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LM358 alternative
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Raveninghorde
Sep 19, 2011, 9:24:03 AM9/19/11
to
I use the LM358 by the bucket load because they are cheap. I also use
the LM358A for the better offset voltage spec.
I'm always on the look out for an alternative with lower offset that
is still cheap. I've just come across the LM2904A/LM2904AV from TI.
The V version runs at 32V same as the LM358. The offset voltage is
better, 1mV typical compared to 3mV and worst case 2mV as opposed to
7mV for the LM358. Basically the same spec as the LM158A.
They are cheap as well. We pay about $0.07 for the LM358 and these are
$0.09.
Jamie
Sep 19, 2011, 3:41:01 PM9/19/11
to
Raveninghorde wrote:
Not all of us have the luxary to buy at mass volume to get that price!
Jamie
bw
Sep 19, 2011, 6:45:25 PM9/19/11
to
"Raveninghorde" <raveninghorde@invalid> wrote in message
news:n1ge775cjl7a19r9i...@4ax.com...
LM358 and LM2904 are identical except for max voltage allowed. There is a
Fairchild datasheet that covers both. The LM258 has a slightly lower offset.
If you really need lower offset then join the 21st century since about any
modern device will do. Most are now SOIC-8.
A LM358 replacement with better specs would be OPA2277 for just one example.
Fred Bloggs
Sep 19, 2011, 6:54:00 PM9/19/11
to
automotive qualified LM358.
Spehro Pefhany
Sep 19, 2011, 7:01:56 PM9/19/11
to
worth. Not exactly a king's ransom.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
sp...@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
David Eather
Sep 19, 2011, 10:00:28 PM9/19/11
to
On 20/09/2011 9:01 AM, Spehro Pefhany wrote:
> On Mon, 19 Sep 2011 15:41:01 -0400, the renowned Jamie
> <jamie_ka1lpa_not_v...@charter.net> wrote:
>
>> Raveninghorde wrote:
>>
>>> I use the LM358 by the bucket load because they are cheap. I also use
>>> the LM358A for the better offset voltage spec.
>>>
>>> I'm always on the look out for an alternative with lower offset that
>>> is still cheap. I've just come across the LM2904A/LM2904AV from TI.
>>> The V version runs at 32V same as the LM358. The offset voltage is
>>> better, 1mV typical compared to 3mV and worst case 2mV as opposed to
>>> 7mV for the LM358. Basically the same spec as the LM158A.
>>>
>>> They are cheap as well. We pay about $0.07 for the LM358 and these are
>>> $0.09.
>> Not all of us have the luxary to buy at mass volume to get that price!
>>
>> Jamie
>
> You can buy the LM358M for $0.06 apiece if you're willing to buy $150
> worth. Not exactly a king's ransom.
>
>
> Best regards,
> Spehro Pefhany
Who is giving that price? (please, please, please..)
> On Mon, 19 Sep 2011 15:41:01 -0400, the renowned Jamie
> <jamie_ka1lpa_not_v...@charter.net> wrote:
>
>> Raveninghorde wrote:
>>
>>> I use the LM358 by the bucket load because they are cheap. I also use
>>> the LM358A for the better offset voltage spec.
>>>
>>> I'm always on the look out for an alternative with lower offset that
>>> is still cheap. I've just come across the LM2904A/LM2904AV from TI.
>>> The V version runs at 32V same as the LM358. The offset voltage is
>>> better, 1mV typical compared to 3mV and worst case 2mV as opposed to
>>> 7mV for the LM358. Basically the same spec as the LM158A.
>>>
>>> They are cheap as well. We pay about $0.07 for the LM358 and these are
>>> $0.09.
>> Not all of us have the luxary to buy at mass volume to get that price!
>>
>> Jamie
>
> You can buy the LM358M for $0.06 apiece if you're willing to buy $150
> worth. Not exactly a king's ransom.
>
>
> Best regards,
> Spehro Pefhany
dagmarg...@yahoo.com
Sep 20, 2011, 2:23:03 AM9/20/11
to
http://www.ti.com/product/lm358a
The LM2904AV list price was actually higher, $0.21. So, there might
be some negotiation room in both.
http://www.ti.com/product/lm2904v
If you want something gorgeous and totally NOT affordable, consider
the LT1013:
http://www.linear.com/product/LT1013
Vo = 150uV (max), etc.
--
Cheers,
James Arthur
Raveninghorde
Sep 20, 2011, 4:25:49 AM9/20/11
to
On Mon, 19 Sep 2011 17:45:25 -0500, "bw" <bwe...@hotmail.com> wrote:
>
>"Raveninghorde" <raveninghorde@invalid> wrote in message
>news:n1ge775cjl7a19r9i...@4ax.com...
>>
>> I use the LM358 by the bucket load because they are cheap. I also use
>> the LM358A for the better offset voltage spec.
>>
>> I'm always on the look out for an alternative with lower offset that
>> is still cheap. I've just come across the LM2904A/LM2904AV from TI.
>> The V version runs at 32V same as the LM358. The offset voltage is
>> better, 1mV typical compared to 3mV and worst case 2mV as opposed to
>> 7mV for the LM358. Basically the same spec as the LM158A.
>>
>> They are cheap as well. We pay about $0.07 for the LM358 and these are
>> $0.09.
>
>For the price, the LM358 is likely the best.
>LM358 and LM2904 are identical except for max voltage allowed. There is a
>Fairchild datasheet that covers both. The LM258 has a slightly lower offset.
As I stated TI do better versions of the LM2904:
>
>"Raveninghorde" <raveninghorde@invalid> wrote in message
>news:n1ge775cjl7a19r9i...@4ax.com...
>>
>> I use the LM358 by the bucket load because they are cheap. I also use
>> the LM358A for the better offset voltage spec.
>>
>> I'm always on the look out for an alternative with lower offset that
>> is still cheap. I've just come across the LM2904A/LM2904AV from TI.
>> The V version runs at 32V same as the LM358. The offset voltage is
>> better, 1mV typical compared to 3mV and worst case 2mV as opposed to
>> 7mV for the LM358. Basically the same spec as the LM158A.
>>
>> They are cheap as well. We pay about $0.07 for the LM358 and these are
>> $0.09.
>
>For the price, the LM358 is likely the best.
>LM358 and LM2904 are identical except for max voltage allowed. There is a
>Fairchild datasheet that covers both. The LM258 has a slightly lower offset.
http://www.ti.com/lit/ds/symlink/lm2904-q1.pdf
>If you really need lower offset then join the 21st century since about any
>modern device will do. Most are now SOIC-8.
>A LM358 replacement with better specs would be OPA2277 for just one example.
>
lot of applications.
You're forgeting the definition of engineering. An engineer does for a
dime what any idiot can do for a dollar.
Spehro Pefhany
Sep 20, 2011, 8:22:01 AM9/20/11
to
k...@att.bizzzzzzzzzzzz
Sep 20, 2011, 11:10:07 AM9/20/11
to
Can you be sure of what you're buying?
Spehro Pefhany
Sep 20, 2011, 12:00:23 PM9/20/11
to
worth of Fairchild optos) was okay.
David Eather
Sep 20, 2011, 12:03:39 PM9/20/11
to
k...@att.bizzzzzzzzzzzz
Sep 20, 2011, 1:41:53 PM9/20/11
to
On Tue, 20 Sep 2011 12:00:23 -0400, Spehro Pefhany
A reel of floor-sweepings can ruin your whole day.
Spehro Pefhany
Sep 20, 2011, 2:06:20 PM9/20/11
to
On Tue, 20 Sep 2011 12:41:53 -0500, "k...@att.bizzzzzzzzzzzz"
BTDTGTTS. 8-( And dealing with Chinese and other offshore sources can
ruin more than your day. Counterfeits, old parts, deliberately mixed
wrong parts, etc. etc. I once got a shipment of PCB-mount fuseholders
from Taiwan that literally had scrap metal floor sweepings added the
bag to make up the weight.
AFAIK, those guys are legit. Here's their line card:
http://www.masterdistributors.com/md_linecard.pdf
Anybody else deal with them?
ruin more than your day. Counterfeits, old parts, deliberately mixed
wrong parts, etc. etc. I once got a shipment of PCB-mount fuseholders
from Taiwan that literally had scrap metal floor sweepings added the
bag to make up the weight.
AFAIK, those guys are legit. Here's their line card:
http://www.masterdistributors.com/md_linecard.pdf
Anybody else deal with them?
Jan Panteltje
Sep 20, 2011, 2:50:47 PM9/20/11
to
On a sunny day (Tue, 20 Sep 2011 14:06:20 -0400) it happened Spehro Pefhany
<spef...@interlogDOTyou.knowwhat> wrote in
<n6lh7717a5jk4bslt...@4ax.com>:
>BTDTGTTS. 8-( And dealing with Chinese and other offshore sources can
>ruin more than your day. Counterfeits, old parts, deliberately mixed
>wrong parts, etc. etc. I once got a shipment of PCB-mount fuseholders
>from Taiwan that literally had scrap metal floor sweepings added the
>bag to make up the weight.
OTOH I just got some beautiful graphics LCDs from China.
Blue dots on white backlight.
But expensive.
Wired it up, the backlight is so bright that I switched it of again,
have to read that datasheet again, maybe I am putting in too much
current in the LED backlight, +5 - 75 Ohm - LCD - ground.
??? White LEDs getting better too?
Drops 1.56 V over 75 Ohm makes 20 mA???
The green ones need > 300mA for this sort of brightness.
Good stuff.
http://www.ebay.com/itm/Graphic-Matrix-LCD-Module-LCM-Display-12864-128X64-/190466776198?pt=LH_DefaultDomain_0&hash=item2c58b45c
Ordered Sept 12, dropped in the mailbox today Sept 20.
I am impressed.
<spef...@interlogDOTyou.knowwhat> wrote in
<n6lh7717a5jk4bslt...@4ax.com>:
>BTDTGTTS. 8-( And dealing with Chinese and other offshore sources can
>ruin more than your day. Counterfeits, old parts, deliberately mixed
>wrong parts, etc. etc. I once got a shipment of PCB-mount fuseholders
>from Taiwan that literally had scrap metal floor sweepings added the
>bag to make up the weight.
Blue dots on white backlight.
But expensive.
Wired it up, the backlight is so bright that I switched it of again,
have to read that datasheet again, maybe I am putting in too much
current in the LED backlight, +5 - 75 Ohm - LCD - ground.
??? White LEDs getting better too?
Drops 1.56 V over 75 Ohm makes 20 mA???
The green ones need > 300mA for this sort of brightness.
Good stuff.
http://www.ebay.com/itm/Graphic-Matrix-LCD-Module-LCM-Display-12864-128X64-/190466776198?pt=LH_DefaultDomain_0&hash=item2c58b45c
Ordered Sept 12, dropped in the mailbox today Sept 20.
I am impressed.
Jamie
Sep 20, 2011, 6:20:45 PM9/20/11
to
Jamie
Jamie
Sep 20, 2011, 6:21:47 PM9/20/11
to
Jamie
Spehro Pefhany
Sep 20, 2011, 9:09:55 PM9/20/11
to
(crappy) op-amps in one package. Often under a dime in moderate
quantity.
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