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. 167-8290
Mfr. Part No.B64290L0659X830
BrandEPCOS
R 55.403
Each (In a Box of 80)
units
Toroid Core 41.8 (Dia.) x 17.2mm - - N30 41.8mm 17.02mm 22.5mm 41.8mm - - - - -
RS stock no. 788-0169
Mfr. Part No.742701112
R 30.63
Each
units
Toroid Core 35.6 x 25.4 x 7.5mm EMI Suppression - 3 W 800 7.5mm 7.5mm 25.4mm 35.6mm - - - - -
RS stock no. 788-0165
Mfr. Part No.742701111
R 39.19
Each
units
Toroid Core 29.5 x 19 x 7.7mm EMI Suppression - 3 W 800 7.7mm 7.7mm 19mm 29.5mm - - - - -
RS stock no. 167-0407
Mfr. Part No.B64290L0044X830
BrandEPCOS
R 3,650.19
1 Box of 1500
Box(es)
Ferrite Core 13.6 (Dia.) x 5.95mm - - N30 13.6mm 5.95mm 6.5mm 13.6mm - - - - -
RS stock no. 163-4544
Mfr. Part No.742701112
R 25.565
Each (In a Tray of 36)
units
Toroid Core 35.6 x 25.4 x 7.5mm EMI Suppression - 3 W 800 7.5mm 7.5mm 25.4mm 35.6mm - - - - -
RS stock no. 170-1365
Mfr. Part No.B64290L0045X038
BrandEPCOS
R 11,885.73
1 Box of 2000
Box(es)
Toroid Core 17.2 x 8.5 x 7.3mm Automotive Electronics, EMC Components, General Electronics - T38 - 7.3mm 8.5mm 17.2mm - - - - -
RS stock no. 467-4554
Mfr. Part No.5978002701
BrandFair-Rite
R 148.376
Each (In a Pack of 5)
units
Toroid Core 35.55 x 23 x 12.7mm Inductive Component - 78 Material 35.55mm 23mm 12.7mm 35.55mm - - - - -
RS stock no. 170-1364
Mfr. Part No.B64290L0044X087
BrandEPCOS
R 1.928
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 - - - - -
RS stock no. 170-1378
Mfr. Part No.B64290L0730X087
BrandEPCOS
R 246.208
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. 172-9974
Mfr. Part No.2843000302
BrandFair-Rite
R 3.954
Each (In a Box of 350)
units
Multi Aperture Core 7.5 x 3.8 x 13.3mm Suppression Components - 43 Material - 13.3mm 3.8mm 7.5mm - - - - -
RS stock no. 265-1773
Mfr. Part No.RI 12 8 15
BrandRichco
R 47.47
Each
units
Ferrite Core 12 (Dia.) x 15mm VE/CD - Ferrite 12mm 15mm 8mm 12mm - - - - -
RS stock no. 163-4550
Mfr. Part No.74270151
R 54.068
Each (In a Tray of 63)
units
Toroid Core 34.6 x 20.8 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 20.8mm 34.6mm - - - - -
RS stock no. 125-3323
Mfr. Part No.B64290L0730X087
BrandEPCOS
R 301.04
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. 260-6571
Mfr. Part No.7427134
R 109.17
Each
units
Split Core 32.8 x 16.4 x 20mm General Electronics - 4W620 32.8mm - 16.4mm 32.8mm - - - - -
RS stock no. 163-4543
Mfr. Part No.742701111
R 31.941
Each (In a Tray of 50)
units
Toroid Core 29.5 x 19 x 7.7mm EMI Suppression - 3 W 800 7.7mm 7.7mm 19mm 29.5mm - - - - -
RS stock no. 257-4430
Mfr. Part No.RT205-102-100-K5B
BrandRichco
R 34.428
Each (In a Pack of 5)
units
Toroid Core 20.5 (Dia.) x 10mm Multi-Turn Suppression Core - K5B 20.5mm 10mm 10.2mm 20.5mm - - - - -
RS stock no. 788-0143
Mfr. Part No.74270097
R 130.03
Each
units
Toroid Core 61 x 35.5 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 35.5mm 61mm - - - - -
RS stock no. 788-0226
Mfr. Part No.74270191
R 109.51
Each
units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS stock no. 163-4540
Mfr. Part No.74270097
R 113.857
Each (In a Tray of 15)
units
Toroid Core 61 x 35.5 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 35.5mm 61mm - - - - -
RS stock no. 467-4166
Mfr. Part No.5943001901
BrandFair-Rite
R 3.586
Each (In a Pack of 10)
units
Toroid Core 12.7 (Dia.) x 12.7mm Inductive Component - 43 Material 12.7mm 12.7mm 7.9mm 12.7mm - - - - -