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. 167-8385
Mfr. Part No.B64290L0040X830
BrandEPCOS
$10.159
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
$14.00
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. 212-0875
Mfr. Part No.B64290L0048X830
BrandEPCOS
$3.82
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
$2.97
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. 212-0881
Mfr. Part No.B64290L0082X830
BrandEPCOS
$12.79
Each
units
Toroid Core 50 (Dia.) x 20mm General Electronics - N30 51.8mm 20mm 28.5mm 51.8mm - - - - -
RS Stock No. 167-8333
Mfr. Part No.B64290L0082X830
BrandEPCOS
$8.70
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. 170-1369
Mfr. Part No.B64290L0084X087
BrandEPCOS
$35.34
Each (On a Reel of 12)
units
Toroid Core 104.8 x 63.7 x 16.5mm Automotive Electronics, EMC Components, General Electronics - N87 - 16.5mm 63.7mm 104.8mm - - - - -
RS Stock No. 125-3314
Mfr. Part No.B64290L0084X087
BrandEPCOS
$35.67
Each
units
Toroid Core 104.8 x 63.7 x 16.5mm Automotive Electronics, EMC Components, General Electronics - N87 - 16.5mm 63.7mm 104.8mm - - - - -
RS Stock No. 212-0982
Mfr. Part No.B64290L0674X830
BrandEPCOS
$4.10
Each
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
$24.94
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. 290-6219
Mfr. Part No.B64290L0022X830
BrandEPCOS
$6.27
Each
units
Toroid Core 41.8 x 26.2 x 12.5mm - - Ferrite 41.8mm 12.5mm 26.2mm 41.8mm - - - - -
RS Stock No. 167-8299
Mfr. Part No.B64290L0022X830
BrandEPCOS
$3.476
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. 212-0718
Mfr. Part No.B64290A0084X830
BrandEPCOS
$24.67
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. 167-8285
Mfr. Part No.B64290L0674X830
BrandEPCOS
$3.861
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. 125-3323
Mfr. Part No.B64290L0730X087
BrandEPCOS
$27.46
Each
units
Toroid Core 89.3 x 52.4 x 14.8mm Automotive Electronics, EMC Components, General Electronics - N87 - 14.8mm 52.4mm 89.3mm - - - - -
RS Stock No. 170-1378
Mfr. Part No.B64290L0730X087
BrandEPCOS
$26.63
Each (On a Reel of 12)
units
Toroid Core 89.3 x 52.4 x 14.8mm Automotive Electronics, EMC Components, General Electronics - N87 - 14.8mm 52.4mm 89.3mm - - - - -
RS Stock No. 212-0926
Mfr. Part No.B64290L0618X830
BrandEPCOS
$1.77
Each (In a Pack of 5)
units
Toroid Core 26.6 (Dia.) x 11mm General Electronics - N30 26.8mm 11mm 13.5mm 26.6mm - - - - -
RS Stock No. 167-8284
Mfr. Part No.B64290P0037X830
BrandEPCOS
$998.80
1 Box of 4000
Box(es)
Ferrite Core 6.3 (Dia.) x 2.5mm General Electronics - N30 6.3mm 2.5mm - 6.3mm - - - - -
RS Stock No. 212-0774
Mfr. Part No.B64290P0037X830
BrandEPCOS
$0.618
Each (In a Pack of 5)
units
Ferrite Core 6.3 (Dia.) x 2.5mm General Electronics - N30 6.3mm 2.5mm - 6.3mm - - - - -
RS Stock No. 170-1364
Mfr. Part No.B64290L0044X087
BrandEPCOS
$0.174
Each (On a Reel of 1500)
units
Toroid Core 13.6 x 6.5 x 5.95mm Automotive Electronics, EMC Components, General Electronics - N87 - 5.95mm 6.5mm 13.6mm - - - - -