, so that could be 200 times 200 or 40
    thousand per, give or take several tens of thousands.


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  2. I have a selection of 6" and 4" wafers at our factory, and I'll have a check on
    them in the week.

    I believe that they are not discretes though, probably Ic's.

    What was interesting to me was that the print/etch runs off the edges with no
    attempt to trim the image to suit the wafer, so there are a lot of unusable dies
    around the periphery of the wafer.

    I had one framed a while ago, looks nice on the wall and makes a good
    conversation piece :))

    Peter
     
  3. I think the reason for that is that the imaging system is much like the
    eye of an insect. The single die image is duplicated multiple times by
    the imaging system, without regard for the wafer itself.


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