Zero-ohm resistors, often referred to as “zero-ohm links,” are a practical component in electronic circuits despite having a resistance value close to zero (typically a few milliohms). Here’s why they are still termed as resistors and their various uses:
Compatibility and Configuration: Zero-ohm resistors are used in designs that may require changes during the development phase or after deployment. They can be used to configure electronic circuits differently based on the requirements, acting as configurable jumpers that can easily be replaced or removed.
Bridge Connections: They are often used to bridge connections across traces on a PCB. This allows for more flexible PCB layout options without the need for complex routing solutions.
Measurement Purposes: Zero-ohm resistors can be used to measure current in a circuit. By inserting them into a circuit, it becomes possible to measure the voltage across them to calculate the current, using Ohm’s law, without significantly affecting the circuit’s behavior.
RF Applications: In high-frequency circuits, zero-ohm resistors can mimic the behavior of capacitors or inductors due to their physical properties and how they interact with the circuit at certain frequencies.
Fuse-Like Protection: They can serve as a fusible link. Under excessive current, the zero-ohm resistor can act as a fuse, opening the circuit when the current exceeds safe levels, thus protecting other components.
Current Loop Configuration: Zero-ohm resistors can be used to configure or modify current loops in a circuit layout, aiding in the management of current paths and reducing complexity in wiring.
