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What actually is the percentage tolerance if resistor is 0 ohm?

Oldfart
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0___________
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  • Like any other resistor, the 0 Ohm resistor has a tolerance specified by the manufacturer. There is not a generic tolerance for this resistor, the only obvious difference with other resistors is that it can only be positive tolerance – Claudio Avi Chami Apr 27 '18 at 06:57
  • Although it must be specified differently, as 1% vs 10% of zero is still zero. – Dean Franks Apr 27 '18 at 07:06
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    Possible duplicate of [Zero ohm resistor tolerance?](https://electronics.stackexchange.com/questions/5369/zero-ohm-resistor-tolerance) – Arsenal Apr 27 '18 at 07:41

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In practice, it means the 0 R resistor belongs to a family of resistors from a manufacturer that all have that tolerance.

For example, a manufacturer will make a family of 1 % resistors. All the parts in this family have a tolerance of 1 %. The family includes a 0 R resistor so this is also specified as 1 %.

Mathematically, its nonsense. But it allows the 0 R resistor to be clearly recognised as a member of that family, rather than be set apart by slightly different specs. The manufacturers appear to prefer to have that consistency, reasonably enough.

TonyM
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  • Reputable manufacturers post data like < 50 mOhm and not nonsensical % of 0 ohm. – Arsenal Apr 27 '18 at 07:44
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    @Arsenal, in the datasheet specs they will but not in the family summary and marketing summary, the component's named value there is 0 R. It's harmless enough though, it doesn't mislead people into design errors. – TonyM Apr 27 '18 at 08:38
  • The problem is that the distributors do not :). Thank you very much. – 0___________ Apr 27 '18 at 08:50
  • @PeterJ_01, yes the distributors will use the manufacturers' marketing summary. And you're welcome :-) – TonyM Apr 27 '18 at 09:05