Zero-ohm link

A zero-ohm link or zero-ohm resistor is a wire link packaged in the same physical package format as a resistor. It is used to connect traces on a printed circuit board (PCB). This format allows it to be placed on the circuit board using the same automated equipment used to place other resistors, instead of requiring a separate machine to install a jumper or other wire.[1] Zero-ohm resistors may be packaged like cylindrical resistors, or like surface-mount resistors.

Zero-ohm axial lead resistor
Zero-ohm surface-mount resistor

One use is to allow traces on the same side of a PCB to cross: one trace has a zero-ohm resistor while the second trace runs in between the leads of the resistor, avoiding contact with the first trace.

The resistance is only approximately zero; only a maximum is specified, which is typically in the range of 10–50 mΩ.[2] However variants with ultra low resistance of under 0.5 mΩ are available.[3] A percentage tolerance would not make sense, as it would be specified as a percentage of the ideal value of zero ohms (which would always be zero), so it is not specified.[4]

An axial-lead through-hole zero-ohm resistor is generally marked with a single black band,[5] the symbol for "0" in the resistor color code. Surface-mount resistors are generally marked with a single "0" or "000" (if size allows marking). They are often implemented as thick film resistors.

See also

References
  1. Blackwell, Glenn R.; Hollomon, James K. (2006). Surface-mount technology for PC boards (2nd ed.). Australia: Thomson Delmar Learning. p. 88. ISBN 978-1-4180-0011-0.
  2. Archambeault, Bruce R.; Drewniak, James (2002). PCB Design for Real-World EMI Control. Springer. p. 168. ISBN 978-1-4020-7130-0.
  3. "PMR series - jumper type - Datasheet" (PDF). Rohm. 2020. p. 1. Retrieved 17 November 2021.
  4. Vishay Intertechnology (27 May 2020). "D/CRCW e3 Standard Thick Film Chip Resistors" (PDF). Mouser Electronics. p. 2. Retrieved 3 February 2020. Type D10/CRCW0402 e3 / TCR Jumper, Imax. = 1.5 A / tolerance ≤ 20 mOhms
  5. Paynter, Robert T.; Boydell, Toby (2008). Electronics Technology Fundamentals: Conventional Flow Version (3rd ed.). Prentice Hall. p. 50. ISBN 978-0-13-504874-0.
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