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. 167-8333
Mfr. Part No.B64290L0082X830
BrandEPCOS
R 107.412
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. 212-0881
Mfr. Part No.B64290L0082X830
BrandEPCOS
R 294.07
Each
units
Toroid Core 50 (Dia.) x 20mm General Electronics - N30 51.8mm 20mm 28.5mm 51.8mm - - - - -
RS stock no. 163-4554
Mfr. Part No.742701707
R 15.557
Each (In a Tray of 165)
units
Toroid Core 20 x 10 x 10mm EMI Suppression - 7 W 850 10mm 10mm 10mm 20mm - - - - -
RS stock no. 788-0204
Mfr. Part No.742701707
R 20.42
Each (In a Bag of 5)
units
Toroid Core 20 x 10 x 10mm EMI Suppression - 7 W 850 10mm 10mm 10mm 20mm - - - - -
RS stock no. 261-8984
Mfr. Part No.RI 14 6 28
BrandRichco
R 38.88
Each
units
Ferrite Core 14.3 (Dia.) x 28.6mm VE/CD - Ferrite 14.3mm 28.6mm 6.4mm 14.3mm - - - - -
RS stock no. 239-062
BrandRS PRO
R 79.092
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. 617-1259
Mfr. Part No.74270057
R 91.78
Each
units
Ferrite Core 19 (Dia.) x 50.8mm General Electronics - Ferrite - 50.8mm 11.5mm 19mm - - - - -
RS stock no. 212-0803
Mfr. Part No.B64290L0040X830
BrandEPCOS
R 287.91
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. 163-3523
Mfr. Part No.74270057
R 57.20
Each (In a Tray of 60)
units
Ferrite Core 19 (Dia.) x 50.8mm General Electronics - Ferrite - 50.8mm 11.5mm 19mm - - - - -
RS stock no. 167-8385
Mfr. Part No.B64290L0040X830
BrandEPCOS
R 120.879
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. 239-056
BrandRS PRO
R 39.347
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. 788-0190
Mfr. Part No.74270121
R 39.97
Each
units
Toroid Core 19 x 11.5 x 8mm EMI Suppression - 4 W 620 8mm 8mm 11.5mm 19mm - - - - -
RS stock no. 125-3313
Mfr. Part No.B64290L0082X087
BrandEPCOS
R 160.21
Each
units
Toroid Core 51.8 x 28.5 x 21.3mm Automotive Electronics, EMC Components, General Electronics - N87 - 21.3mm 28.5mm 51.8mm - - - - -
RS stock no. 212-0875
Mfr. Part No.B64290L0048X830
BrandEPCOS
R 63.12
Each
units
Toroid Core 35.5 (Dia.) x 13.6mm General Electronics - N30 35.5mm 13.6mm 19.2mm 35.5mm - - - - -
RS stock no. 125-3318
Mfr. Part No.B64290L0618X087
BrandEPCOS
R 15.398
Each (In a Pack of 10)
units
Toroid Core 26.6 x 13.5 x 11mm Automotive Electronics, EMC Components, General Electronics - N87 - 11mm 13.5mm 26.6mm - - - - -
RS stock no. 170-1373
Mfr. Part No.B64290L0618X087
BrandEPCOS
R 11.207
Each (On a Reel of 500)
units
Toroid Core 26.6 x 13.5 x 11mm Automotive Electronics, EMC Components, General Electronics - N87 - 11mm 13.5mm 26.6mm - - - - -
RS stock no. 167-8277
Mfr. Part No.B64290L0048X830
BrandEPCOS
R 43.208
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. 212-0825
Mfr. Part No.B64290L0044X038
BrandEPCOS
R 2.432
Each (In a Pack of 5)
units
Ferrite Core 13.6 (Dia.) x 5.95mm - - T38 13.6mm 5.95mm 6.5mm 12.5mm - - - - -
RS stock no. 163-4548
Mfr. Part No.74270121
R 28.497
Each (In a Tray of 126)
units
Toroid Core 19 x 11.5 x 8mm EMI Suppression - 4 W 620 8mm 8mm 11.5mm 19mm - - - - -
RS stock no. 167-8264
Mfr. Part No.B64290L0044X038
BrandEPCOS
R 3,126.35
1 Box of 1500
Box(es)
Ferrite Core 13.6 (Dia.) x 5.95mm - - T38 13.6mm 5.95mm 6.5mm 12.5mm - - - - -