OP-61 Replacement Op Amp...

[Spencer H]

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer

 

[John Larkin]

On Wed, 22 Feb 2023 07:00:45 -0500, Steve Goldstein
<sgoldHAM@alum.mit.edu> wrote:

On Tue, 21 Feb 2023 09:04:49 -0800, John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote:

On Tue, 21 Feb 2023 08:00:32 -0500, Steve Goldstein
sgoldHAM@alum.mit.edu> wrote:

On Mon, 20 Feb 2023 10:09:38 -0800 (PST), Spencer H
spencerphaney@gmail.com> wrote:


It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

There are multiple reasons parts are obsoleted. Post-acquisition
product line duplication is certainly one, but not the only one by a
long measure.

Fabs are expensive things to run. Depending on the process, wafers
can cost from hundreds to many thousands of dollars each. Companies
look at the revenue per wafer. A product that\'s filling up the fab
but not making much profit is not going to survive long. Same with a
low-selling product that requires one wafer lot per many years - there
are costs associated with holding inventory.

Another concern is equipment and supply obsolescence. Not many
companies are running 4\" silicon wafer fabs these days (are any?) The
equipment is obsolete and unmaintainable, and I\'m not even sure wafers
are available. So if company A purchases smaller company B, and B is
using end-of-life equipment, B\'s low-running products are unlikely to
get transferred to a newer fab process as there are very large costs
is making such a transfer. Even within the same fab, a newer process
may supplant an older one and it may not be worth the expense to
migrate low-runners to the newer process.

Companies generally announce a product\'s demise and offer lifetime
buys to their customers. Big customers will get individual
notifications, the smaller ones have to constantly be on alert for
this information.

Produce obsolescence is unavoidable. Technology evolves and markets
change. The buggy-whip industry isn\'t what it once was, and Ford is no
longer making the Model T. Nor is Intel making the 8080 or 80286.

\"That\'s a Burr-Brown part, nobody knows anything about it.\"


That\'s an issue born of normal retirements, layoffs, internal
transfers, job changes to other companies, and early retirements
(buyouts). The cost of supporting something \"forever\" are very high.

In this particular case, BB was acquired by TI 22.5 years ago. Their
processes and equipment were older than that.

TI is about the best at keeping old parts in production. I wonder what
they do about test sets.

Maxim was the worst. They would discontinue parts at the sampling
stage. There were part numbers that the people wouldn\'t even admit to.
We learned about EOL on MAX9690 when the parts never showed up. Maybe
ADI will run things better.

I haven\'t seen many Richardson parts lately. Is there a story?

 

[Piglet]

On 22/02/2023 15:39, John Larkin wrote:

I haven\'t seen many Richardson parts lately. Is there a story?

Richardson or Rochester?

piglet

 

[John Larkin]

On Wed, 22 Feb 2023 16:37:37 +0000, Piglet <erichpwagner@hotmail.com>
wrote:

On 22/02/2023 15:39, John Larkin wrote:

I haven\'t seen many Richardson parts lately. Is there a story?


Richardson or Rochester?

piglet

Rochester I guess. They bought old wafers and maybe masks to keep
parts alive. I used to see them on Digikey a lot.

Richardson is an RF parts distributor.

 

[Spencer H]

On Thursday, February 16, 2023 at 7:55:59 AM UTC-5, John Walliker wrote:

On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:
On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?
The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John

Thanks all, I\'m looking lower level than the SFP modules, but thanks for your comments.

 

[Spencer H]

On Saturday, February 18, 2023 at 6:55:17 PM UTC-5, Tabby wrote:

On Thursday, 16 February 2023 at 02:10:59 UTC, Spencer H wrote:
Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
if you\'re only building one...
https://www.ebay.co.uk/itm/175569648545

Thanks for the suggestions all... This is my first time designing a front end for a digital system, so I\'m still trying to figure out what \'analog\' considerations I can forgo. In the digital world, I think I need to worry less about input current noise since I will quantize the output, but that doesn\'t seem to get me much in terms of broader amplifier selection.

I\'m looking at the OPA856, built for Lidar applications. <https://www.ti.com/product/OPA856#order-quality>

It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

 

[Dimiter_Popoff]

On 2/20/2023 20:09, Spencer H wrote:

On Saturday, February 18, 2023 at 6:55:17 PM UTC-5, Tabby wrote:
On Thursday, 16 February 2023 at 02:10:59 UTC, Spencer H wrote:
Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
if you\'re only building one...
https://www.ebay.co.uk/itm/175569648545

Thanks for the suggestions all... This is my first time designing a front end for a digital system, so I\'m still trying to figure out what \'analog\' considerations I can forgo. In the digital world, I think I need to worry less about input current noise since I will quantize the output, but that doesn\'t seem to get me much in terms of broader amplifier selection.

I\'m looking at the OPA856, built for Lidar applications. <https://www.ti.com/product/OPA856#order-quality

It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

That one sure looks good bet there are also many others with up to 5V
supply which will do.
The one you initially considered is a +/-15V part.

I don\'t have many complaints about Analog obsoleting their parts,
I can still get opamps I designed with 30+ years ago. Anything
has a limited lifetime of course.

 

[John Walliker]

On Friday, 17 February 2023 at 22:04:01 UTC, Spencer H wrote:

On Thursday, February 16, 2023 at 7:55:59 AM UTC-5, John Walliker wrote:
On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:
On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?
The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John
Thanks all, I\'m looking lower level than the SFP modules, but thanks for your comments.

What do you actually mean by \"lower level\"? Power, complexity or
something completely different?
Are you using fibre or free space?
If fibre is it glass or plastic?
What distance?
Without knowing what you are actually trying to do it is very difficult to
offer useful help.
John

 

[Phil Hobbs]

On 2023-02-22 12:07, John Larkin wrote:

On Wed, 22 Feb 2023 16:37:37 +0000, Piglet <erichpwagner@hotmail.com
wrote:

On 22/02/2023 15:39, John Larkin wrote:

I haven\'t seen many Richardson parts lately. Is there a story?


Richardson or Rochester?

piglet

Rochester I guess. They bought old wafers and maybe masks to keep
parts alive. I used to see them on Digikey a lot.

Richardson is an RF parts distributor.

Rochester keeps coming up in Digikey searches for me. It\'s a bit
irritating really--there\'s a $300 line item minimum for everything they
sell.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Phil Hobbs]

On 2023-02-20 13:09, Spencer H wrote:

On Saturday, February 18, 2023 at 6:55:17 PM UTC-5, Tabby wrote:
On Thursday, 16 February 2023 at 02:10:59 UTC, Spencer H wrote:
Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
if you\'re only building one...
https://www.ebay.co.uk/itm/175569648545

Thanks for the suggestions all... This is my first time designing a front end for a digital system, so I\'m still trying to figure out what \'analog\' considerations I can forgo. In the digital world, I think I need to worry less about input current noise since I will quantize the output, but that doesn\'t seem to get me much in terms of broader amplifier selection.

I\'m looking at the OPA856, built for Lidar applications. <https://www.ti.com/product/OPA856#order-quality

It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

The OP-61 is in my 1990 PMI databook. (PMI used to write _beautiful_
datasheets.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Ricky]

On Friday, February 17, 2023 at 6:25:45 PM UTC-5, John Walliker wrote:

On Friday, 17 February 2023 at 22:04:01 UTC, Spencer H wrote:
On Thursday, February 16, 2023 at 7:55:59 AM UTC-5, John Walliker wrote:
On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:
On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?
The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John
Thanks all, I\'m looking lower level than the SFP modules, but thanks for your comments.
What do you actually mean by \"lower level\"? Power, complexity or
something completely different?
Are you using fibre or free space?
If fibre is it glass or plastic?
What distance?
Without knowing what you are actually trying to do it is very difficult to
offer useful help.
John

I think that\'s an equivalent statement to, \"I don\'t know\". I don\'t get why people make things hard by asking questions that would only matter if you were going to change the design. The guy asked for an op amp replacement. That seems pretty clear to me.

If you want to know more of the details that are important, that would be reasonable to ask. What band width is required? What input current is acceptable, etc...

So Spencer, what are the important specs of the op amp for your design? I\'m not familiar with TIA circuits, unless you mean transient ischemic attack, which I highly doubt.

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

 

[John Larkin]

On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
<spencerphaney@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer

Have you considered buying an SFP module?

 

[Dimiter_Popoff]

On 2/18/2023 18:09, Ricky wrote:

On Friday, February 17, 2023 at 6:25:45 PM UTC-5, John Walliker wrote:
On Friday, 17 February 2023 at 22:04:01 UTC, Spencer H wrote:
On Thursday, February 16, 2023 at 7:55:59 AM UTC-5, John Walliker wrote:
On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:
On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?
The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John
Thanks all, I\'m looking lower level than the SFP modules, but thanks for your comments.
What do you actually mean by \"lower level\"? Power, complexity or
something completely different?
Are you using fibre or free space?
If fibre is it glass or plastic?
What distance?
Without knowing what you are actually trying to do it is very difficult to
offer useful help.
John

I think that\'s an equivalent statement to, \"I don\'t know\". I don\'t get why people make things hard by asking questions that would only matter if you were going to change the design. The guy asked for an op amp replacement. That seems pretty clear to me.

If you want to know more of the details that are important, that would be reasonable to ask. What band width is required? What input current is acceptable, etc...

So Spencer, what are the important specs of the op amp for your design? I\'m not familiar with TIA circuits, unless you mean transient ischemic attack, which I highly doubt.

Not at all. Lower level means lower level, anyone doing design work
knows what it means.
And the guy has been quite clear what he needs - a replacement for the
OP-61. Last night I did look at the parts I have used and I saw none
which would be a direct replacement, it would take some real work for
me to find one which I don\'t have the time for.

Spencer, the closest I can suggest it an AD829 *but* it settles to
only 0.1% rather than 0.01 and it has about 10 times the input current.
Has been good for me for many years, but probably not good enough for
you.
The OPA637 comes sort of close but is slower to settle to 0.01%.
I vaguely remember some current feedback parts, AD846 or something,
but I am not sure if that one was in the ballpark you need, apart
from not knowing if a current feedback part is usable in this case
at all. And I have only played with it, not used it (unlike the
other two I mentioned).

======================================================
Dimiter Popoff, TGI http://www.tgi-sci.com
======================================================
http://www.flickr.com/photos/didi_tgi/

 

[John Walliker]

On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:

On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage.. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?

The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John

 

[bitrex]

On 2/18/2023 11:20 AM, Dimiter_Popoff wrote:

On 2/18/2023 18:09, Ricky wrote:
On Friday, February 17, 2023 at 6:25:45 PM UTC-5, John Walliker wrote:
On Friday, 17 February 2023 at 22:04:01 UTC, Spencer H wrote:
On Thursday, February 16, 2023 at 7:55:59 AM UTC-5, John Walliker
wrote:
On Thursday, 16 February 2023 at 02:55:16 UTC, John Larkin wrote:
On Wed, 15 Feb 2023 18:10:53 -0800 (PST), Spencer H
spence...@gmail.com> wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance
stages for an optical communication link running <200Mbd.
Unfortunately many of the parts used in application notes etc for
this link speed are discontinued, and there isn\'t so many direct
replacements out there.

In particular I\'m looking for a replacement for OP-61, for the
TIA stage. Any ideas?

Thanks,
Spencer
Have you considered buying an SFP module?
The OP doesn\'t say whether it is free-space or fibre. If its fibre,
then SFPs are incredibly cheap for a lot of convenience.

John
Thanks all, I\'m looking lower level than the SFP modules, but thanks
for your comments.
What do you actually mean by \"lower level\"? Power, complexity or
something completely different?
Are you using fibre or free space?
If fibre is it glass or plastic?
What distance?
Without knowing what you are actually trying to do it is very
difficult to
offer useful help.
John

I think that\'s an equivalent statement to, \"I don\'t know\".  I don\'t
get why people make things hard by asking questions that would only
matter if you were going to change the design.  The guy asked for an
op amp replacement.  That seems pretty clear to me.

If you want to know more of the details that are important, that would
be reasonable to ask.  What band width is required?  What input
current is acceptable, etc...

So Spencer, what are the important specs of the op amp for your
design?  I\'m not familiar with TIA circuits, unless you mean transient
ischemic attack, which I highly doubt.



Not at all. Lower level means lower level, anyone doing design work
knows what it means.
And the guy has been quite clear what he needs - a replacement for the
OP-61. Last night I did look at the parts I have used and I saw none
which would be a direct replacement, it would take some real work for
me to find one which I don\'t have the time for.

Spencer, the closest I can suggest it an AD829 *but* it settles to
only 0.1% rather than 0.01 and it has about 10 times the input current.
Has been good for me for many years, but probably not good enough for
you.
The OPA637 comes sort of close but is slower to settle to 0.01%.
I vaguely remember some current feedback parts, AD846 or something,
but I am not sure if that one was in the ballpark you need, apart
from not knowing if a current feedback part is usable in this case
at all. And I have only played with it, not used it (unlike the
other two I mentioned).

LT1222 looks like it might be a good replacement, availability isn\'t
fantastic but likely better than the OP-61:

<https://octopart.com/search?q=LT1222&currency=USD&specs=0>

<https://www.mouser.com/datasheet/2/609/1222fc-2953689.pdf>

======================================================
Dimiter Popoff, TGI             http://www.tgi-sci.com
======================================================
http://www.flickr.com/photos/didi_tgi/

 

[Tabby]

On Thursday, 16 February 2023 at 02:10:59 UTC, Spencer H wrote:

Hi All,

I am new to the group, thanks in advance for your comments.

I\'m in the process of designing transconductance/transimpedance stages for an optical communication link running <200Mbd. Unfortunately many of the parts used in application notes etc for this link speed are discontinued, and there isn\'t so many direct replacements out there.

In particular I\'m looking for a replacement for OP-61, for the TIA stage. Any ideas?

Thanks,
Spencer

if you\'re only building one...
https://www.ebay.co.uk/itm/175569648545

 

[Steve Goldstein]

On Mon, 20 Feb 2023 10:09:38 -0800 (PST), Spencer H
<spencerphaney@gmail.com> wrote:

It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

There are multiple reasons parts are obsoleted. Post-acquisition
product line duplication is certainly one, but not the only one by a
long measure.

Fabs are expensive things to run. Depending on the process, wafers
can cost from hundreds to many thousands of dollars each. Companies
look at the revenue per wafer. A product that\'s filling up the fab
but not making much profit is not going to survive long. Same with a
low-selling product that requires one wafer lot per many years - there
are costs associated with holding inventory.

Another concern is equipment and supply obsolescence. Not many
companies are running 4\" silicon wafer fabs these days (are any?) The
equipment is obsolete and unmaintainable, and I\'m not even sure wafers
are available. So if company A purchases smaller company B, and B is
using end-of-life equipment, B\'s low-running products are unlikely to
get transferred to a newer fab process as there are very large costs
is making such a transfer. Even within the same fab, a newer process
may supplant an older one and it may not be worth the expense to
migrate low-runners to the newer process.

Companies generally announce a product\'s demise and offer lifetime
buys to their customers. Big customers will get individual
notifications, the smaller ones have to constantly be on alert for
this information.

Produce obsolescence is unavoidable. Technology evolves and markets
change. The buggy-whip industry isn\'t what it once was, and Ford is no
longer making the Model T. Nor is Intel making the 8080 or 80286.

 

[John Larkin]

On Tue, 21 Feb 2023 08:00:32 -0500, Steve Goldstein
<sgoldHAM@alum.mit.edu> wrote:

On Mon, 20 Feb 2023 10:09:38 -0800 (PST), Spencer H
spencerphaney@gmail.com> wrote:


It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

There are multiple reasons parts are obsoleted. Post-acquisition
product line duplication is certainly one, but not the only one by a
long measure.

Fabs are expensive things to run. Depending on the process, wafers
can cost from hundreds to many thousands of dollars each. Companies
look at the revenue per wafer. A product that\'s filling up the fab
but not making much profit is not going to survive long. Same with a
low-selling product that requires one wafer lot per many years - there
are costs associated with holding inventory.

Another concern is equipment and supply obsolescence. Not many
companies are running 4\" silicon wafer fabs these days (are any?) The
equipment is obsolete and unmaintainable, and I\'m not even sure wafers
are available. So if company A purchases smaller company B, and B is
using end-of-life equipment, B\'s low-running products are unlikely to
get transferred to a newer fab process as there are very large costs
is making such a transfer. Even within the same fab, a newer process
may supplant an older one and it may not be worth the expense to
migrate low-runners to the newer process.

Companies generally announce a product\'s demise and offer lifetime
buys to their customers. Big customers will get individual
notifications, the smaller ones have to constantly be on alert for
this information.

Produce obsolescence is unavoidable. Technology evolves and markets
change. The buggy-whip industry isn\'t what it once was, and Ford is no
longer making the Model T. Nor is Intel making the 8080 or 80286.

\"That\'s a Burr-Brown part, nobody knows anything about it.\"

 

[Steve Goldstein]

On Tue, 21 Feb 2023 09:04:49 -0800, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:

On Tue, 21 Feb 2023 08:00:32 -0500, Steve Goldstein
sgoldHAM@alum.mit.edu> wrote:

On Mon, 20 Feb 2023 10:09:38 -0800 (PST), Spencer H
spencerphaney@gmail.com> wrote:


It always seems a crime to me that the parts >10 years old all fall into obsolescence... Especially from the companies bought by TI, ADI. It can\'t be a coincidence that all the BB/LT/etc parts are the first to go and with no replacements.. Do they discontinue the parts because they want us to buy their fully kitted modules, or is there really just no market?

Thanks again,
Spencer

There are multiple reasons parts are obsoleted. Post-acquisition
product line duplication is certainly one, but not the only one by a
long measure.

Fabs are expensive things to run. Depending on the process, wafers
can cost from hundreds to many thousands of dollars each. Companies
look at the revenue per wafer. A product that\'s filling up the fab
but not making much profit is not going to survive long. Same with a
low-selling product that requires one wafer lot per many years - there
are costs associated with holding inventory.

Another concern is equipment and supply obsolescence. Not many
companies are running 4\" silicon wafer fabs these days (are any?) The
equipment is obsolete and unmaintainable, and I\'m not even sure wafers
are available. So if company A purchases smaller company B, and B is
using end-of-life equipment, B\'s low-running products are unlikely to
get transferred to a newer fab process as there are very large costs
is making such a transfer. Even within the same fab, a newer process
may supplant an older one and it may not be worth the expense to
migrate low-runners to the newer process.

Companies generally announce a product\'s demise and offer lifetime
buys to their customers. Big customers will get individual
notifications, the smaller ones have to constantly be on alert for
this information.

Produce obsolescence is unavoidable. Technology evolves and markets
change. The buggy-whip industry isn\'t what it once was, and Ford is no
longer making the Model T. Nor is Intel making the 8080 or 80286.

\"That\'s a Burr-Brown part, nobody knows anything about it.\"

That\'s an issue born of normal retirements, layoffs, internal
transfers, job changes to other companies, and early retirements
(buyouts). The cost of supporting something \"forever\" are very high.

In this particular case, BB was acquired by TI 22.5 years ago. Their
processes and equipment were older than that.

 

[sibolis jahanamnaburju]

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