SPA151M04B

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Aluminum- polymer capacitors are an important energy storage device used in a wide variety of applications. When first introduced in the early 1970’s, they were considered a breakthrough technology at the time. Major advancements in material science and design have been made since then, notably with the introduction of the SPA151M04B aluminum-polymer capacitor in 2015.

The SPA151M04B is a surface mount aluminum-polymer capacitor with a C-R-C profile, rated at 4.7V. Its capacitance range is 10-470uF, with tolerances of +/-20%. This capacitor offers significantly improved electrical characteristics compared to the traditional electrolytic capacitor, while also taking up a much smaller footprint. It also has a longer life expectancy, up to 8,000 hours at rated temperature.

The SPA151M04B aluminum-polymer capacitor is designed for use in high power Pulse Power applications, as well as for general-purpose capacitive applications. Its low equivalent series resistance and ultra-low ESR makes it ideal for DC-DC converters and battery management systems, as well as other power sensitive circuit applications. As it is a sealed type capacitor, it also has reduced risk of environmental problems and increased safety.

When considering the working principle of an aluminum-polymer capacitor, it is important to note that its capacitance is dependent on the type and structure of the material used in its dielectric layer. Generally, aluminum-polymer capacitors feature a highly conductive anode layer composed of the aluminum metal, a non-conductive spacer layer, and an electrically conductive polymeric layer. The non-conductive spacer layer is typically polypropylene, polyamide, polyethylene terephthalate, polyfluoroethylene, polyethylene naphthalate, polyimide, polycarbonate, polyvinylene carbonate, polytetrafluoroethane, or polybenzazole.

The polymeric layer consists of a polypyrrole, polybithiophene, polyaniline, polyphthalocyanine, polythienoacene, polyparaphenylenevinylene, or poly(phenylene ethynylene) material, which provides the capacitance. The polymer layer also serves as a separating layer between the electrodes, and provides an electrical connection to the anode, allowing the current to flow when a potential difference is applied. Furthermore, this polymer layer also serves to reduce the ESR and the effective Equivalent Series Resistance of the capacitor.

In operation, and when a voltage is applied, the capacitor charges up and stores energy. The effectiveness of the capacitor is determined by its capacitance. The capacitance is directly proportional to the thickness of the polymer layer, and decreases with increasing temperature. This is why the SPA151M04B aluminum-polymer capacitor is designed with a higher tolerance for temperature, enabling it to withstand higher temperatures and still maintain its capacitance rating.

Aluminum-polymer capacitors are typically used in applications that require high pulse power, such as in motor control, power supplies, DC-DC converters, and current limiters. They are also used in RFID and EMI shielding, in filter networks, and in charged-coupled devices. Other applications include automotive, aerospace, and medical electronic equipment.

The SPA151M04B aluminum-polymer capacitor is a reliable and efficient energy storage device, and one that offers improved electrical characteristics over traditional capacitors. Its superior capacitance, and its ability to withstand higher temperatures and operate in a wide range of applications make it a highly sought after capacitor device.

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