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Old 18th Apr 2021, 4:30 pm   #1
TonyDuell
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Default Resistor array markings

I am currently working on a modern-ish PCB, I guess about 30 years old. It contains several of those single-in-line resistor arrays.

Now I am, of course, familiar with the value being given as 3 digits in the part number, which you read like a resistor colour code. So that 472 would be 4k7, 105 would be 1M, etc

One of the devices on this board uses a 4 digit code -- 1002. And yes it is 10k (100*10^2). I checked it with my meter.

Not seen that one before.
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Old 18th Apr 2021, 5:53 pm   #2
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Default Re: Resistor array markings

Used a lot for more precise indication, xxy will only get to 10% xxxy to 1%.
 
Old 18th Apr 2021, 10:26 pm   #3
Julesomega
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Default Re: Resistor array markings

8 resistors with a common connection makes good sense for BCD lines, but the odd one out here is marked 8X-1-104. Unless I've missed something it is 7 × 100k with a common connection (that's what it measures)
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Old 18th Apr 2021, 10:31 pm   #4
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Default Re: Resistor array markings

They were available in various resistor counts although as you say the most obviously useful would be 8-resistor. I have seen them in everything from 4 through to 8 in a package.
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Old 19th Apr 2021, 12:27 am   #5
Terry_VK5TM
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Default Re: Resistor array markings

Just checked my regular supplier - available in every number of pins from 4 - 10.

I have seen bigger ones, but they weren't a resistor to one common pin, rather one resistor between two adjacent pins.
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Old 19th Apr 2021, 2:16 am   #6
trobbins
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Default Re: Resistor array markings

Sometimes required the last pin to be cut off when the parts bin was empty for a particular package.
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Old 19th Apr 2021, 2:35 am   #7
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Default Re: Resistor array markings

They also appear in DIL packages too.
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