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'[PICLIST] [OT][BUY]: Surface mount chips and logic'
2001\02\22@203323 by Jane Ifurung

picon face
As the design gets bigger, we always wanted to have
smaller chips to be fitted in the circuit board.
I'm looking for manufacturers of surface mount logic
gates/chips. There are some who have the SMT
capacitors but I haven't seen SMT logic gates.

I'm hoping for your help.

Thanks in advance,
Jane





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2001\02\22@205201 by Thomas C. Sefranek

face picon face
Jane Ifurung wrote:

> As the design gets bigger, we always wanted to have
> smaller chips to be fitted in the circuit board.
> I'm looking for manufacturers of surface mount logic
> gates/chips. There are some who have the SMT
> capacitors but I haven't seen SMT logic gates.

SERIOUSLY?  You could not have looked very much,
or you misunderstand the nomenclatures.
They are VERY common!
There are even SMT SINGLE gates, by Fairchild.
Inverters, AND, OR etc.

I just grabbed the latest Digi-key catalog.
EVERY logic series has both DIP and S0-14, SO-16 etc. (SMT) packages.

{Quote hidden}

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2001\02\22@205402 by Dan Michaels

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At 05:33 PM 2/22/01 -0800, you wrote:
>As the design gets bigger, we always wanted to have
>smaller chips to be fitted in the circuit board.
>I'm looking for manufacturers of surface mount logic
>gates/chips. There are some who have the SMT
>capacitors but I haven't seen SMT logic gates.
>

TI has about a million.

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2001\02\23@043619 by Alan B. Pearce

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>There are some who have the SMT
>capacitors but I haven't seen SMT logic gates.

They are around, to a point where you can get single gates in a chip instead of
having to have 4 identical gates in a chip. Check out the likes of Rohm. One
supplier you may like to check for surface mount stuff is Flint
http://www.flint.co.uk at least for information on what is available. I have not
bought from them, but a colleague has found them useful.

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2001\02\23@064125 by Roman Black

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Alan B. Pearce wrote:
>
> >There are some who have the SMT
> >capacitors but I haven't seen SMT logic gates.
>
> They are around, to a point where you can get single gates in a chip instead of
> having to have 4 identical gates in a chip. Check out the likes of Rohm. One
> supplier you may like to check for surface mount stuff is Flint
> http://www.flint.co.uk at least for information on what is available. I have not
> bought from them, but a colleague has found them useful.


I use single gates a lot. OR gate= two resistors
and a transistor. AND gate= three R and a tran.
And all sorts of goodies once you add a diode or two!!

Everybody is so lazy these days... I am lucky that
on a daily basis I get to study new circuit diagrams
for cheapie electronics appliances, and yes, the real
big manufacturers still do everything with transistors
and diodes. Apart from LSI of course. Must be that
the good old transistor and diode are still cheaper
and better in huge quantities than cool gizmos
like one gate in a chip!!

Am I the only person here who sticks transistors
between logic chips with hardly a thought?? Or
are people scared by a one-transistor logic
inverter?? Bob?? You with me here?? :o)
-Roman

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2001\02\23@072536 by Thomas C. Sefranek

face picon face
Roman Black wrote:

> I use single gates a lot. OR gate= two resistors
> and a transistor. AND gate= three R and a tran.
> And all sorts of goodies once you add a diode or two!!
>
> Everybody is so lazy these days... I am lucky that
> on a daily basis I get to study new circuit diagrams
> for cheapie electronics appliances, and yes, the real
> big manufacturers still do everything with transistors
> and diodes. Apart from LSI of course. Must be that
> the good old transistor and diode are still cheaper
> and better in huge quantities than cool gizmos
> like one gate in a chip!!

I can't disagree more!  In my world, the cost of a lot of the
new "cool gizmos like one gate in a chip" is equavalent to
the cost of a single transistor.  Hey, the shipping is often an
order of magnetude more than the cost of the devices.

> Am I the only person here who sticks transistors
> between logic chips with hardly a thought?? Or
> are people scared by a one-transistor logic
> inverter?? Bob?? You with me here?? :o)

No, you are not the only person.  Been there, done that.
BUT... There comes a time when installing a surface mount TINY
inverter or an AND gate on an existing pc trace is WAY more
attractive and effective.

>
> -Roman
>
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2001\02\23@131721 by Dan Michaels

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Roman Black wrote:

>
>Am I the only person here who sticks transistors
>between logic chips with hardly a thought?? Or
>are people scared by a one-transistor logic
>inverter?? Bob?? You with me here?? :o)

Roman,

I use transistors all over the place in my designs. And
usually BJTs.

IMXO, the single most useful topic when teaching/studying/learning
electronics is to spend a "lot" of time/effort to get down a complete
understanding of NPN inverter operation - biasing, gain, ac operation,
bandwidth, leakage, coupling, power dissipation, linear versus
nonlinear operation, on and on. Once you really understand how "all"
of these aspects integrate together in the design of a typical circuit,
the rest of electronics is cake.

[BTW, you don't quite get the same level of understanding if
you jump to MOSFETs too soon in the process].

- dan michaels
http://www.oricomtech.com
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2001\02\23@152331 by Bill Westfield

face picon face
> Must be that the good old transistor and diode are still cheaper and
> better in huge quantities than cool gizmos like one gate in a chip!!
       :
> Am I the only person here who sticks transistors between logic chips
> with hardly a thought?? Or are people scared by a one-transistor
> logic inverter??

"Huge quantities" is sort of key, here.  In small quantities, your
transistor can be more expensive than a DIP full of logic gates.  Reminds
me of my early days as an electronics hobbyist.  I kept lusting after
assorted electronics projects from books, "popular electronics", and the
like, but the local dealer's (Laffyette?) prices would start at about $1
for a random transistor, so I didn't even bother glancing at the projects
based on integrated circuits ("must be impossibly expensive") - then I
started reading the ads in the back of the magazines - 7400's for $0.16
each?!!  Time to re-appraise my ecconomics.

These days a "typical" transistor (5/$1) is slightly less expensive than
a typical SSI IC ($0.25), but it's still pretty close on a gate level.
OTOH, prices for either one are very low indeed (adjusting for inflation.)
On the third hand, I now have a well-stocked parts bin full of assorted
"free" parts in both the IC and transistor variety...

(of course, we're all microprocessor geeks here.  If you need a signal
inverted, the cheapest way is to change the software...)

BillW

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