The role of ohm resistance:

The 0 ohm resistor has a very wide range of applications, is currently shipped in the largest number of resistance values, such as it can be used in the following situations:

Single point ground analog and digital ground:

It means that protection grounding, working grounding, and DC grounding are separated from each other on the device and become independent systems.

Used as a jumper:

It can improve production efficiency and reduce cost (much lower than jumper cap cost).

Fuse function:

0 ohm resistance Resistance actually has an impedance, current tolerance is relatively weak (0 ohm resistance is generally 20-60 m ohm (milliohm)), the current will be the first to fuse the 0 ohm resistance, thus breaking the circuit, preventing the occurrence of a larger accident. 0 ohm as a fuse, can protect where the requirements are not strict, can greatly reduce the cost.

Space reserved for debugging:

Can according to the need, decide whether to install, or other values are not sure, you can at the beginning of the design, to string a resistance used for debugging and reserve position, convenient circuit debugging later, if the debugging results do not need to add resistance, add a 0 ohm resistance. Sometimes, it can be the need of EMC countermeasures, reserve the position, if the EMC performance is not good, you can replace the magnetic beads (expensive).

Configuration circuit:

In general, products do not appear jumpers and dip switches. Sometimes users will mess with the Settings, easy to cause misunderstanding, in order to reduce maintenance costs, the application of 0 ohm resistance instead of jumper welding on the board. Vacant jumper is equivalent to antenna at high frequency, with good resistance effect patch. This function is similar to the jumper or dip switch, but fixed by welding, so that ordinary users do not modify the configuration. By installing resistors at different locations, you can change the function of the circuit.

The current through which ohms can flow:

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