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Science Forum Index » Electronics - Components Forum » OPA4227, why out of stock so much?
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| Joerg |
 Posted: Tue Feb 27, 2007 9:50 pm |
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Usually I can get by with jelly bean amps but not this time. Offset
should be well under 1mV but most of all the input noise must be under
5nV/sqrtHz. Supplies +/-15V, TSSOP or SOIC, quad package. The OPA4227
fits the bill nicely with plenty of margin. Then came the awakening: Out
of stock at Digikey and Mouser. Same for its faster brother, the
OPA4228. Big red flags went up.
Could the OPA4227 be falling from grace for some reason? If you know
what replaces it I'd appreciate a hint. I am looking around myself now
but want to pick something that's going to be around for a couple of
decades.
--
Regards, Joerg
http://www.analogconsultants.com |
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| Joerg |
| Posted: Tue Feb 27, 2007 10:19 pm |
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Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
--
Regards, Joerg
http://www.analogconsultants.com |
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| Uwe Bonnes |
| Posted: Wed Feb 28, 2007 2:21 am |
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In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net> wrote:
Quote: Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page
as "no thrills"? Now they want me to download some flash thing, that I have
always to deny by clicking when entering their site.
Reg. TI: rumors are that a lot of BB products where moved to an asian site
and bigger wafers and to a different test site. It seems that things didn't
go that smooth as expected. Look at the lead times of the ADS8344
e.g. Constantly "26 weeks" since last august. INA114 isn't better, and so a
lot of other chips...
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ---------- |
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| Joerg |
| Posted: Wed Feb 28, 2007 2:41 pm |
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Uwe Bonnes wrote:
Quote: In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net> wrote:
Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page
as "no thrills"? Now they want me to download some flash thing, that I have
always to deny by clicking when entering their site.
IMHO they seriously messed up their site. Ok, the flash gimmick can be
ignored. It's just one extra and unnecessary click. But now I frequently
encounter a blank page when trying to dive into detailed product
listings, repeatedly. After 2-3 times I move on to a competitor. Since
their, ahem, "web site enhancement" I have not designed in one single
National part. That was very different before. Maybe it's just me but
the truth cometh onto the table with their next quarterly financials.
And no, I will not take the typical web kiddie excuse that I have an
incompatble browser. A site that only works with a select few browsers
is IMHO a poor job.
Quote: Reg. TI: rumors are that a lot of BB products where moved to an asian site
and bigger wafers and to a different test site. It seems that things didn't
go that smooth as expected. Look at the lead times of the ADS8344
e.g. Constantly "26 weeks" since last august. INA114 isn't better, and so a
lot of other chips...
That has me concerned as well. It would basically leave AD and LTC as
the contenders and their products tend to be high cost. Not that I find
them overpriced in any way, it's just that I don't usually need the
extremely low offset voltages they offer. It is like buying a Porsche in
the US where you can't drive faster than 65mph anyways. Yep, I sometimes
miss your autobahns.
--
Regards, Joerg
http://www.analogconsultants.com |
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| Rich Grise |
| Posted: Wed Feb 28, 2007 11:00 pm |
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On Wed, 28 Feb 2007 12:21:24 +0000, Uwe Bonnes wrote:
Quote: In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net> wrote:
Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page ...
I remember when the National data books were like the Holy Grail of data
books. Vendors used to have a "literature room", where you could just walk
in and help yourself to any data books they had - the Nationals were
always picked clean when the slow guys got there. :-)
I was working in Orange County, CA at the time and was almost within
walking distance of Arrow, Future, Newark, and a bunch of other vendors -
Everyone had a shelf full of data books. Nowadays, they don't even _print_
them any more! )-;
Cheers!
Rich |
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| Eeyore |
| Posted: Thu Mar 01, 2007 12:52 am |
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Rich Grise wrote:
Quote: Uwe Bonnes wrote:
Joerg <notthisjoergsch@removethispacbell.net> wrote:
Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page ...
I remember when the National data books were like the Holy Grail of data
books. Vendors used to have a "literature room", where you could just walk
in and help yourself to any data books they had - the Nationals were
always picked clean when the slow guys got there. :-)
I was working in Orange County, CA at the time and was almost within
walking distance of Arrow, Future, Newark, and a bunch of other vendors -
Everyone had a shelf full of data books. Nowadays, they don't even _print_
them any more! )-;
Well..... the Nat Semi Audio Handbook finally got reprinted.
Graham |
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| Guest |
| Posted: Thu Mar 01, 2007 12:26 pm |
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this is exactly what will happen to the remainder of our technical dtabases
also.
as this stuff evolves ever more quickly, they just cant spend
time/money/trees to put it all into hard copy! (at least not for public
distribution)
some legislation (omigod!) should be initiated to help (FORCE) the
brilliant minds to deposit at least a copy of their works into soem majestic
government vaulted room filled with currently useable data storage devices.
a duplicate room would be created every say 5 years with new technology and
the first room's data replicated into the new media.
otherwise, the lack of continuity from genereation to generation will be
fragmented at best.
so, who knows where to find a lenticular refractor lense for a 1740
duGenereaux magnification device? or what the curvature and specs are? or
even if they existed?.....
"Rich Grise" <rich@example.net> wrote in message
news:pan.2007.03.01.03.00.31.565488@example.net...
Quote: On Wed, 28 Feb 2007 12:21:24 +0000, Uwe Bonnes wrote:
In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net
wrote:
Might add one here that can work: AD8674. In stock but rather
expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page ...
I remember when the National data books were like the Holy Grail of data
books. Vendors used to have a "literature room", where you could just walk
in and help yourself to any data books they had - the Nationals were
always picked clean when the slow guys got there. :-)
I was working in Orange County, CA at the time and was almost within
walking distance of Arrow, Future, Newark, and a bunch of other vendors -
Everyone had a shelf full of data books. Nowadays, they don't even _print_
them any more! )-;
Cheers!
Rich
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| Joerg |
| Posted: Thu Mar 01, 2007 2:27 pm |
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Guest
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Rich Grise wrote:
Quote: On Wed, 28 Feb 2007 12:21:24 +0000, Uwe Bonnes wrote:
In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net> wrote:
Might add one here that can work: AD8674. In stock but rather expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page ...
I remember when the National data books were like the Holy Grail of data
books. Vendors used to have a "literature room", where you could just walk
in and help yourself to any data books they had - the Nationals were
always picked clean when the slow guys got there. :-)
And that is why those are on this here shelf and will remain there until
the slide rule falls out of my hands. Then, hopefully, they'll migrate
into the hands of another engineer. The web clearly is not a reliable
replacement for databooks. Nor is it fast enough the way most semi mfgs
have "organized" their sites.
Yesterday I was picking parts out of a well worn 2003 TI selection
guide. Much faster than online.
Quote: I was working in Orange County, CA at the time and was almost within
walking distance of Arrow, Future, Newark, and a bunch of other vendors -
Everyone had a shelf full of data books. Nowadays, they don't even _print_
them any more! )-;
Some, like TI, have a service where you pay the printing and shipping
costs and then they'll have one printed up and sent out to you. Makes
perfect sense to me. Many moons from now other companies might realize
how practical that is. Or maybe they don't.
In the same way lots of people have (finally) come to realize that their
newfangled PDAs aren't all that useful and are going back to, gasp,
daytimers. I've always stayed with my daytimer because it works.
--
Regards, Joerg
http://www.analogconsultants.com |
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| Guest |
| Posted: Sat Mar 17, 2007 8:38 am |
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yes, the extra steps, power, intelligence and technique required to "improve
on reading" via these gadgets has me befuddled.
how did we all get sold this amazingly in-efficient techno-baloney anyway?
is it just another "toy for grownups?"
me thinks the Occam Razor solutions are the best way, never confound
straight forward remedies with yet other confounding remedies!
"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:vWEFh.590$8i6.408@newssvr29.news.prodigy.net...
Quote: Rich Grise wrote:
On Wed, 28 Feb 2007 12:21:24 +0000, Uwe Bonnes wrote:
In sci.electronics.design Joerg <notthisjoergsch@removethispacbell.net
wrote:
Might add one here that can work: AD8674. In stock but rather
expensive.
Around $4. Ouch.
The only guys I didn't try was National. Their web site repeatedly
pulled a blank after narrowing down the opamp selection. They really
messed up their site, big time. Anybody listening at National? I guess
not...
Do you remember when the National Guys advertised the web page ...
I remember when the National data books were like the Holy Grail of data
books. Vendors used to have a "literature room", where you could just
walk
in and help yourself to any data books they had - the Nationals were
always picked clean when the slow guys got there. :-)
And that is why those are on this here shelf and will remain there until
the slide rule falls out of my hands. Then, hopefully, they'll migrate
into the hands of another engineer. The web clearly is not a reliable
replacement for databooks. Nor is it fast enough the way most semi mfgs
have "organized" their sites.
Yesterday I was picking parts out of a well worn 2003 TI selection
guide. Much faster than online.
I was working in Orange County, CA at the time and was almost within
walking distance of Arrow, Future, Newark, and a bunch of other
vendors -
Everyone had a shelf full of data books. Nowadays, they don't even
_print_
them any more! )-;
Some, like TI, have a service where you pay the printing and shipping
costs and then they'll have one printed up and sent out to you. Makes
perfect sense to me. Many moons from now other companies might realize
how practical that is. Or maybe they don't.
In the same way lots of people have (finally) come to realize that their
newfangled PDAs aren't all that useful and are going back to, gasp,
daytimers. I've always stayed with my daytimer because it works.
--
Regards, Joerg
http://www.analogconsultants.com |
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