74XX Series: Alternative Numbering?

[1-ev]

Dear all,

i've got a whole bunch of supposedly 74-series IC's. However, i'm not able to identify all of them, because of their numbering...for example:

• 239 2100 (Texas Instruments) - should be 7400
• 158 2607 - should be 74LS174
• 159 0171 - ?
• 239 2106 - ?
• 239 2108 - ?
• ...

I did a quick internet search, but i couldn't find any information. Does somebody know this numbering system?

Regards,

1-ev

[IconicPCB]

Search the web for Hewlett Packard part number cross refference. Those codes look very much like old HP stock.

[1-ev]

Thet look like the last 4 digits could be a date code 21st week 2000, 26th week 2007 and so on. It is a little odd to see a 37 year range though. 1971-2008. How did you come by these chips? What makes you think they might be 7400 series?

They came along with a "Mini-Micro Designer I" i've purchased...some of them are manually labeled with their corresponding 74-number.

[mrgregs]

I found this copy of the Mini Micro Designer I manual which has the original parts marked (and schematics) in a google search - maybe that could help? http://www.joelowens.org/mmd1/manual_revl.pdf

[macboy]

They are not HP part numbers; they are always 4+4 digits in my experience.

I found this schematic  for some kind of IBM keyboard controller that describes the part in your photo, but shows National as the manufacturer, not TI. Maybe they are IBM in-house part numbers?

[JoeO]

Yes, they are IBM part numbers.  I do remember that 2392100 is a 7400.

However there is not a correlation, i.e. 2392104 is not a 7404.

[Richard Crowley]

They are proprietary OEM "house numbers".  Manufacturers use them internally for inventory control, etc.
And sometimes, they are used for obfuscation, to prevent others from knowing exactly what components they are.

First, you must identify what manufacturer's numbers those are.
Then maybe you can find a secret decoder ring to translate them into standard numbers.
But I wouldn't hold my breath. Especially if you can't even identify the manufacturer.

[Richard Crowley]

IF those ARE chips from IBM, then it doesn't agree with your assumption: 239 2100 = 7400
At least not according to this list: http://www.kbdbabel.org/kbdbabel-ibm-part-number-list

[amyk]

7437 and 7400 have the identical logic function and pinout, the difference is the '37 can supply more current.

Looks like you would find one of these very useful: https://www.eevblog.com/forum/testgear/chinese-ic-testers/

[1-ev]

They are not HP part numbers; they are always 4+4 digits in my experience.

I found this schematic  for some kind of IBM keyboard controller that describes the part in your photo, but shows National as the manufacturer, not TI. Maybe they are IBM in-house part numbers?

Thank you...the IC numbering shown there fits to the few hand labeled ones i've got (except for 239 2100, which should be 7400 and not 7437). As it looks, it will be hard to identify the remaining IC's...

Thank you all for your help...

Merry Christmas,

1-ev