The difference of chip capacitors
In electronic components, in addition to resistors, capacitors are common. Capacitors, as the name suggests, are containers that store electrical charges.
Regarding the shape of capacitors, common capacitors can be classified into several types according to their shapes and materials: chip capacitors, tantalum electrolytic capacitors, aluminum electrolytic capacitors, OS solid capacitors, electrodeless electrolytic capacitors, ceramic chip capacitors, mica capacitors, polypropylene capacitors .
Among them, SMD capacitors have their presence in various fields of computer mainframe outdoor lighting, communication, digital, smart audio and video, and automotive electronics, but only a small number of SMD capacitors are marked, and the capacity of marked SMD capacitors can be read. The method is the same as the chip resistor, except that the unit symbol is pF. As for why most chip capacitors are not marked, I think it may be related to the fact that it is not easy to damage. There are many ceramic capacitors and various metalized capacitors in computer power boxes, color displays, and many peripherals. Such capacitors are non-polar capacitors. Their nominal capacity is the same as digital resistors, but some capacitors will With an n, this n means 1000, and its location is also related to the capacity value. For example, the capacity of a nominal 10n capacitor is 10000pF. The nominal capacity of the 4n7 capacitor is 4700pF. As for the withstand voltage of these two types of capacitors, they are all marked on the capacitor.
Aluminum electrolytic capacitors are characterized by large capacity and low cost, so they are widely used in boards, power boxes, and most peripherals. In order to reduce production costs, some manufacturers use a lot of capacitors with relatively low withstand voltage, such as a filter capacitor with a withstand voltage of 6.5V for a voltage of 5V. Although it can be used, the failure rate is slightly higher, and its thermal stability is not very high, so it is common to replace aluminum electrolytic capacitors. Just use a capacitor with a withstand voltage of more than 1.5 times the actual voltage when replacing it, and pay attention to the positive and negative poles not being reversed, especially the electrolytic capacitor of the power supply part. Pay attention to these two points, otherwise it may be Capacitor burst event occurred
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