LM310/LM110 - need a replacement

Jim Flanagan

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Nov 7, 2009, 4:22:42 PM11/7/09

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I need a replacement for this device in an 8pin dip package. Does
anyone have an extra
they want to sell or barter? These a unity gain, Jfet, buffers. Mine
is being used in a sample
and hold circuit that bit the dust. I'm trying to not have to kludge a fix.

Thanks
Jim

Jamie

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Nov 7, 2009, 5:28:13 PM11/7/09

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Jim Flanagan wrote:

If I think of, I'll bring a couple home monday. I'm sure we have spares
since we have boards that use them.

David Eather

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Nov 7, 2009, 5:36:39 PM11/7/09

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It looks like (you better check if you use this idea) that an TL071
(jfet inputs) would slot in very well if you can live with the reduced
bandwidth (3MHz vs 20MHz) and slew rate (13V/uS vs 40V/us)

Dave M

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Nov 7, 2009, 6:48:40 PM11/7/09

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Unicorn Electronics has the LM310N in stock at
http://www.unicornelectronics.com/IC/LINEAR.html. They have a $25.00
minimum, but they ship quickly. Have ordered many times from Unicorn with
excellent service.
Consolidated also lists them as being in stock at
http://www.ceitron.com/semi/semi.phtml?part=LM310. They have a $25.00
minimum as well.

--
David
masondg44 at comcast dot net

Jamie

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Nov 7, 2009, 7:24:27 PM11/7/09

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Dave M wrote:

Nice to know about that site, I noticed they're not cheap!

I also noticed they have some LM377N which I have a crap load
of from years ago :)
I used them not for audio but for small servo to run little
DC motors in a bridge mode.
Maybe I can offer to sell them! :)

Phil Allison

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Nov 7, 2009, 7:12:35 PM11/7/09

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"Jim Flanagan"

>
> I need a replacement for this device in an 8pin dip package. Does
> anyone have an extra they want to sell or barter?
>
> These a unity gain, Jfet, buffers.

** Better take a look at a data sheet.

The LM310 is not jfet.

..... Phil

Jim Flanagan

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Nov 7, 2009, 11:27:43 PM11/7/09

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Yes... you are quite right. Not sure where I got 'JFET' input from?
Thanks
>
>

Phil Allison

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Nov 8, 2009, 12:58:08 AM11/8/09

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"Jim Flanagan"

> Phil Allison wrote:
>
>>
>>> I need a replacement for this device in an 8pin dip package. Does
>>> anyone have an extra they want to sell or barter?
>>>
>>> These a unity gain, Jfet, buffers.
>>>
>> ** Better take a look at a data sheet.
>>
>> The LM310 is not jfet.
>>
>

> Yes... you are quite right. Not sure where I got 'JFET' input from?

** 1nA input bias current gives one that sort of impression.

Seems to be using the same "super gain" NPN transistors for the inputs as
the LM308 does.

Amazing stuff for ICs released in the late 1960s.

..... Phil

Bill Sloman

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Nov 8, 2009, 1:51:53 PM11/8/09

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Bob Widlar was amazing.

http://jove.eng.yale.edu/pipermail/eas-info/2003/000440.html

--
Bill Sloman, Nijmegen

JW

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Nov 9, 2009, 5:51:07 AM11/9/09

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On Sat, 07 Nov 2009 16:22:42 -0500 Jim Flanagan <jf...@tampabay.rr.com>
wrote in Message id: <4af5e523$0$4967$9a6e...@unlimited.newshosting.com>:

NTE crossrefs to a NTE924
http://www.nteinc.com/

$15 at Mouser (ouch)

Rich Grise

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Nov 9, 2009, 4:08:36 PM11/9/09

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On Sun, 08 Nov 2009 08:36:39 +1000, David Eather wrote:
> Jim Flanagan wrote:
>> I need a replacement for this device in an 8pin dip package. Does
>> anyone have an extra
>> they want to sell or barter? These a unity gain, Jfet, buffers. Mine
>> is being used in a sample
>> and hold circuit that bit the dust. I'm trying to not have to kludge a
>> fix.
>

> It looks like (you better check if you use this idea) that an TL071 (jfet
> inputs) would slot in very well if you can live with the reduced bandwidth
> (3MHz vs 20MHz) and slew rate (13V/uS vs 40V/us)

The LM110/310 is a follower - i.e., unity gain, so if you used an opamp,
you'd have to add a clooge to strap it down to unity gain.

Doesn't have to be a _big_ clooge, if it's a one-off; just lash up a
feedback resistor somewhere near the chip, or maybe even just short
the output to the "-" input.

<anecdote>
One time, my engineer and I were musing about a circuit - he said,
"A zero gain inverter? What would you use a zero gain inverter for?"
I said, "virtual ground." He went, "Ah." and went away happy. :-)
</anecdote>

Hope This Helps!
Rich

Jim Flanagan

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Nov 9, 2009, 9:18:02 PM11/9/09

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> The LM110/310 is a follower - i.e., unity gain, so if you used an opamp,
> you'd have to add a clooge to strap it down to unity gain.
>
> Doesn't have to be a _big_ clooge, if it's a one-off; just lash up a
> feedback resistor somewhere near the chip, or maybe even just short
> the output to the "-" input.
>
> <anecdote>
> One time, my engineer and I were musing about a circuit - he said,
> "A zero gain inverter? What would you use a zero gain inverter for?"
> I said, "virtual ground." He went, "Ah." and went away happy. :-)
> </anecdote>
>
> Hope This Helps!
> Rich
>
>

Hi Rich..
Thanks, yes doing what you mentioned is certainly an easy option. I may
end up doing that in the end.
Jim