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White IC package color?

D

DaveC

Jan 1, 1970
0
The CNY-17 optocoupler package is available in white as an option. I presume
this is not semiconductor designer chic.

What is the purpose for offering this in both white and black packages?

Thanks,
 
R

Rune Christensen

Jan 1, 1970
0
Hello Dave

Maybe the white one is a ceramic package.

It's possible that it has something to do with ambient temperature.

Cheers
Rune
 
L

legg

Jan 1, 1970
0
The CNY-17 optocoupler package is available in white as an option. I presume
this is not semiconductor designer chic.

What is the purpose for offering this in both white and black packages?

Different mfrs use different body materials.

One mfr will not likely offer both, but distributors offering more
than one source for the part may do so. There is no practical
difference.

RL
 
C

Clint Sharp

Jan 1, 1970
0
DaveC said:
The CNY-17 optocoupler package is available in white as an option. I presume
this is not semiconductor designer chic.

What is the purpose for offering this in both white and black packages?
Think you may find the white package has a higher certified breakdown
voltage.
 
J

Joerg

Jan 1, 1970
0
Hi Dave,

A black body heats up more under light exposure than a white one does. I
don't know whether that was the motivation behind it but it could be.

Do they also come in pearl white :) ?

Regards, Joerg
 
J

John Larkin

Jan 1, 1970
0
Hi Dave,

A black body heats up more under light exposure than a white one does. I
don't know whether that was the motivation behind it but it could be.

Do they also come in pearl white :) ?

Regards, Joerg


Why are there no blue ICs? Or red, or orange, or green?

Purple would be nice.

Some of the old 486 chips were sort of a blue-grey ceramic. They make
excellent X-acto blade sharpeners.

John
 
J

Joerg

Jan 1, 1970
0
Hi John,
Why are there no blue ICs? Or red, or orange, or green?
Purple would be nice.
They do or at least they used to. When I was a kid I built lots of stuff
with TTL and there were some ICs that came in purple, others in blue.
Then there were quad opamps that came in Hunter green. That's not a
joke. The green ones looked the best.
Some of the old 486 chips were sort of a blue-grey ceramic. They make
excellent X-acto blade sharpeners.
Just make sure there is no beryllium in them. Its oxide can lop some
years off of your lifetime and that of those around you.

Regards, Joerg
 
J

John Larkin

Jan 1, 1970
0
Hi John,


They do or at least they used to. When I was a kid I built lots of stuff
with TTL and there were some ICs that came in purple, others in blue.
Then there were quad opamps that came in Hunter green. That's not a
joke. The green ones looked the best.

Just make sure there is no beryllium in them. Its oxide can lop some
years off of your lifetime and that of those around you.

Good point. I was tempted to buy a bunch of custom-sliced BeO things a
while back; it has the best thermal conductivity/dielectric constant
ratio of anything except diamond. People will still cheerfully slice
the stuff to your dims and sell it to you. Chickened out, what with
the hazard to everybody, and used AlN, which is almost as good.

I did soak a slice of AlN halfway in a cup of water for a couple of
days, having read that moisture can decompose it into AlO2 and
ammonia, or something. Didn't seem to affect it.

John
 
J

Jim Thompson

Jan 1, 1970
0
Good point. I was tempted to buy a bunch of custom-sliced BeO things a
while back; it has the best thermal conductivity/dielectric constant
ratio of anything except diamond. People will still cheerfully slice
the stuff to your dims and sell it to you. Chickened out, what with
the hazard to everybody, and used AlN, which is almost as good.

I did soak a slice of AlN halfway in a cup of water for a couple of
days, having read that moisture can decompose it into AlO2 and
ammonia, or something. Didn't seem to affect it.

John

Only inhaling the *dust* of BeO is harmful. You can eat it to your
heart's content. At Dickson we sawed it under water.

...Jim Thompson
 
J

Joerg

Jan 1, 1970
0
Hi Jim,
Only inhaling the *dust* of BeO is harmful. ...
Yes, Jim. And that's exactly what I am always concerned about. We all
know the dangers but others who happen upon it may not realize the
danger when dropping it. When it shatters and then someone just goes out
and uses a broom to clean up the mess this could cause longer term grief.
... You can eat it to your heart's content. At Dickson we sawed it under water.
Way to go, but I still wouldn't eat it. I am certain that someone made
sure the water was properly detoxed so it doesn't have a chance to
puddle somewhere, dry out and the dust comes back to life.

Regards, Joerg
 
J

Jim Thompson

Jan 1, 1970
0
Hi Jim,

Yes, Jim. And that's exactly what I am always concerned about. We all
know the dangers but others who happen upon it may not realize the
danger when dropping it. When it shatters and then someone just goes out
and uses a broom to clean up the mess this could cause longer term grief.

Way to go, but I still wouldn't eat it. I am certain that someone made
sure the water was properly detoxed so it doesn't have a chance to
puddle somewhere, dry out and the dust comes back to life.

Regards, Joerg

It was a muddy looking combination of water, detergent and oil. I
don't remember how we disposed of it; we dumped the TCE in a dry well
;-)

...Jim Thompson
 
G

Guy Macon

Jan 1, 1970
0
John Larkin said:
Why are there no blue ICs? Or red, or orange, or green?
Purple would be nice.

Because black ICs dissapate heat better and run cooler.

Given the trend to colorful motherboards, I expect to see
PC chip sets in colors sometime in the future.
 
S

Spehro Pefhany

Jan 1, 1970
0
The CNY-17 optocoupler package is available in white as an option. I presume
this is not semiconductor designer chic.

What is the purpose for offering this in both white and black packages?

Thanks,

Look at the data sheet: http://www.fairchildsemi.com/ds/CN/CNY17-3.pdf

They have different specs in a number of areas- even the recommended
SMT pad layout is different.


Best regards,
Spehro Pefhany
 
J

John Larkin

Jan 1, 1970
0
It was a muddy looking combination of water, detergent and oil. I
don't remember how we disposed of it; we dumped the TCE in a dry well
;-)

...Jim Thompson


I used to work for this place in New Orleans. I designed a couple
hundred million dollars worth of stuff for them before they fired me
for insubordination. They had their own PCB shop, and disposed of all
the used chemicals through a pipe that went through the wall. That's
as far as it went.

John
 
J

John Popelish

Jan 1, 1970
0
Spehro said:
Look at the data sheet: http://www.fairchildsemi.com/ds/CN/CNY17-3.pdf

They have different specs in a number of areas- even the recommended
SMT pad layout is different.

Woah! Actual information.

Lower capacitance, higher breakdown voltage, slightly lower current
transfer ration (and higher linear resistance versus LED current.
Looks like it has a longer light pipe between emitter and detector.
 
K

K Williams

Jan 1, 1970
0
Sillinessson said:
Only inhaling the *dust* of BeO is harmful. You can eat it to your
heart's content. At Dickson we sawed it under water.

Our chemical safety "experts" found out that HP pulse generators had
chips with BeO substrates some years ago (well the manuals and chassis
had Be warnings on 'em). The CS dweebs just about got HP to bend over
for a quickie, when HP decided to modify the "danger" to a warning for
disposal. Seriously. they were about to rip every pulse generator out
of every lab and test set and ship 'em back with a bill attached.

Silliness really, since the BeO was well encapsulated, and we weren't in
the habit of snorting anything other than coffee, on a bad day.
 
K

Kevin G. Rhoads

Jan 1, 1970
0
don't remember how we disposed of it; we dumped the TCE in a dry well

Y'all been around long enough to know better than to post such stuff, Jim.
Somebody of the gov't buttinskyish persuasion may read it, not see the
smiley, and go ballistic.

THen you is guilty until proven innocent *and* they's no way you can
*prove* yourself innocent.

;-) (OK, that ";-)" makes it all bettter..., right? [;-)] )
 
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