Author Topic: Unknown ICs?  (Read 971 times)

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Offline bitman

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Unknown ICs?
« on: November 04, 2017, 09:06:16 pm »
I got a grab-bag with about 100 ICs in it, and after some difficulties I identified all but a few Motorola chips. You can see the chips in the image - here's what written on them. Google comes up pretty empty when I search on the only part that changes between each chip:

All:
WP-90409L6
10116

Then each chip have a slightly different text on the bottom:
1: CPMJ9906
2: CPPF9905
3: CPDG9905

I expected the bag to consist of basic 7400/CMOS 4000 series chips - all everything else but these fit that.

I have a few other chips all Motorola with MC14556B followed by different CPD numbers on them.

USUALLY I have no problems finding component datasheets using basic search engines. But these come up empty. So maybe there's a better way to find (obsure?) ICs than just googling what's printed on them?
 

Offline Andy Watson

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Re: Unknown ICs?
« Reply #1 on: November 04, 2017, 09:16:41 pm »
« Last Edit: November 04, 2017, 09:25:26 pm by Andy Watson »
 
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Offline bitman

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Re: Unknown ICs?
« Reply #2 on: November 05, 2017, 01:36:54 am »
Could they be MC 10116 ?

Not that I claim to know - but that would make them very very different from the 7400/4000 series which are usually "gates" of some kind.
 

Offline jmelson

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Re: Unknown ICs?
« Reply #3 on: November 05, 2017, 02:50:48 am »
Could they be MC 10116 ?

http://pdf.datasheetcatalog.com/datasheet/motorola/MC10116FN.pdf
YUP, very likely to be 10116, triple differential-in, differential-out line receiver, part of the MECL 10K series.  The 990x numbers are likely the date code, preceded by a lot or factory ID.

Jon
 

Offline amyk

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Re: Unknown ICs?
« Reply #4 on: November 05, 2017, 03:29:27 am »
Could they be MC 10116 ?

http://pdf.datasheetcatalog.com/datasheet/motorola/MC10116FN.pdf
YUP, very likely to be 10116, triple differential-in, differential-out line receiver, part of the MECL 10K series.  The 990x numbers are likely the date code, preceded by a lot or factory ID.

Jon
The package and code matches, but the one thing that would make me refuse a 100% ID is the fact that all the other pictures of MC10116 I can find online have only two lines of marking, explicitly saying "MC10116" on them.
 

Online blueskull

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Re: Unknown ICs?
« Reply #5 on: November 05, 2017, 03:53:39 am »
I'm not an vintage IC expert, but usually my opinion is to ignore the last line of marking. That's usually for fab code, batch code and data code.
 
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Offline SeanB

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Re: Unknown ICs?
« Reply #6 on: November 05, 2017, 05:57:31 am »
Motorola was very easy to get a custom part number out of, they would happily mark any large lot purchase with a customer supplied part number if asked, it was part of the standard order info if you were buying in bulk. That there are 3 different batch number means this was either a regular IC marked as such, or a custom interconnect mask for some customer who wanted a slight variant on some die they made, and who ordered enough of them.

The usual DMM diode check things will at least get you info as to what are inputs, outputs and power and ground pins, so you can class the IC into an appropriate logic or analogue family and further class it if logic or linear into a rough type category ( if a logic then TTL x input y output and rough pinouts) and from there a breadboard, some resistors and a current limited supply will give a logic map to tell you what it is.
 


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