WEET Tells Various Usage Scenarios and Specific Applications of 0 ohm SMD Chip Resistors

A 0 ohm resistor is a resistor with a resistance value of 0 ohms, commonly used in PCB design and other aspects, and is an ideal resistor.

01 Easy to debug or compatible with design: You can choose components, functions, configurations, etc. Hardware engineers need to consider compatibility issues as much as possible when designing PCB boards.

02 used as a jumper: aesthetically pleasing and easy to install, avoiding high-frequency interference caused by jumper pins.

03 When wiring, bridging lines: During the PCB layout and wiring stage, sometimes there may be situations where the wiring cannot go through, especially when the circuit board area is small and there are many connections. It may be necessary to wrap a large circle around a certain connection to connect it. At this time, a 0 ohm resistor can be connected to skip the previous wires.

04 When the matching circuit parameters are uncertain, use a 0 ohm resistor instead: When matching circuit parameters, the parameters cannot be determined. In physical testing, it is necessary to remove a resistor or replace it with a different resistance value to obtain the best solution. At this time, a 0 ohm resistor is usually used.Replace with a 0 ohm resistor, determine the parameters after actual debugging, and then replace with specific numerical components.

05 Measuring Circuit Power Consumption: When unsure about the overall power consumption of a particular chip or circuit, connect a 0 ohm resistor in series at the power supply end. After the board is sampled, remove the 0 ohm resistor and directly measure these two solder joints with a multimeter. This can measure the actual working current situation, and calculate the overall power consumption of the chip or the entire circuit.If you want to measure the current consumption of a certain part of the circuit, connect a 0 ohm resistor and an ammeter, which is convenient for measuring current and can be used to measure large currents.

06 acts as a capacitor or inductor: In high-frequency signals, when the zero ohm resistance matches the characteristics of the external circuit, it can act as a small capacitor or inductor, which can effectively solve EMC problems, such as between ground, power supply and chip pins.

07 is used as a fuse to protect against overcurrent: Due to the high melting current of the wiring on the PCB, it is difficult to fuse in case of short circuit overcurrent or other faults, which may lead to greater accidents. But the current carrying capacity of a 0 ohm resistor is relatively weak. When overcurrent occurs, the 0 ohm resistor will be melted first, which can disconnect the circuit and prevent larger accidents from occurring.

08 Analog ground and digital ground single point grounding: Generally, when designing circuits, in mixed circuits such as digital and analog circuits, it is often required to separate the two grounds and connect them in a single point. We can use a 0 ohm resistor to connect these two grounds instead of directly connecting them together, which divides the ground wire into two networks. When dealing with large areas of copper, it will be much more convenient to prevent floating and accumulating charges, causing static electricity.

09 Jumping is used for current circuits: When dividing the electrical ground plane, it causes the shortest return path of the signal to break. At this time, the signal circuit has to detour, forming a large loop area, and the influence of electric and magnetic fields becomes stronger, making it easy to interfere/be interfered with. Jumping a 0 ohm resistor across the dividing area can provide a shorter return path and reduce interference.

010 configuration circuit: Generally, do not use jumpers or toggle switches on products. Sometimes users may tamper with settings, which can easily cause misunderstandings. In order to reduce maintenance costs, a 0 ohm resistor is used instead of jumper wires and other soldered onto the board.

011 Noise suppression: Due to the inherent characteristics of a 0 ohm resistor, it can effectively suppress loop current, thereby suppressing noise. In fact, zero ohm resistance is not truly impedance free, only superconductors can truly achieve zero impedance.