Resistors SMD 0...000

[tigr]

Hi,all
Now, instead of wire jumpers, put resistors SMD with a marking of 0-000.Who has information on these resistors?

[Vic20]

Don't understand the question.

0 Ohm resistors don't replace jumper wires. They usually replace solder bridges.
In my experience they are more used as SMD components.
In some configuration options they can also replace normal resistors. In this case, trough hole ones can come handy.
Jumper wires can connect nodes far apart, zero resistors are more limited.

You can buy them just like normal resistors, like:

http://es.farnell.com/c/componentes-pasivos/resistencias-valor-fijo/resistencias-de-tipo-chip-smd?resistencia=0ohm

[tigr]

Don't understand the question.

Is there any information about the resistance of these resistors?

[Nusa]

Nominally zero ohms. The same resistance as a jumper wire.

[mairo]

Also different sizes will have different power ratings, so be careful there as well if you use it to transfer power across. Datasheets will show you this info.

[Nusa]

As for why, I'd guess it's because automated assembly lines can handle those without any modification.

If you're doing hand-assembled through-hole, just use wire instead.

[tigr]

Nominally zero ohms.

In the book it is written.
,,The actual resistance values of such resistors are in the range of 0.005-0.01Ohm."

[TimFox]

Zero-ohm resistor-shaped objects are useful when using one circuit board layout for different but similar circuits, where the exact function can be chosen at assembly.
When they first came out, it was common to see them quoted as +/- 5% tolerance, just to amuse people.

[T3sl4co1l]

RTFDS.

A typical 0805 might be rated 2A and max 50mohm.  Depends.

If you're buying them from a place that doesn't publish such data (or reliably meet their data!), that's your problem.

Tim

[tigr]

It seems to me that resistance must be defined with a certain tolerance, as with conventional resistors.
For example.
 One zero-0.01 Ohm.

[Nusa]

Plain wire is also a resistor, usually expressed as resistance per specific length. You do the math for shorter lengths.

[wraper]

It seems to me that resistance must be defined with a certain tolerance, as with conventional resistors.
For example.
 One zero-0.01 Ohm.

They are not intended to be any accurate, and resistance of narrow tracks attached to such resistor likely will be higher than that. They are not shunt resistors for accurate current measurement.

[The Soulman]

It seems to me that resistance must be defined with a certain tolerance, as with conventional resistors.
For example.
 One zero-0.01 Ohm.

They are not intended to be any accurate, and resistance of narrow tracks attached to such resistor likely will be higher than that. They are not shunt resistors for accurate current measurement.

Yes they intended to be perfect 0 Ohm but in reality it is next to impossible to make such a device so the men and woman at the factory do their best to achieve that but admit they can't and honestly state in the datasheet what they on average achieve (the "typical" value) and what they think is the highest value of what they could sell to you (the "maximum" value).

[tigr]

Plain wire is also a resistor,

Yes, but it has a resistance of 0.000 Ohm.
And the SMD resistors do not have such low resistance.

[tigr]

but admit they can't and honestly state in the datasheet what they on average achieve (the "typical" value) and what they think is the highest value of what they could sell to you (the "maximum" value).

I completely agree.
The resistance of the jumper also affects how the circuit works. Or not?
I think there is a difference between 0.05 and 0.005 Ohm.

[wraper]

Plain wire is also a resistor,

Yes, but it has a resistance of 0.000 Ohm.

It's not, unless you talk about very low length and high cross section.

[Nusa]

Plain wire is also a resistor,

Yes, but it has a resistance of 0.000 Ohm.
And the SMD resistors do not have such low resistance.

This is a special case where % tolerances of an ideal resistor value doesn't make sense (any % of 0 is still 0). ALL of these 0-ohm resistors are > 0 but < max given. Don't confuse max value with typical value.

As an example, here's a version of a zero-ohm jumper that is literally just a piece of wire:
https://www.mouser.com/ds/2/219/JL-242520.pdf
It's specified to have a maximum resistance of 0.010 Ohms, clearly greater than 0.0005 ohms.

Anyone who actually needs to worry about values this small probably also has to calculate the resistance of their traces.

[BravoV]

Plain wire is also a resistor,

Yes, but it has a resistance of 0.000 Ohm.
And the SMD resistors do not have such low resistance.

On small resistance that you can not measure, doesn't mean they are perfect zero, there is no such thing, especially at room temperature.

but admit they can't and honestly state in the datasheet what they on average achieve (the "typical" value) and what they think is the highest value of what they could sell to you (the "maximum" value).

I completely agree.
The resistance of the jumper also affects how the circuit works. Or not?
I think there is a difference between 0.05 and 0.005 Ohm.

Yes, 0.05 is clearly different from 0.005 , but show us where you found the circuit/board/pcb that will behave so differently when using a tiny SMD resistor of 0.05 vs 0.005 Ohm.

[tigr]

This is a special case where % tolerances of an ideal resistor value doesn't make sense (any % of 0 is still 0). ALL of these 0-ohm resistors are > 0 but < max given. Don't confuse max value with typical value.

Having carried out a whole series of measurements of different sized resistors with one zero, came to the conclusion that such resistors have a resistance of 0.01Ohm.
So I measured a resistor with one zero.

[tautech]

This is a special case where % tolerances of an ideal resistor value doesn't make sense (any % of 0 is still 0). ALL of these 0-ohm resistors are > 0 but < max given. Don't confuse max value with typical value.

Having carried out a whole series of measurements of different sized resistors with one zero, came to the conclusion that such resistors have a resistance of 0.01Ohm.
So I measured a resistor with one zero.

Wrong conclusion.

Get an 8.5 digit DMM and do 4 wire measurements if you want correct results ! .......but only to the resolution and accuracy of that DMM.

[Buriedcode]

Plain wire is also a resistor,

Yes, but it has a resistance of 0.000 Ohm.
And the SMD resistors do not have such low resistance.

Aside from superconducting materials at very low temperatures - everything has resistance.  0-ohm SMD resistors are simply guaranteed to be lower than a certain threshold with little regard to accuracy.

Just because something has "000" on it doesn't necessarily mean "0.00" and even if it did it gives no indication of accuracy.  Most likely they are manufactured the same way other resistors are, and those have a 3-digit code.  So rather than change the manufacturing to only print one digit "0" they print three.

Also, don't confuse accuracy, with precision, or tolerance.  There are different concepts.  Often values are printed with far more decimal points than is possible to measure accurately, usually because figures are generated with a certain number of digits, say 3 decimal places, even when the measurement accuracy is terrible. eg  1.446 +/- 0.5  should be to one decimal place -> 1.5 +/- 0.5. 

This misunderstanding may seem insignificant but I have known designers to assume builders work to sub milliliter accuracy because their software uses figures to several decimal places.

I'm intrigued - do you think that all 10k resistors have exactly 10.000k ohm? And how accurately you can measure things is down to how accurate your equipment is - and again we bumped into the difference between accuracy, precision and tolerance. https://meettechniek.info/measurement/accuracy.html

[TMM]

Yes, you need a 4 wire measurement to accurately measure that low since the resistance of the leads/probes will become substantial.

[BravoV]

Having carried out a whole series of measurements of different sized resistors with one zero, came to the conclusion that such resistors have a resistance of 0.01Ohm.
So I measured a resistor with one zero.

Your conclusion is questionable as there is no accuracy using such meter and method.

It could be 0.03 ... or 0.02 .. or 0.009999 ... or even 0.015 ... but again, it doesn't matter for that circuit, try get another identical one, solder on top of it to make parallel resistors, the circuit will still works, or even desolder it, put two or three in series, still it will work fine.

[tigr]

Yes, you need a 4 wire measurement to accurately measure that low since the resistance of the leads/probes will become substantial.

OK.

[Nerull]

Nominally zero ohms.

In the book it is written.
,,The actual resistance values of such resistors are in the range of 0.005-0.01Ohm."

Unless you're working with superconductors, everything has resistance.

They are *approximately* zero ohms, just like you assume wires in your circuit to be.

You're aware that wires have resistance, yes?