Function of 0 ohm resistor

Function of 0 ohm resistor

There are probably several functions: ① Used as a jumper. This is both beautiful and easy to install. ② In mixed circuits such as digital and analog, it is often required that the two grounds be separated and connected at a single point. We can use a 0 ohm resistor to connect the two grounds instead of connecting them directly. The advantage of this is that the ground wire is divided into two networks, which will be much more convenient when processing large areas of copper plating. As a reminder, in such occasions, inductors or magnetic beads are sometimes used for connection. ③ Used as a fuse. Since the fuse current of the wiring on the PCB is large, it is difficult to fuse if a short circuit or overcurrent occurs, which may cause a greater accident. Since the current bearing capacity of the 0 ohm resistor is relatively weak (in fact, the 0 ohm resistor also has a certain resistance, but it is very small), the 0 ohm resistor is first fused when overcurrent occurs, thereby disconnecting the circuit and preventing a greater accident. Sometimes some small resistors with a resistance of zero or several ohms are used as fuses. However, it is not recommended to use it this way, but some manufacturers use this to save costs. ④ Reserved position for debugging. You can decide whether to install or set other values ​​according to your needs. Sometimes it is marked with * to indicate that it is determined during debugging. ⑤ Used as a configuration circuit. This function is similar to a jumper or a DIP switch, but it is fixed by welding, which prevents ordinary users from modifying the configuration at will. By installing resistors in different positions, you can change the function of the circuit or set the address.