SFBLL1000223MX0

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Feed Through Capacitors

Feed through capacitors, such as the SFBLL1000223MX0, are used to pass high-frequency signals between two circuit boards without introducing them into the ground potential of one or both boards. As a result, feed through capacitors provide an electrical connection between two circuit boards, with very low impedance over a wide frequency range.

The main application field for feed through capacitors is EMC/EMI shielding. With their low impedance characteristics, these capacitors allow high-frequency signals to be passed between two closely spaced boards, while maintaining an effective electrostatic screen between them. This helps reduce the amount of electromagnetic interference (EMI) generated, by preventing the boards from interacting electrically;which in turn can help improve the overall system performance.

Another application for these capacitors is power line noise suppression. The low impedance characteristics of the feed through capacitor allow it to effectively reduce the amount of power line noise that is conducted between two boards. This helps reduce the amount of interference caused by power line noise, which can be critical in some applications where power line noise can negatively impact system performance.

The working principle of feed through capacitors is based on the mutual capacitance. This is the same principle as a regular capacitor, where two electrodes are separated by a dielectric material. The difference is that in a feed through capacitor, the electrodes are connected to the two circuit boards, which creates a capacitor between the two boards. The capacitor then passes high-frequency signals between the two boards, while blocking any low-frequency currents.

This makes feed through capacitors a powerful tool for noise suppression in EMI environments. As the capacitor blocks low-frequency signals, it reduces the amount of current that can be conducted between two boards. This helps reduce the amount of electromagnetic interference that can be generated, allowing for improved system performance with reduced interference.

In addition, the capacitors can also provide a very low impedance path for high-frequency signals, so they can be effectively passed between the two boards without significant loss. This makes them a very effective way to pass high-frequency signals between two boards, while still maintaining effective electrostatic shielding between them.

Feed through capacitors, such as the SFBLL1000223MX0, are an important component for any EMC/EMI shielded system. With their ability to reduce high frequency interference and provide low impedance paths for high frequency signals, they help ensure that the system operates correctly and efficiently, with minimal interference.

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