What actually is the percentage tolerance if resistor is 0 ohm?
Asked
Active
Viewed 509 times
0
-
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
-
3Possible duplicate of Zero ohm resistor tolerance? – Arsenal Apr 27 '18 at 07:41
1 Answers
2
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
- 22,898
- 4
- 39
- 64
-
Reputable manufacturers post data like < 50 mOhm and not nonsensical % of 0 ohm. – Arsenal Apr 27 '18 at 07:44
-
1@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