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. 239-062
BrandRS PRO
SGD5.458
Each (In a Pack of 6)
units
Ferrite Core 12.7 (Dia.) x 28.5mm EMI Suppression - Ferrite 28.5mm 28.57mm 13.77mm 28.5mm - - - - -
RS Stock No. 136-9021
BrandRS PRO
SGD20.11
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-9032
BrandRS PRO
SGD8.14
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-8984
BrandRS PRO
SGD9.402
Each (In a Tray of 90)
units
Ferrite Ring 58.3 x 40.8 x 18.6mm - - K 4000 18.6mm 18.6mm 40.8mm 58.3mm - - - - -
RS Stock No. 136-8980
BrandRS PRO
SGD4.484
Each (In a Tray of 140)
units
Ferrite Ring 36 x 23 x 16mm - - K 4000 16mm 16mm 23mm 36mm - - - - -
RS Stock No. 136-8983
BrandRS PRO
SGD11.101
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. 239-056
BrandRS PRO
SGD1.477
Each (In a Pack of 6)
units
Ferrite Core 15.64 x 6.99 x 28.57mm EMI Suppression - Ferrite, Nickel Zinc - 28.57mm 6.99mm 15.64mm - - - - -
RS Stock No. 136-9023
BrandRS PRO
SGD71.17
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-8985
BrandRS PRO
SGD39.27
Each (In a Tray of 8)
units
Ferrite Ring 102 x 65.8 x 16.1mm - - K 4000 16.1mm 16.1mm 65.8mm 102mm - - - - -
RS Stock No. 136-9022
BrandRS PRO
SGD17.04
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-8982
BrandRS PRO
SGD5.098
Each (In a Tray of 112)
units
Ferrite Ring 40 x 24 x 17.1mm - - K 4000 17.1mm 17.1mm 24mm 40mm - - - - -
RS Stock No. 136-9033
BrandRS PRO
SGD9.24
Each
units
- - - - - - - - - - - - - -
RS Stock No. 467-4172
Mfr. Part No.5943003801
BrandFair-Rite
SGD11.15
Each
units
Toroid Core 61 (Dia.) x 12.7mm Inductive Component - 43 Material 61mm 12.7mm 35.55mm 61mm - - - - -
RS Stock No. 124-1536
Mfr. Part No.74270052
SGD1.186
Each (In a Pack of 5)
units
Axial Ferrite Bead 16 x 8 x 16mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 3 W 800 - 16mm 8mm 16mm - - - - -
RS Stock No. 124-1542
Mfr. Part No.74270031
SGD0.912
Each (In a Pack of 10)
units
EMI Suppression Axial Ferrite Bead 11.5 x 5 x 20.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 4 W 1500 - 20.5mm 5mm 11.5mm - - - - -
RS Stock No. 261-8962
Mfr. Part No.TR 31 19 8
BrandRichco
SGD3.94
Each
units
Toroid Core 31.5 x 19.3 x 8mm - - Ferrite - 8mm 19.3mm 31.5mm - - - - -
RS Stock No. 167-8385
Mfr. Part No.B64290L0040X830
BrandEPCOS
SGD10.148
Each (In a Box of 50)
units
Ferrite Core 60.1 x 39.2 x 18.8mm Broadband Transformers, Choke, Mixer, Pulse, Transformer - Ferrite N30 - 18.8mm 39.2mm 60.1mm - - - - -
RS Stock No. 212-0803
Mfr. Part No.B64290L0040X830
BrandEPCOS
SGD15.08
Each
units
Ferrite Core 60.1 x 39.2 x 18.8mm Broadband Transformers, Choke, Mixer, Pulse, Transformer - Ferrite N30 - 18.8mm 39.2mm 60.1mm - - - - -
RS Stock No. 467-4267
Mfr. Part No.5961000601
BrandFair-Rite
SGD1.75
Each (In a Pack of 5)
units
Toroid Core 21 (Dia.) x 6.35mm Inductive Component - 61 Material 21mm 6.35mm 13.2mm 21mm - - - - -
RS Stock No. 167-8299
Mfr. Part No.B64290L0022X830
BrandEPCOS
SGD3.473
Each (In a Box of 100)
units
Toroid Core 41.8 x 26.2 x 12.5mm - - Ferrite 41.8mm 12.5mm 26.2mm 41.8mm - - - - -
Related Products
EPCOS ferrite ring cores are coated with polyamide ...
Description:
EPCOS ferrite ring cores are coated with polyamide or epoxy resin that provides insulation as well as protection for the edges. Suitable applications for these ferrite rings include chokes, baluns, pulse transformers and broadband transformers.
EPCOS ferrite ring cores are coated with polyamide ...
Description:
EPCOS ferrite ring cores are coated with polyamide or epoxy resin that provides insulation as well as protection for the edges. Suitable applications for these ferrite rings include chokes, baluns, pulse transformers and broadband transformers.
Use as a filter for common-mode interference and ...
Description:
Use as a filter for common-mode interference and for common mode and power signal insertion losses. Make sure you have the right impedance for the frequency when you select your ferrite core.For one or more coils. Especially suited for wires, ...
Broad selection with guaranteed impedance specifications over a ...
Description:
Broad selection with guaranteed impedance specifications over a wide frequency range.