Choosing The Right Ferrite Core To Increase The Efficiency Of Your Product

Capacitors are often used as noise suppression components. But they are not always the optimal solution because they discharge the noise to the ground. Ferrite cores, however, can suppress noise without grounding.

- Baishakhi Dutta

Ferrites have the ability to attract magnetic flux. Hence, when a cable is passed through a ferrite core, it creates a concentrated magnetic field inside the core, which is eventually converted to heat. This heat gets dissipated along with the magnetic loss of the ferrite, which prevents noise emission. That is how ferrite cores can suppress noise without grounding.

Ferrite cores or ferrite beads are also used in case electromagnetic and radio frequency energies interfere with low-level signals. They dissipate high-frequency energies as minute levels of heat energy and, depending on the nature and frequency of the interference, redirect the EMI/RFI signals back down the cable, away from the devices. For long HDMI and digital cable runs, where the wire passes through areas of strong interference, ferrite cores are effective.