Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Brief characteristics of metallized film capacitors|Focus on mid-to-high-end brand capacitor manufacturers

by:Shenmao     2021-04-09
Metal film capacitors are metalized film capacitors composed of double-sided metalized polypropylene film and non-metalized polypropylene film that are rolled or laminated. The metal film capacitor has many excellent characteristics, so it is a capacitor with excellent performance. Its main characteristics are as follows: non-polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Based on the above advantages, metal film capacitors are widely used in analog circuits. Especially in the signal cross-connection part, capacitors with good frequency characteristics and extremely low dielectric loss must be used to ensure that the signal will not be too distorted when it is transmitted. Among all plastic film capacitors, polypropylene (PP) capacitors and polystyrene (PS) capacitors have the most remarkable characteristics. Of course, the prices of these two types of capacitors are relatively high. The usual method of making metal film capacitors is to use aluminum and other metal foils as electrodes and plastic films to be overlapped and wound together. However, there is another manufacturing method for film capacitors, called Metallized Film. The method is to deposit a thin layer of metal on a plastic film by vacuum evaporation to serve as an electrode. In this way, the thickness of the electrode foil can be omitted, and the volume of the capacitor per unit capacity can be reduced. Therefore, the metal film capacitor can be easily made into a small and large-capacity capacitor.  Metal film capacitors have the following characteristics: 1. Good heat resistance, rated operating temperature of 70℃, and maximum operating temperature of 155℃. 2. Good voltage stability and small temperature coefficient. 3. The application is very wide, suitable for AC, DC and pulse circuits. Metal film capacitors are non-inductive, wound with polyester film as the dielectric and aluminum foil as the electrode, tinned copper clad steel wire, with epoxy resin encapsulation; 1. Stability and reliability; 2. Non-inductive The structure minimizes the loss factor; 3. Excellent environmental performance. 4. Low ESR. Technical requirements: rated temperature: -40℃~~+85℃; rated voltage: 100V, 250V, 400V, 630V; capacitance range: 0.001UF~~0.47UF; capacitance deviation: ±5%(J), ±10 (K), ±20% (M); Loss tangent angle: 1.0% (max) 1KHz; Withstand voltage: Teminalto (at20±5℃). This product is ideal for industrial and commercial equipment that requires noise reduction and small signal circuits .
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