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. 788-0226
Mfr. Part No.74270191
HK$48.24
Each
units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS Stock No. 124-1849
Mfr. Part No.742701716
HK$8.208
Each (In a Pack of 10)
units
EMI Suppression Toroidal Ferrite 12.7 x 7.9 x 6.35mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 7 W 380 - 6.35mm 7.9mm 12.7mm - - - - -
RS Stock No. 163-4558
Mfr. Part No.74270191
HK$49.42
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. 124-1850
Mfr. Part No.74270117
HK$5.57
Each (In a Pack of 10)
units
EMI Suppression Toroidal Ferrite 14 x 10 x 8mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 3 W 800 - 8mm 10mm 14mm - - - - -
RS Stock No. 163-4540
Mfr. Part No.74270097
HK$59.189
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. 788-0143
Mfr. Part No.74270097
HK$46.22
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. 260-6739
Mfr. Part No.7427015
HK$31.62
Each
units
Toroid Core 40.6 27.4 (Dia.) x 15mm General Electronics - 4W620 40.6mm 15mm 27.4mm 40.6mm - - - - -
RS Stock No. 124-1851
Mfr. Part No.7427011
HK$10.825
Each (In a Pack of 10)
units
EMI Suppression Toroidal Ferrite 16.5 x 8 x 16mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 620 - 16mm 8mm 16.5mm - - - - -
RS Stock No. 124-1535
Mfr. Part No.74270053
HK$9.90
Each (In a Pack of 10)
units
EMI Suppression Axial Ferrite Bead 16 x 8 x 28.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 3 W 800 - 28.5mm 8mm 16mm - - - - -
RS Stock No. 124-1536
Mfr. Part No.74270052
HK$6.994
Each (In a Pack of 5)
units
Axial Ferrite Bead 16 x 8 x 16mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 3 W 800 - 16mm 8mm 16mm - - - - -
RS Stock No. 123-4231
Mfr. Part No.7427727
HK$34.91
Each (In a Pack of 2)
units
EMI Suppression 14.2 x 6.35 x 28.5mm - - - - 28.5mm 6.35mm 14.2mm - - - - -
RS Stock No. 163-3136
Mfr. Part No.7427015
HK$31.044
Each (In a Bag of 30)
units
Toroid Core 40.6 27.4 (Dia.) x 15mm General Electronics - 4W620 40.6mm 15mm 27.4mm 40.6mm - - - - -
RS Stock No. 163-3216
Mfr. Part No.7427727
HK$32.79
Each (In a Tray of 80)
units
EMI Suppression 14.2 x 6.35 x 28.5mm - - - - 28.5mm 6.35mm 14.2mm - - - - -
RS Stock No. 124-1549
Mfr. Part No.74270043
HK$10.35
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 - - - - -
RS Stock No. 124-1537
Mfr. Part No.7427005
HK$9.50
Each (In a Pack of 10)
units
Ferrite Core 16 x 9 x 28mm General Electronics - 4 W 620 16mm 28mm 9mm 16mm - - - - -
RS Stock No. 163-4548
Mfr. Part No.74270121
HK$17.43
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. 788-0193
Mfr. Part No.7427013
HK$13.47
Each
units
Toroid Core 28 x 16 x 13mm EMI Suppression - 3 W 800 13mm 13mm 16mm 28mm - - - - -
RS Stock No. 163-4552
Mfr. Part No.742701703
HK$12.102
Each (In a Tray of 130)
units
Toroid Core 25 x 15 x 12mm EMI Suppression - 7 W 380 12mm 12mm 15mm 25mm - - - - -
RS Stock No. 163-4549
Mfr. Part No.7427013
HK$12.061
Each (In a Tray of 50)
units
Toroid Core 28 x 16 x 13mm EMI Suppression - 3 W 800 13mm 13mm 16mm 28mm - - - - -
RS Stock No. 788-0200
Mfr. Part No.742701703
HK$24.19
Each
units
Toroid Core 25 x 15 x 12mm EMI Suppression - 7 W 380 12mm 12mm 15mm 25mm - - - - -