What are feed through capacitors?
Feedthrough capacitors are a special type of capacitors that are uniquely designed to meet the performance requirements of filtering circuits. A typical feedthrough capacitor consists of an electrode passing through the centre of a grounded housing.
How does a capacitor feed work?
Feedthrough capacitors have a structure in which the ground electrode surrounds the dielectric and the signal terminal goes through the dielectric. Feedthrough capacitors are used by making a mounting hole in the shielding case and soldering the ground electrode directly to the shielding case (plate).
How are feedthrough capacitors used in a circuit?
Apart from filtering applications, feedthrough capacitors are also commonly used as bypass components in circuits. Feedthrough capacitors are used in a wide range of circuits including EMI/RFI suppression circuits, power converters, and power supplies.
What are the negative effects of plastic feedthrough capacitors?
Plastic film feedthrough capacitors are available in a broad array of ratings and capacitance-voltage combinations. Heat can significantly reduce the life and reliability of plastic film capacitors. Most manufacturers of film feedthrough capacitors are producing solderless components to eliminate the negative effects of soldering.
Why are discoidal feedthrough capacitors used in EMI filters?
Discoidal feedthrough capacitors are widely used in the EMI filter industry. These components come in different designs and in a wide range of capacitance ratings to meet the diverse requirements of today’s applications. In addition, most of these components are compact in size and have impressive dielectric strength.
Why is shunt inductance important in filter capacitors?
In filtering applications, shunt inductance can significantly lower the filtering performance of a component. The series inductance in feedthrough capacitors ensures that these components have outstanding high frequency performance.