F320J107MBA Capacitors

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Tantalum-Polymer Capacitors, such as the F320J107MBA, are the premier choice for applications requiring both high capacitance and miniaturization. In comparison to aluminum electrolytic capacitors, Tantalum-Polymer Capacitors achieve much greater capacitance from a package that is a fraction of the size. Nevertheless, such small packages do not come without drawbacks, having limited ripple current carrying capacity due to their construction.

The F320J107MBA is a miniature mold construction surface mount, tantalum-polymer capacitor capable of a maximum capacitance of 330 µF with a long term voltage rating of 4V. This specific device is non-polarized, and includes both a surge current guard ring, and a unique self-healing design. In addition, the F320J107MBA can tolerate up to +105°C ambient temperature.

The construction of this tantalum-polymer capacitor type consists of several layers of different materials, sandwiched together like a sandwich. The Tanatlum-Polymer Capacitor begins with an anode layer made from tantalum constructed in a powder form, rather than as a foil deposit as in aluminum electrolytic capacitors. The anode is then covered with a dielectric layer of very thin polymer-film dielectric material such as polyethyleneterephthalate, or PET. Following this is a second layer of Tantalum powder which functions as the cathode. A thick, gas and moisture porous, “guard” layer is the final element, housing internal pressure relief, and providing additional safety against shorts and arcs. Taken together, these layers, which have diameters of as small as 2.5 mm, essentially form the device.

The working principle of any tantalum-polymer capacitor is simple. Upon application of a potential difference between the anode and cathode, electron current flows between the two electrodes, creating a microscopic electric field and a corresponding accumulation of electric charge. This charge is stored in the form of an electrostatic field. This occurs in a proportion determined by the dielectric’s permittivity and the effective spacing of the two electrodes. As more charge is placed on the capacitor, the electric field increases and a greater proportion of the electrons’ energy is eventually converted and stored in the form of electrostatic energy, with any dissipated energy forming heat.

These characteristics make the F320J107MBA ideal for continuous usage in applications such as controlling the voltage of static RAM and ROM circuits, providing power to microprocessors and other integrated circuits, buffering the power supply against fast transient, and for use in blocking, bypass and decoupling filters. In addition, these characteristics make the device resistant to surge current and transient loads, thereby providing longer life and a greater levels of reliability in comparison to other capacitor technologies.

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