How Many Transistors On A Silicon Wafer?

  • Thread starter Watson A.Name - \"Watt Su
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Watson A.Name - \"Watt Su

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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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On Sat, 15 May 2004 19:27:02 -0700, "Watson A.Name - \"Watt Sun, the Dark
Remover\"" <NOSPAM@dslextreme.com> wrote:

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.
Click to expand...
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
--
Peter & Rita Forbes
diesel@easynet.co.uk
Engine pages for preservation info:
http://www.oldengine.org/members/diesel
 
"Peter A Forbes" <diesel@easynet.co.uk> wrote in message
news:er3ea05ad1h2vvmni82obl5e0899cs9u8v@4ax.com...
On Sat, 15 May 2004 19:27:02 -0700, "Watson A.Name - \"Watt Sun, the
Dark
Remover\"" <NOSPAM@dslextreme.com> wrote:

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.

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.
Click to expand...
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.

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

Peter
--
Peter & Rita Forbes
diesel@easynet.co.uk
Engine pages for preservation info:
http://www.oldengine.org/members/diesel
Click to expand...


--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
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