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

Use

One use is to allow traces on the same side of a PCB to cross: one trace has a zero-ohm resistor while other traces can run in between the leads/pads of the zero-ohm resistor, avoiding contact with the first trace. Zero ohm resistors can also be used as configuration jumpers or in places where it should be easy to disconnect and reconnect electrical connections within a PCB to diagnose problems.

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).[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 zero-ohm resistors are usually marked with a single or multiple "0" (if size allows marking), where the number of digits can indicate the tolerance or maximum resistance rating, as is the case with regular resistors.[3] 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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