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'[EE] What do they use to label chips and why is it'
2010\01\02@152021 by Mark

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Over the years it seems like the labeling in chips has gone downhill. I
have some chips from the late 80's early 90's that you could read the
numbers off of from 5 feet away.
Why is it that a lot of the chips now have numbers so faded that I can
barely make it out in bright light ? Surely we have the tech to label
chips better.  What do they use to do
the labeling of chips now, apparently something is different form years
ago ?

Curious and going blind over  reading numbers off chips
Mark

2010\01\02@162631 by Dave Tweed

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Mark wrote:
> Over the years it seems like the labeling in chips has gone downhill. I
> have some chips from the late 80's early 90's that you could read the
> numbers off of from 5 feet away.
> Why is it that a lot of the chips now have numbers so faded that I can
> barely make it out in bright light ? Surely we have the tech to label
> chips better.  What do they use to do
> the labeling of chips now, apparently something is different form years
> ago ?

Nowadays, most chips are marked with lasers, which produces very fine lines
with low contrast.

They no longer use the nice white ink of days gone by.

It's helpful to keep a white-LED flashlight handy, so you can direct the
light on the chip at an angle that helps to bring up the contrast. Good
use for those cheap Chinese throw-aways.

-- Dave Tweed

2010\01\02@163712 by Sean Breheny

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Dave,

Do you know why they switched to ink-less marking? Is it cost combined
with the idea that the vast majority of ICs are auto pick/placed
anyway, and packages are often too small to have readable markings
anyway?

Sean


On Sat, Jan 2, 2010 at 4:26 PM, Dave Tweed <spam_OUTpicTakeThisOuTspamdtweed.com> wrote:
{Quote hidden}

> -

2010\01\02@172027 by David Duffy (AVD)

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I recall that the the ink markings used to rub off after a long time
rattling around in storage tubes. I agree the laser markings are harder
to read sometimes, but at least they're permanent.
David...

Sean Breheny wrote:
{Quote hidden}

--

___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: http://www.audiovisualdevices.com.au
___________________________________________

2010\01\02@173538 by Dave Tweed

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Sean Breheny wrote:
> On Sat, Jan 2, 2010 at 4:26 PM, Dave Tweed <picspamKILLspamdtweed.com> wrote:
> > Nowadays, most chips are marked with lasers, which produces very fine
> > lines with low contrast.
> >
> > They no longer use the nice white ink of days gone by.
>
> Do you know why they switched to ink-less marking? Is it cost combined
> with the idea that the vast majority of ICs are auto pick/placed
> anyway, and packages are often too small to have readable markings
> anyway?

I can only guess, but I'm sure it's 99% about cost. Plus the flexibility
of being able to change what's being written on the fly. Plus having to
cram ever-increasing amounts of information on shrinking packages.

For a while, they used a hybrid system -- the main part number, logo, etc.
would be done in ink, but date codes, speed grades, etc. would be done
with laser just prior to binning. Eventually, they realized they could
do away with the ink step altogether and write everything with the laser.

-- Dave Tweed

2010\01\02@183340 by ivp

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>I recall that the the ink markings used to rub off after a long time

I've a lot of old unused chips and transistors with very tatty markings.
Is that a D ? B ? 8 ? Always take a magnifier when shopping because
parts sometimes aren't in the right bin and it's a PITA to get home and
find one of the four you needed is not right

2010\01\02@184335 by AK

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heheh where do you shop that you can still buy chips out of bins?

On Sat, Jan 2, 2010 at 6:33 PM, ivp <.....joecolquittKILLspamspam.....clear.net.nz> wrote:
>
>>I recall that the the ink markings used to rub off after a long time
>
> I've a lot of old unused chips and transistors with very tatty markings.
> Is that a D ? B ? 8 ? Always take a magnifier when shopping because
> parts sometimes aren't in the right bin and it's a PITA to get home and
> find one of the four you needed is not right
> -

2010\01\02@205545 by ivp

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> heheh where do you shop that you can still buy chips out of bins?

A couple of local retailers still do, one only just

http://www.dse.co.nz/dse.shop/

Who are continually phasing out anything useful to the hobbiest !!!
Annoyingly, (sure it's customers and staff, not me, other people ;-) )
parts get mixed up in the drawers and bins, so a quick grab without
checking is a risky business. I can just about make out ICs but things
like zeners need a magnifier

http://www.jaycar.co.nz  (local)  http://www.jaycar.com  (global)

Much better stock range and control

My other usual supplier for ones and twos is RadioSpares. Only
once in > 20 years have I been sent the wrong part. At their prices
you'd hope so (although, to be fair, if you shop right they're not so
bad)

2010\01\02@205820 by ivp

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I wrote

> hobbiest

Good grief. I knew 'hobbiest' was wrong but I sent it anyway. Hobbyist

2010\01\03@103816 by PICdude

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There's a place in Austin TX called "MC Howard Electronics".  They  
sell a lot of leftovers that they get from electronics manufacturers  
and CEMs, and used PC components, etc.  Surprisingly, I've found many  
current parts such as National switchers, SMD TTL chips, 0603, 0805  
resistors & caps, etc, even full reels for pennies on the dollar.  
Great place to get all sorts of connectors for cheap also.

Cheers,
-Neil.



Quoting AK <EraseME00spam_OUTspamTakeThisOuTcase.edu>:

> heheh where do you shop that you can still buy chips out of bins?
>
> On Sat, Jan 2, 2010 at 6:33 PM, ivp <joecolquittspamspam_OUTclear.net.nz> wrote:
>>
>>> I recall that the the ink markings used to rub off after a long time
>>
>> I've a lot of old unused chips and transistors with very tatty markings.
>> Is that a D ? B ? 8 ? Always take a magnifier when shopping because
>> parts sometimes aren't in the right bin and it's a PITA to get home and
>> find one of the four you needed is not right
>> --

2010\01\03@135551 by Mark Perri

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We have HSC up here that has a bunch of stuff in bins.  Great place.
Mark

On Sun, Jan 3, 2010 at 7:37 AM, PICdude <@spam@picdude3KILLspamspamnarwani.org> wrote:

{Quote hidden}

2010\01\04@101438 by Giles Honeycutt

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It is a boring mind that can spell a word only one way.

Dyslexics of the world, UNTIE!

Giles Honeycutt

ivp wrote:
> I wrote
>
>  
>> hobbiest
>>    
>
> Good grief. I knew 'hobbiest' was wrong but I sent it anyway. Hobbyist
>  

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