Electronics > Beginners
Resistor Array orientation
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relax:
Hi,
today was the first time that i had a few resistor networks in my hand and of course i ran into the orientation trap. I thought "resistors, direction won't matter". Well, I've learned my lesson :)

But there is one thing i don't understand yet.
In the project there are Bourns 102 circuit resistor networks (isolated) and 101 circuit bussed resistor networks with a common pin.

From my beginner understanding the orientation of the resistor array should only matter on the 101 version with the common pin, but why does the 102 one has the little dot to mark pin 1 as well? Why does it matter if they don't have a common pin?

Thanks in advance
David Hess:

--- Quote from: relax on March 27, 2019, 12:53:37 am ---From my beginner understanding the orientation of the resistor array should only matter on the 101 version with the common pin, but why does the 102 one has the little dot to mark pin 1 as well? Why does it matter if they don't have a common pin?
--- End quote ---

They have the same common pin even though it does not matter on the 102 version because they use the same mold for the packaging.
Brumby:
It is actually rather uncommon for multi pin packages to be insensitive to orientation.  The need for pin identification is, thus, pretty much universal.

The molds used to encapsulate devices will have the identification indicator included.  Since these molds aren't cheap to make, using one with a pin indicator for a device which doesn't need it is simply good economics.
Daixiwen:
For regular electronics it doesn't matter but for top audiophile gear you need to take into account the fact that the electrons, having a negative charge, prefer to flow from a high number pin to a lower one and not the other way round. Putting the package in the correct orientation will give you deeper bass and a better spatial definition (did I get this right?)
babysitter:

--- Quote from: Daixiwen on March 27, 2019, 07:17:09 am ---For regular electronics it doesn't matter but for top audiophile gear you need to take into account the fact that the electrons, having a negative charge, prefer to flow from a high number pin to a lower one and not the other way round. Putting the package in the correct orientation will give you deeper bass and a better spatial definition (did I get this right?)

--- End quote ---


Excellent advice, dear audiophool-oriented friend!

And also forget the poor lady that does optical inspection for 8,50€/hr who has to strain her neck for reading the marking if placed the wrong way.
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