When the chip resistor is damaged, how to choose a replacement product?

In the use of chip resistors, if the product is damaged, when choosing to replace the original damaged chip resistor, first consider the same resistance value, and secondly pay attention to the size and power. If the size is inconsistent in the small signal circuit, it will be more difficult to solder and install. Therefore, the following points should be paid attention to when replacing chip resistors:

1) Analog signal processing circuits, such as operational amplifier circuits, have strict requirements on the resistance of the input and feedback resistors. The resistance values should be the same during substitution, and there can be no big differences, otherwise it will cause abnormal circuit operation.

2) The chip resistors used in digital circuits have a certain range of resistance, as long as the signal voltage changes significantly and meets the requirements of high and low levels. During the actual repair, if there is no component with the same resistance value on your hand, you can replace it with a component with a similar resistance value, which usually does not affect the circuit performance. For example, if a 4.7kΩ resistor is damaged, it can be replaced with a 5.1kΩ or 6.8kΩ resistor.

3) Replace with non-chip components. The damage rate of chip resistors is low. Under normal circumstances, if damaged, you can use 1/4W or 1/8W ordinary resistors, but the resistance should be the same or close. In addition, pay attention to shaping the pins when soldering, and make the pins as short as possible.

That's it for sharing. Through the appeal explanation, everyone knows when switching to SMD resistors. First look at the marked resistance value and second look at the size of the resistor. Only when the two are the same or very close, can they be replaced.