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PCB/PCBA knowledge
0 ohm resistor – what is it and why we use it

A 0 ohm resistor, also known as a jumper or zero-ohm link, is a tiny electronic component that behaves as a wire with zero resistance. It is essentially a resistor with no resistance value, allowing it to connect different parts of a circuit together without introducing any additional resistance. This handy little component is often used when designing and prototyping electronic circuits, especially when there’s a need for flexibility in configuring connections.

Table of Contents

What is a 0 ohm resistor?

0 ohm resistor
0 ohm resistor

A 0 ohm resistor is a very small resistor whose resistance value is approximately 0 ohms. In fact, it is not “0 ohm” in the true sense, but its resistance value is very small and can be ignored.

0 ohm resistor – what is it and why we use it

Functions of 0 ohm resistors

0 ohm resistors are mainly used for detection and measurement of current in circuits. Due to its small resistance value, the connection in the circuit will hardly affect the circuit, and the current intensity passing through it can also be measured.

Advantages of 0 ohm resistors

Advantages of 0 ohm resistors
Advantages of 0 ohm resistors

Zero-ohm resistors, also known as jumper resistors or shorting links, may seem like an anomaly, but they actually have some useful advantages! Here are a few benefits of using zero-ohm resistors:

1. Circuit Flexibility: Zero-ohm resistors provide the flexibility to easily modify or reconfigure circuit connections. By simply removing or adding these resistors, you can change the circuit layout without the need for complex rewiring.

2. Trace Routing: In printed circuit boards (PCBs), sometimes traces need to cross over each other to save space or optimize the design. Zero-ohm resistors allow designers to create crossover points by bridging the traces, maintaining signal integrity while avoiding complex routing.

3. Circuit Testing: During prototyping or troubleshooting, zero-ohm resistors can be temporarily installed to isolate or bypass certain components or sections of a circuit. This allows for easier testing and debugging without having to desolder or rework the entire circuit.

4. Component Compatibility: By using a zero-ohm resistor, you can maintain compatibility with existing circuit designs that require a physical component in a specific location. Instead of leaving a blank spot on the PCB, you can simply place a zero-ohm resistor to satisfy the design requirements.

How much current can a 0 ohm resistor handle?

Since the resistance value of the 0 ohm resistor is very small, in other words, it can allow a very large current through it. Generally speaking, the rated power of 0 ohm resistor can reach several kilowatts, so it can pass a considerable current intensity.

Applications of 0 ohm resistor

Applications of 0 ohm resistor
Applications of 0-ohm resistor

1. There is no function in the circuit, but it is only on the PCB for debugging convenience or compatible design and other reasons.

2. It can be used as a jumper.

3. When the parameters of the matching circuit are uncertain, replace them with 0 ohms. During actual debugging, determine the parameters and replace them with components with specific values.

4. When you want to measure the current consumption of a certain part of the circuit, you can remove the 0ohm resistor and connect an ammeter, which is convenient for measuring the current consumption.

5. When wiring, if the wiring is really difficult, you can also add a 0 ohm resistor.

6. Act as an inductor or capacitor under high-frequency signals. It is mainly used to solve EMC problems, such as ground and ground, between power supply and IC Pin.

7. Single-point grounding (meaning that the protective grounding, working grounding, and DC grounding are separated from each other on the equipment, and each becomes an independent system.).

8. Fuse effect.

9. Single-point grounding of quasi-ground and digital ground.

10. Used for current loop when crossing. 

11. Configuration circuit.

12.Other uses: jumping wires during wiring; debugging/testing; temporarily replacing other SMD devices; act as a temperature compensation device, etc.

How do you measure a 0 ohm resistor?

Since a 0 ohm resistor is essentially a wire, you can measure it using a multimeter set to the resistance mode. To do this, make sure the power is off, then connect the multimeter leads to both ends of the resistor. If the meter reading shows close to 0 ohms, then you have successfully measured a 0-ohm resistor! Remember, accuracy may vary depending on the quality of your multimeter and any resistance in the test leads themselves.

Can I replace a 0 ohm resistor with a wire?

A 0 ohm resistor is essentially a placeholder component and can be replaced with a wire without any issues. The purpose of a 0-ohm resistor is to provide a convenient way to connect different parts of a circuit together. So if you need to bypass or bridge a connection, feel free to use a wire as a substitute.

FAQ

A 0 ohm resistor is a very small resistor whose resistance value is approximately 0 ohms. In fact, it is not “0 ohm” in the true sense, but its resistance value is very small and can be ignored.

1. Circuit Flexibility

2. Trace Routing

3. Circuit Testing

4. Component Compatibility

Since the resistance value of the 0 ohm resistor is very small, in other words, it can allow a very large current through it. Generally speaking, the rated power of 0 ohm resistor can reach several kilowatts, so it can pass a considerable current intensity.

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