Ferrite Rings

Ferrite rings are toroidal (doughnut) shaped, or cylindrical shaped pieces of ferrite (a ceramic compound).
What do they do?
Ferrite rings help to protect against EMI (electromagnetic interference) and RFI (radio frequency interference). They prevent interference moving to a device or from a device.
How do they work?
Ferrite rings can suppress noise without grounding. Ferrites are able to attract magnetic flux. When a cable is passed through the ring, the magnetic fields created by the cable are concentrated within the ferrite ring. This magnetic energy is converted to heat and the ferrite dissipates this by magnetic loss.
How are they used?
Ferrite rings can often be seen with cables threaded through them. They are common place in electronics to help with noise suppression. The cable can also be wrapped about the ferrite ring numerous times. Ferrite rings can be incorporated into broadband transformers, pulse transformers and common mode chokes.

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Description Price Type Dimensions Application Impedance Material Diameter Height Inner Diameter Outer Diameter Outer Dimensions Inner Dimensions Outer Height Series Aperture Diameter
RS stock no. 151-2731
Mfr. Part No.2675626402
BrandFair-Rite
R 22.187
Each (In a Tray of 376)
units
Round Cable Core 18.7 x 10.15 x 28.6mm EMI Suppression 24 Ω @ 200 KHz 75 Material 18.7mm 28.6mm 10.15mm 18.7mm - - - - -
RS stock no. 169-6772
Mfr. Part No.ESD-R-14C
BrandKEMET
R 10,708.81
Each (In a Box of 6000)
units
Ferrite Core - Consumer Electronics - Ferrite - - - - - - - - -
RS stock no. 170-1372
Mfr. Part No.B64290L0618X038
BrandEPCOS
R 15.069
Each (On a Reel of 500)
units
Toroid Core 26.6 x 13.5 x 11mm Automotive Electronics, EMC Components, General Electronics - T38 - 11mm 13.5mm 26.6mm - - - - -
RS stock no. 466-9798
Mfr. Part No.2631540002
BrandFair-Rite
R 21.368
Each (In a Pack of 5)
units
Round Cable Core 14.3 x 6.35 x 28.6mm Suppression Components - 31 Material 14.3mm 28.6mm 6.35mm 14.3mm - - - - -
RS stock no. 125-3316
Mfr. Part No.B64290L0618X037
BrandEPCOS
R 17.175
Each (In a Pack of 10)
units
Toroid Core 26.6 x 13.5 x 11mm Automotive Electronics, EMC Components, General Electronics - T37 - 11mm 13.5mm 26.6mm - - - - -
RS stock no. 124-1853
Mfr. Part No.74270111
R 8.414
Each (In a Pack of 10)
units
Toroid Core 7.3 x 3.3 x 4.3mm EMI Suppression - 4 W 620 - 4.3mm 3.3mm 7.3mm - - - - -
RS stock no. 136-8983
BrandRS PRO
R 107.175
Each (In a Tray of 90)
units
Ferrite Ring 50 x 30 x 21.1mm - - K 4000 21.1mm 21.1mm 30mm 50mm - - - - -
RS stock no. 170-1371
Mfr. Part No.B64290L0618X037
BrandEPCOS
R 19.245
Each (On a Reel of 500)
units
Toroid Core 26.6 x 13.5 x 11mm Automotive Electronics, EMC Components, General Electronics - T37 - 11mm 13.5mm 26.6mm - - - - -
RS stock no. 811-9014
Mfr. Part No.ESD-R-19D
BrandKEMET
R 10.646
Each (In a Bag of 5)
units
Toroid Core 19 x 9 x 11mm Consumer Electronics - Nickel Zinc - 11mm 9mm 19mm - - - - -
RS stock no. 151-2787
Mfr. Part No.2675102002
BrandFair-Rite
R 45.00
Each (In a Pack of 3)
units
Round Cable Core 25.9 x 12.8 x 28.6mm EMI Suppression 30 Ω @ 200 KHz 75 Material 25.9mm 28.6mm 12.8mm 25.9mm - - - - -
RS stock no. 124-1854
Mfr. Part No.742701121
R 8.007
Each (In a Pack of 20)
units
EMI Suppression Toroidal Ferrite 9.5 x 5 x 14.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 620 - 14.5mm 5mm 9.5mm - - - - -