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. 212-0982
Mfr. Part No.B64290L0674X830
BrandEPCOS
MYR15.14
Each
units
Toroid Core 37.5 (Dia.) x 16.2mm General Electronics - N30 37.5mm 16.2mm 23mm 37.5mm - - - - -
RS Stock No. 167-8285
Mfr. Part No.B64290L0674X830
BrandEPCOS
MYR12.635
Each (In a Box of 100)
units
Toroid Core 37.5 (Dia.) x 16.2mm General Electronics - N30 37.5mm 16.2mm 23mm 37.5mm - - - - -
RS Stock No. 167-8296
Mfr. Part No.B64290A0084X830
BrandEPCOS
MYR128.043
Each (In a Box of 12)
units
Ferrite Core 104.8 x 63.7 x 16.3mm Broadband Transformers, Choke, Mixer, Pulse, Transformer - Copper (Plate), Ferrite (Core) - 16.3mm 63.7mm 104.8mm - - - - -
RS Stock No. 212-0718
Mfr. Part No.B64290A0084X830
BrandEPCOS
MYR128.15
Each
units
Ferrite Core 104.8 x 63.7 x 16.3mm Broadband Transformers, Choke, Mixer, Pulse, Transformer - Copper (Plate), Ferrite (Core) - 16.3mm 63.7mm 104.8mm - - - - -
RS Stock No. 212-0803
Mfr. Part No.B64290L0040X830
BrandEPCOS
MYR62.89
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. 167-8385
Mfr. Part No.B64290L0040X830
BrandEPCOS
MYR38.903
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. 170-1372
Mfr. Part No.B64290L0618X038
BrandEPCOS
MYR5.363
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. 467-4172
Mfr. Part No.5943003801
BrandFair-Rite
MYR35.33
Each
units
Toroid Core 61 (Dia.) x 12.7mm Inductive Component - 43 Material 61mm 12.7mm 35.55mm 61mm - - - - -
RS Stock No. 125-3317
Mfr. Part No.B64290L0618X038
BrandEPCOS
MYR6.231
Each (In a Pack of 10)
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. 167-8333
Mfr. Part No.B64290L0082X830
BrandEPCOS
MYR40.965
Each (In a Box of 40)
units
Toroid Core 50 (Dia.) x 30mm General Electronics - N30 51.8mm 30mm 28.5mm 51.8mm - - - - -
RS Stock No. 788-0226
Mfr. Part No.74270191
MYR34.63
Each
units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS Stock No. 212-0881
Mfr. Part No.B64290L0082X830
BrandEPCOS
MYR50.46
Each
units
Toroid Core 50 (Dia.) x 20mm General Electronics - N30 51.8mm 20mm 28.5mm 51.8mm - - - - -
RS Stock No. 163-4558
Mfr. Part No.74270191
MYR33.049
Each (In a Tray of 15)
units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS Stock No. 644-1261
Mfr. Part No.HF70BB6.4X5X3.2
BrandTDK
MYR0.706
Each (In a Pack of 10)
units
Bead 6.4 x 3.2 x 5mm Audio Equipment, Automotive, Computer Peripherals, Digital Interface, EMI Absorption, Imaging Devices, Telecom - Nickel Zinc 6.4mm 5mm 3.2mm 6.4mm - - - - -
RS Stock No. 467-5074
Mfr. Part No.2643665702
BrandFair-Rite
MYR5.97
Each (In a Pack of 5)
units
Round Cable Core 17.45 x 9.5 x 28.6mm Suppression Components - 43 Material 17.45mm 28.6mm 9.5mm 17.45mm - - - - -
RS Stock No. 167-8299
Mfr. Part No.B64290L0022X830
BrandEPCOS
MYR16.27
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 - - - - -
RS Stock No. 290-6219
Mfr. Part No.B64290L0022X830
BrandEPCOS
MYR15.49
Each
units
Toroid Core 41.8 x 26.2 x 12.5mm - - Ferrite 41.8mm 12.5mm 26.2mm 41.8mm - - - - -
RS Stock No. 212-0875
Mfr. Part No.B64290L0048X830
BrandEPCOS
MYR21.71
Each
units
Toroid Core 35.5 (Dia.) x 13.6mm General Electronics - N30 35.5mm 13.6mm 19.2mm 35.5mm - - - - -
RS Stock No. 167-8277
Mfr. Part No.B64290L0048X830
BrandEPCOS
MYR9.718
Each (In a Box of 100)
units
Toroid Core 35.5 (Dia.) x 13.6mm General Electronics - N30 35.5mm 13.6mm 19.2mm 35.5mm - - - - -
RS Stock No. 124-1549
Mfr. Part No.74270043
MYR14.176
Each (In a Pack of 5)
units
EMI Suppression Axial Ferrite Bead 15.5 x 7.3 x 28.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 3 W 800 - 28.5mm 7.3mm 15.5mm - - - - -
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