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Electronics => Beginners => Topic started by: Dragon-foot on April 15, 2019, 08:10:53 pm

Title: zero Ohm Resistor
Post by: Dragon-foot on April 15, 2019, 08:10:53 pm

 Hello,

I have run into what I think is a zero ohm resistor, It looks like a half watt with one black strip. A pic is attached.
Please let me know if I'm on the right track.


Thanks

Title: Re: zero Ohm Resistor
Post by: Mr.B on April 15, 2019, 08:12:54 pm

Yes, it looks like a zero ohm resistor to me.
Yes, zero ohm resistors are a real thing.

Title: Re: zero Ohm Resistor
Post by: golden_labels on April 15, 2019, 08:43:37 pm

Dragon-foot: yes, you are right. They also exist in SMD version. 0Ω are used as jumpers. They are easier to use in automated environments: the same machine, that places resistors, may be used to make links. A minor advantage is that they do not require a separate footprint in PCB design software.

Title: Re: zero Ohm Resistor
Post by: Brumby on April 15, 2019, 11:07:33 pm

As stated above, yes you are right.  It is a zero ohm resistor - for all practical purposes.  We can get all technical and say it isn't exactly zero because it's not a superconductor, but it's as close to zero as a piece of wire.

As well as jumpers, they can be used for configuration setting on a board or sometimes you might have a circuit that can have (something like) a current sense resistor in place for testing, but will work better with zero ohms in a production run.

For SMD boards, a zero ohm resistor can be positioned with a pick and place machine just like any other SMD component.

Title: Re: zero Ohm Resistor
Post by: Dragon-foot on April 15, 2019, 11:43:29 pm

Thanks all