Solid capacitors full name: solid aluminum electrolytic capacitors. It is the biggest difference with the ordinary capacitance (ie, liquid aluminum electrolytic capacitors) that used different dielectric material, liquid aluminum capacitor dielectric material as the electrolyte, and solid capacitor dielectric material was conductive polymer. For often go to Internet cafes or prolonged use of computer friends, you must have had or heard of since the card capacitances cause computer instability and even burst capacitance thing! That is because on the one hand the board in prolonged use, the thermal expansion of the electrolyte overheating, causing capacitor useless even cause swelling due to exceeding the boiling point of bursting! On the other hand, if the board in the case of long-term no electricity, the electrolyte is easy to form a chemical reaction with aluminum, causing the explosion phenomena in the boot or power. However, if the use of solid capacitors, it is no such risk and danger!
Because solid capacitors with conductive polymer products as a dielectric material, which does not have an effect with alumina, power and explosion Buzhi Yu phenomenon; the same time it is a solid product, the nature does not exist due to the thermal expansion lead to burst situation. Solid capacitors with environmental protection, low impedance, high temperature stability, high reliability and high ripple and other superior characteristics, is the most high-end products in the electrolytic capacitor products. Since the capacitance characteristics far superior to liquid-solid aluminum capacitors, solid capacitors the temperature reached 260 degrees, and the electrical conductivity, the frequency characteristics and life are good for low voltage, high current applications, mainly used in digital products such as slim DVD, projector machines and computers and other industries, in recent years, has also been widely used in PC card products.
Conclusion: In fact, electrolytic capacitors and chip capacitors described above is essentially no different, the only difference between them is in the package or above the welding process, either plug-in or patch installation process, capacitors are themselves upright in PCB, the fundamental difference between the way SMT chip technology installed capacitance, with black rubber base. The main advantage is that SMT production, its high degree of automation, accuracy is also high, the plug-in transit not as easily damaged. However, SMT chip technology is installed, you need to wave soldering process, after high temperature capacitors can affect performance, especially the use of cathode electrolyte capacitors, after high temperature electrolyte may be dry. Low installation cost plug-in technology, and therefore at the same cost, the performance of the capacitor itself can be better. Due to the low cost machinery factory in Europe and America artificially more expensive, so most tend SMT chip manufacturing. Domestic factory labor cheaper, so manufacturers prefer to use a plug-in installation.