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

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  • \$\begingroup\$ 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 \$\endgroup\$ – Claudio Avi Chami Apr 27 '18 at 6:57
  • \$\begingroup\$ Although it must be specified differently, as 1% vs 10% of zero is still zero. \$\endgroup\$ – Dean Franks Apr 27 '18 at 7:06
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    \$\begingroup\$ Possible duplicate of Zero ohm resistor tolerance? \$\endgroup\$ – Arsenal Apr 27 '18 at 7:41
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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.

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  • \$\begingroup\$ Reputable manufacturers post data like < 50 mOhm and not nonsensical % of 0 ohm. \$\endgroup\$ – Arsenal Apr 27 '18 at 7:44
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    \$\begingroup\$ @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. \$\endgroup\$ – TonyM Apr 27 '18 at 8:38
  • \$\begingroup\$ The problem is that the distributors do not :). Thank you very much. \$\endgroup\$ – P__J__ Apr 27 '18 at 8:50
  • \$\begingroup\$ @PeterJ_01, yes the distributors will use the manufacturers' marketing summary. And you're welcome :-) \$\endgroup\$ – TonyM Apr 27 '18 at 9:05

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