[sdiy] Resistor Networks....

Brian Willoughby brianw at audiobanshee.com
Sun Aug 30 06:17:41 CEST 2020

Why not use SMD networks?

I've used the following



… in digital designs without any issues. Granted, these have a common pin, but if you check the manufacturer (CTS) data sheets and product family you'll see every variation of parallel and network configuration available. I've only used them for digital because my analog circuit layout never seemed to facilitate a network. I'm sure that an SMD network will work just as well as discrete SMD resistors in an analog circuit.

Sounds like you're considering mixing the original through-hole resistor networks with modern SMD, and I wouldn't bother with that. Just use SMD resistor networks.

Brian Willoughby

p.s. Some digital designers don't like the resistor networks because they find them harder to lay out. I did not have that problem. I believe it's the folks who actually like using 0102 SMD that find the networks "too big" - but I have only used 0102 in one design and was told to never do that again for the sake of sanity (at least during prototype stages).

On Aug 29, 2020, at 8:32 PM, Pete Hartman <pete.hartman at gmail.com> wrote:
> I'm working on laying out a classic through hole module design with SMD parts.  The original uses a fair number of resistor networks, most of them just parallel resistors, not common bus versions.  The resistor networks are, well... huge by comparison.
> Unfortunately the original designer isn't around for me to ask for input.
> My *impression* based on how the networks are being used (often times for things like input resistors and a feedback resistor in a summing op amp config, just as one example) is that part of their purpose was to get parts that were well matched.  But that's not anything but a gut feeling.
> So I'm looking for seasoned opinions about whether there is any important reason to keep resistor networks, when I can sub in 1% SMD parts that will take up less space and be more flexible for placement.  Are the networks either 1) better matched even than 1% parts, or 2) have some other characteristic which I'm not thinking of that might be important?
> Thanks
> Pete

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