Capacitor life and quality related to the brand - News - Global IC Trade Starts Here Free

SMD aluminum electrolytic capacitor

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Chip ceramic capacitor

Patch Murata capacitor

Filter 18.432M

The most common capacitor except the resistor is the capacitor. Simply put, the capacitor is the container that stores the charge. For the shape of the capacitor, most people who know the hardware know it, so I will only talk about it. Common capacitors can be classified into shape capacitors, tantalum electrolytic capacitors, aluminum electrolytic capacitors, OS solid capacitors, electrodeless electrolytic capacitors, ceramic capacitors, mica capacitors, and polypropylene capacitors.
Among them, the chip capacitor is the most common on all kinds of boards in the computer mainframe, but only a small number of chip capacitors have the mark. The capacity of the chip capacitor with the mark is read in the same way as the chip resistor, but the unit symbol is pF. (1000000pF = 1μF), as for most of the chip capacitors, why most of them have no logo, I think it may not be related to its damage. There are many ceramic capacitors and various metallized capacitors in the computer power supply box and color display and many peripherals, so I have to say that such capacitors are non-polar capacitors, their capacity nominal method and digital resistors. Similarly, only some capacitors use an "n". This "n" means 1000, and its position and capacity value are also related. For example, the capacity of a nominal 10n capacitor is 10000pF (that is, 0.01μF). The capacity of the capacitor, which is nominally 4n7, is 4700pF (ie 4.7n) instead of 47000pF. As for the withstand voltage values ​​of these two capacitors, they are marked on the capacitor, such as 65V, 100V, 400V, etc. (Only a few do not mark, but usually also above 65V).
Let me talk about aluminum electrolytic capacitors, which are characterized by large capacity and low cost, so they are widely used in various boards and power boxes, and most peripherals. In order to reduce the production cost, some manufacturers use a lot of capacitors with relatively low withstand voltage values, 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. Only when replacing the capacitor with a withstand voltage value of 1.5 times or more of the actual voltage, but also pay attention to the positive and negative poles can not be reversed, especially the electrolytic capacitor of the power supply part should pay attention to these two points, otherwise it may A capacitor burst event has occurred.
In addition, there is a brand problem in capacitors. The resistance of different brands is only different in error value, but the capacitance of different brands is different in life and quality, such as various loss and insulation resistance and temperature coefficient. Here I will introduce a few good brands to everyone: PHILIPS (Philips), RubyconBLACK GATE (Black Gold), Rubycon (Ruby), ELNA, ROE, SOLEN, Nichicon, DECON, WIMA (this product is very capacitance above 1μF) Expensive), RIFA, ERO, if you really can't recognize it, you just need to remember that all capacitors with C and D letters (all prefixes) on the capacitor should not be bought. Such capacitors are not produced by world famous factories. Even some capacitors used in computer boards can have a bad effect. These capacitors can only be used in products where the performance requirements of the capacitors are not very high (for example, in a radio with 4 yuan), the error in capacity and other performance indicators is very large, even if it is a new factory product. It can guarantee better performance in about 4 years, so it can't be installed in computer accessories at all.
Note: The chip capacitor is mostly gray, and the symbol of the capacitor in the circuit is “C”.