Film Capacitors

Film capacitors, also known as film dielectric capacitors, are capacitors with a thin plastic film as its dielectric material. An electrical field is created between the two metal traces on the plastic film. The most common type of plastic film in use is polyester, also known as Mylar. The electrical field stores energy, which is then released when needed.

B32529C3472K289 Application Field and Working Principle

The B32529C3472K289 is a surface-mount film capacitor manufactured by EPCOS. It is a MiniBox plastic film capacitor and utilizes a combination of metallized polyester film and aluminum foil with flame-retardant epoxy resin, meeting the EU R10 safety standard. It is mostly used in power supplies, DC to DC conversion, harmonic filters, and EMC applications, as well as for general bypass, blocking, DC link, discharge, and timing purposes.

In terms of its working principle, the B32529C3472K289 acts like a typical capacitor, storing charge and discharging it when necessary. When voltage is applied to the capacitor, some of the electrons are “stored” on one of the two electrodes, creating a charge imbalance. This electric field creates a potential difference between the electrodes, and this potential difference is known as the capacitance. The B32529C3472K289 has a capacitance of 47µF and a maximum working voltage of 250VDC. These specifications make it suitable for EMC applications and power supplies.

The B32529C3472K289 can also be used in series circuits and parallel circuits. In a parallel circuit, the capacitance will increase if additional capacitors are added, while in a series circuit the capacitance will decrease. In either case, the resulting capacitance will be determined by the number and capacitances of the individual capacitors.

The B32529C3472K289 is also highly resistant to temperature changes, making it ideal for use in high temperature applications. It has an insulation resistance of at least 100 megohms from -55 degrees Celsius to +150 degrees Celsius, and its self-healing properties ensure that it will not short circuit even in the presence of minor damage.

Overall, the B32529C3472K289 is a versatile, durable, and reliable film capacitor suitable for a variety of applications. Its superior insulation resistance, wide temperature range, and small size make it ideal for harsh environments and tight spaces. It is an excellent choice for applications requiring robust performance in areas where space is at a premium.