Re: [neonixie-l] LM9022 on ebay

[taylorjpt]

These are the exact same parts (Mechanically, perhaps not performance 
wise), right down to the mask set which has not changed since 2001:  Every 
layer in the set has the same revision between these two parts.

New LM4871 from Digikey:
http://ppl.ug/i4CUcbOKElY/

>From the LM4871 data sheet:
http://ppl.ug/j1G65GS5644/

LM4871 date code is 32AC = 2003 or 2013, weeks 12 to 17, Die run "AC"
(Probably 2013 because Digikey has thousands of them.  It looks like these 
were introduced in 1997: http://ppl.ug/n7kz2l2RUmo/)

LM9022 date code is 449E = 2004, weeks 24 to 29, Die run "9E"
(Not 1984 or 1994 etc as the mask set is from 2001, not 2014 as I owned 
these many years ago.  It looks like these were released in 2001: 
http://ppl.ug/myU2AVIrnZc/)

jt

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Re: [neonixie-l] LM9022 on ebay

['threeneurons' via neonixie-l]

>
>
> Mouser has over 4000 of them. Not bad ones-n-two-zees prices. $1.42 on a 
> reel tape, $1.71 in a rigid tube. And a good price break if you get 10 or 
> more. Probably same prices at Digi-Key and Newark (Farnell).
>
>>
>>
 
http://www.newark.com/webapp/wcs/stores/servlet/Search?catalogId=15003&langId=-1&storeId=10194&st=lm4871&pageSize=25&showResults=true&sf=783
 


Newark is currently running a special on them ... 68 cents US, and they 
only have ~1200 of them !

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Re: [neonixie-l] LM9022 on ebay

['threeneurons' via neonixie-l]

That's pretty definitive ! A LM9022 is a LM4871.

Yes, extra brownie points, for opening one up, and the photos ! I didn't 
expect to see the actual part number ! An internal code, that translates to 
a part number, but not the actual part number.

http://www.mouser.com/Semiconductors/Audio-ICs/Audio-Amplifiers/_/N-4gxtfZscv7?P=1z0z7v5&Keyword=LM4871&FS=True

Mouser has over 4000 of them. Not bad ones-n-two-zees prices. $1.42 on a 
reel tape, $1.71 in a rigid tube. And a good price break if you get 10 or 
more. Probably same prices at Digi-Key and Newark (Farnell).

On Monday, November 3, 2014 11:31:04 AM UTC-8, taylorjpt wrote:
>
> Images of LM9022 die...
>
> http://ppl.ug/PCAptU3GN6g/
> http://ppl.ug/5DTx4xMnVT4/
> http://ppl.ug/dDfWdwPaa4I/
>
>

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Re: [neonixie-l] LM9022 on ebay

[Nick]

You get special points for that - very interesting!

Cheers

Nick

On Monday, 3 November 2014 19:31:04 UTC, taylorjpt wrote:
>
> Images of LM9022 die...
>
> http://ppl.ug/PCAptU3GN6g/
> http://ppl.ug/5DTx4xMnVT4/
> http://ppl.ug/dDfWdwPaa4I/
>
>

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Re: [neonixie-l] LM9022 on ebay

[Dekatron42]

That is most interesting! Thank you for taking the time and effort to show 
us this!

/Martin

On Monday, 3 November 2014 18:19:07 UTC+1, taylorjpt wrote:
>
> Pulled the die from one of my ca 2001 LM9022s and it was indeed an LM4871 
> (Picture later).  This makes me think that the LM9022 is a way to absorb 
> fallout from the LM4871 line, and if they don't have enough fallout they 
> could just use good LM4871s instead.
>
> jt
>
>
>

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Re: [neonixie-l] LM9022 on ebay

[taylorjpt]

Images of LM9022 die...

http://ppl.ug/PCAptU3GN6g/
http://ppl.ug/5DTx4xMnVT4/
http://ppl.ug/dDfWdwPaa4I/

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Re: [neonixie-l] LM9022 on ebay

[taylorjpt]

Pulled the die from one of my ca 2001 LM9022s and it was indeed an LM4871 
(Picture later).  This makes me think that the LM9022 is a way to absorb 
fallout from the LM4871 line, and if they don't have enough fallout they 
could just use good LM4871s instead.

jt


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Re: [neonixie-l] LM9022 on ebay

['threeneurons' via neonixie-l]

>From reading both datasheets, the specs are so close, if not identical, 
they are the same part. Even the pinout is the same ! So use the LM4871.

Cutting the top off of one, and looking at the guts, may not reveal 
anything. Chip makers periodically change the mask set of all ICs, to keep 
up with the current processes, that they have on the line. I had a 
supervisor, once, who worked for a semi house. He said they changed mask 
sets at least once a year. And this is for old established parts. A LM358, 
today, won't look like one made in 2003, and both different from one made 
in 1983. They can only keep so many lines, and the wafers just get bigger.

On Sunday, November 2, 2014 3:51:31 PM UTC-8, Dekatron42 wrote:
>
> Why not ask TI directly? Anyone here who can do that?
>
> /Martin
>
> On Thursday, 30 October 2014 19:49:35 UTC+1, jrehwin wrote:
>>
>> > The two parts look nearly identical from the datasheets.  Since it was 
>> common to simply add an application diagram to an existing datasheet 
>> instead of creating a new part number, the LM9022 was probably a way to use 
>> LM4871s that failed some of the audio amplifier specs that would be 
>> critical to an audio aplication but would be of no concern for driving a 
>> VFD. 
>> > 
>> > I have 200 of the LM9022s, I'll get some of the LM4871s and compare 
>> them. 
>>
>> I'm tempted to get one of each and have a friend decap and examine them. 
>>
>> - John 
>>
>>

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Re: [neonixie-l] LM9022 on ebay

[Dekatron42]

Why not ask TI directly? Anyone here who can do that?

/Martin

On Thursday, 30 October 2014 19:49:35 UTC+1, jrehwin wrote:
>
> > The two parts look nearly identical from the datasheets.  Since it was 
> common to simply add an application diagram to an existing datasheet 
> instead of creating a new part number, the LM9022 was probably a way to use 
> LM4871s that failed some of the audio amplifier specs that would be 
> critical to an audio aplication but would be of no concern for driving a 
> VFD. 
> > 
> > I have 200 of the LM9022s, I'll get some of the LM4871s and compare 
> them. 
>
> I'm tempted to get one of each and have a friend decap and examine them. 
>
> - John 
>
>

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Re: [neonixie-l] LM9022 on ebay

[John Rehwinkel]

> //I'm tempted to get one of each and have a friend decap and examine them. 
> // -John 
> 
> That's actually not a bad idea.  When the LM4871s come in I'll do just that.

Oh, you have the facilities for that?  Because I'm all curious now.

- John


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Re: [neonixie-l] LM9022 on ebay

[taylorjpt]

//I'm tempted to get one of each and have a friend decap and examine them. 
// -John 

That's actually not a bad idea.  When the LM4871s come in I'll do just 
that. 

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Re: [neonixie-l] LM9022 on ebay

[John Rehwinkel]

> The two parts look nearly identical from the datasheets.  Since it was common 
> to simply add an application diagram to an existing datasheet instead of 
> creating a new part number, the LM9022 was probably a way to use LM4871s that 
> failed some of the audio amplifier specs that would be critical to an audio 
> aplication but would be of no concern for driving a VFD.
> 
> I have 200 of the LM9022s, I'll get some of the LM4871s and compare them.

I'm tempted to get one of each and have a friend decap and examine them.

- John

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Re: [neonixie-l] LM9022 on ebay

[Quixotic Nixotic]

On 11 Oct 2014, at 19:01, Grahame Marsh wrote:

> Hi
> 
> The LM9022 IC which is a fairly niffty VFD driver has turned up on ebay item 
> 171472657676
> 
> No affiliation.
> 
> Grahame

I never understood why I was still ordering and getting free samples, long 
after everyone on this group was saying they were unobtanium. Oh well.

John S


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[neonixie-l] LM9022 on ebay

[Grahame Marsh]

Hi

The LM9022 IC which is a fairly niffty VFD driver has turned up on ebay 
item 171472657676


No affiliation.

Grahame

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