Author Topic: Please Help Me Identify this part:  (Read 1281 times)

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Offline jcw0752Topic starter

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Please Help Me Identify this part:
« on: July 17, 2018, 04:07:54 am »
While cleaning out the backroom of an Electronics Store we came across about 100 of these chips. I took them to the shop but I have not been able to determine what they are. Resistance readings are very high and capacitance readings are negligible. Hamlin is now owned by Littlefuse. The 8235 on each appears to be a date code which makes sense as all the other chips that were with this lot all came from the 1970s. Anyone have any ideas. I have tried to Google the image also with no results.
 

Offline Jwillis

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Re: Please Help Me Identify this part:
« Reply #1 on: July 17, 2018, 04:50:36 am »
A resistor array?
 
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Offline TERRA Operative

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Re: Please Help Me Identify this part:
« Reply #2 on: July 17, 2018, 05:27:37 am »
Hmmm. Well the numbering doesn't like up with the pins, so that isn't showing pin numbers.
Maybe it is a check list of the number of times it can do something, or that it has 12 configurations or the like.

It almost looks to have a top cap of some sort, can you try to peel it of or open it up?
It's almost like it's a little metal box or something. The legs are soldered in place.
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 
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Online ataradov

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Re: Please Help Me Identify this part:
« Reply #3 on: July 17, 2018, 05:28:57 am »
It almost looks to have a top cap of some sort, can you try to peel it of or open it up?
It is a ceramic package with green paint, it won't peel.

It is most likely an array of some elements.
Alex
 
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Offline +Mikie

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Re: Please Help Me Identify this part:
« Reply #4 on: July 17, 2018, 01:58:28 pm »
If it isn't a resistor array (which should be easy to check with a meter), it could be a hybrid. Kinda like ASIC from last century :)

Is this just curiosity or you planning to do something with it?
 
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Offline jcw0752Topic starter

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Re: Please Help Me Identify this part:
« Reply #5 on: July 18, 2018, 03:10:15 am »
Hi Jwillis,
Yes it turned out to be a special purpose resistor array. I will attach a picture of the inside after I removed some of the paint. The manufacturer had produced a low quality resistor array with 15 internal resistors of approximately 130 ohms each all tied to a common Pin 16. The User was likely using these arrays as DIP shunts by frying the unwanted resistor with a pulse of high current. This left all resistors damaged and at OL or at least quite high resistance except Pins 10 and 12. When used in a circuit with pull up resistors this damaged resistor array acted just like a 15 section programmable shunt. I wrote a more detailed report of the experiments that I ran thanks to suggestions from the folks that responded to my request for help. Here is a link to that report if I have done it correctly.
 https://www.element14.com/community/thread/64516/l/please-help-with-the-identification-of-this-part
John
 
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Offline jcw0752Topic starter

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Re: Please Help Me Identify this part:
« Reply #6 on: July 18, 2018, 03:14:22 am »
Hi +Mikie,
A little bit of each. I can't do anything with it until I understand it. Now that I understand it I find I have about a hundred fairly useless arrays with 13 fused resistors each and only 2 non-fused resistors in each chip. Thanks for your question.
John
 


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