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Plug-in and SMD aluminum electrolytic capacitor encapsulation

by:SMiLer     2021-02-22
Whether mobile phone or computer or electrical products and equipment, many can only cannot leave the capacitance in the movement. Capacitance type, different capacitance presents the function and the applicable conditions are different. And SMD aluminum electrolytic capacitor is one of the most common capacitance. And its no pressure value and encapsulation are difference with plug-in capacitance. Patch of electrolytic capacitor encapsulation electrolytic capacitors: can be divided into two categories, nonpolar and polar and nonpolar capacitance the following two types of packaging are the most common, namely, 0805, 0603; And polar capacitor also is what we usually call electrolytic capacitor, we usually use most commonly for aluminium electrolytic capacitor, due to its electrolyte for aluminum, so the temperature stability and accuracy is not high, the patch components due to its close to the circuit board, so it requires high temperature stability, so the patch capacitance to tantalum capacitor. Electrolytic capacitor encapsulation model for the RB series, such as from RB - 。 2 /. 4 to RB - 。 5 /. 10, the suffix of the first number said encapsulated in the model the distance between two bonding pad, the second figures show that the capacitance of the appearance, size, the unit is inch next to simply analyze the difference between the two. For SMD aluminum electrolytic capacitor encapsulation, the cathode is the electrolyte materials used, this is also our sees most of the most widely used capacitance. It features: first, the patch capacitance and floor is to use soldering death, at the bottom of the capacitance and floor tightly to die, completely without any gap; Second, no solder on the back of PCB, and thus the possibility of no cause a short-circuit. And from the production process, patch type capacitance and plug-in capacitance compared with its costs will be much higher. Caused due to the different craft difficulty level is different, and it also makes the sales price of the plugin capacitance of the patch higher. In addition, on the packaging, packaging methods used by both is also different. Relatively speaking, the high cost of SMD aluminum electrolytic capacitor encapsulation, the protection of capacitor is stronger. Relatively speaking, both can be judged from whether there is a rubber base belongs to which kinds of encapsulation. This is the main standard to distinguish the two packaging and basis. SMD aluminum electrolytic capacitor with a plug-in packaging there is a difference. Aluminum electrolytic capacitor displays the following obvious characteristics: (in the structure 1) The working medium of aluminum electrolytic capacitor is generated by means of anodic oxidation on aluminum foil surface a thin layer of 3 oxidation 2 aluminium ( 氧化铝) The oxide dielectric layer and the capacitor anode combined into a complete system, both are interdependent, not independent of each other; We say normally capacitor, the electrode and electrolyte are independent of each other. ( 2) Aluminum electrolytic capacitor anode is generated on the surface of Al2O3 dielectric layer of aluminum foil, cathode is not we traditionally think of negative foil, but the electrolytic capacitor. ( 3) Negative foil electrical lead role in the electrolytic capacitor, because as electrolytic capacitor cathode electrolyte cannot directly and external connection, must pass a metal electrode and the rest of the circuit form electrical pathway. ( 4) Anode foil of aluminum electrolytic capacitor, corrosion of cathode aluminium foil were usually aluminum foil, the actual surface area is much greater than the apparent surface area, which is usually has a large aluminum electrolytic capacitor of capacitance of a reason. Because use aluminum foil with thousands of fine corrosion holes, usually need liquid electrolyte to more effectively use its actual electrode area. ( 5) Due to the dielectric oxide film of aluminum electrolytic capacitor is by means of anodic oxidation, and its thickness is proportional to imposed by the anodic oxidation voltage, so, in principle, aluminum electrolytic capacitor dielectric layer thickness can be artificially controlled accurately.
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