Author Topic: Help needed identifying the specs and topology of a resistor network (sorted)  (Read 1002 times)

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Offline max.wwwangTopic starter

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I have a resistor network I'm unable to find a datasheet or specs online. It has 8 pins and is marked "IHR-4-103 JB". It looks like the one in "photo1".

I'm not familiar with this kind of thing. Google tells me there can be many kinds of internal wirings. Shown in "photo2" are two types that are included in the component lib of KiCAD. There are other configurations, obviously.

I don't want to take it off the board to measure because very likely it's not broken but will be broken by me. So I've managed to measure the resistances across all of its pins (in photo3). Being inline obviously may have an impact on the readings. But anyway, in experienced eyes this might be obvious.

(Pin 1 in the table is the one marked with a dot, at the LHS of the label.)

Help please! What do the specs look like (particularly topology)? Thanks.
« Last Edit: February 16, 2023, 07:39:15 pm by max.wwwang »
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Offline RoGeorge

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #1 on: February 16, 2023, 08:56:05 am »
Looks like 4 x 10k, 4 individual resistors, 1 of 10k resistor between pins 1-2, and 3 more between pins 3-4, 5-6 and 7-8.

Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #2 on: February 16, 2023, 09:06:50 am »
1717952-0
Looks like 4 x 10k, 4 individual resistors, 1 of 10k resistor between pins 1-2, and 3 more between pins 3-4, 5-6 and 7-8.

Do you mean something like this?

That cannot be correct. Because if it was, the reading between some pins will be 0, such as 2/3.

But Thanks!

Edit: Ok, I think you mean other readings are due to inline?
« Last Edit: February 16, 2023, 09:09:21 am by max.wwwang »
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Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #3 on: February 16, 2023, 09:10:44 am »
I think you mean this.
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Offline RoGeorge

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #4 on: February 16, 2023, 09:12:45 am »
Yes, like this:
 
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Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #5 on: February 16, 2023, 09:15:25 am »
Yes, like this:

I believe that's it!

So "IHR-4-103" probably means:

"I": Independent? Or isolated (less likely)
"H": ?
"R": Resistor without a doubt
"4": Four(4) resistors surely
"103": 10e3

Thanks!
« Last Edit: February 16, 2023, 07:12:50 pm by max.wwwang »
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Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #6 on: February 16, 2023, 09:28:35 am »
So this is the component in my lib for KiCAD schematics!
« Last Edit: February 16, 2023, 09:41:43 am by max.wwwang »
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Offline gamalot

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #7 on: February 16, 2023, 09:40:17 am »
My guess
I'm a poet, I didn't even know it. |  https://youtube.com/@gamalot | https://github.com/gamalot
 
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Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #8 on: February 16, 2023, 09:44:12 am »
My guess
Man, with a quick look --- this is well-done!
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Offline gamalot

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #9 on: February 16, 2023, 10:37:25 am »
I think I was wrong. it should be like this:
I'm a poet, I didn't even know it. |  https://youtube.com/@gamalot | https://github.com/gamalot
 
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Offline max.wwwangTopic starter

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Re: Help needed identifying the specs and topology of a resistor network
« Reply #10 on: February 16, 2023, 07:38:49 pm »
I think I was wrong. it should be like this:

The attached should be the case. Thanks. Well done! You've deciphered not only the component but also the circuit around it. You are a star! :-+
« Last Edit: February 16, 2023, 08:00:32 pm by max.wwwang »
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