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. 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. 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. 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 - - - - -
RS Stock No. 124-1547
Mfr. Part No.74270113
MYR9.887
Each (In a Pack of 10)
units
EMI Suppression Toroidal Ferrite 11.5 x 5 x 9mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 620 - 9mm 5mm 11.5mm - - - - -
RS Stock No. 163-4549
Mfr. Part No.7427013
MYR10.593
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. 163-3135
Mfr. Part No.74270115
MYR18.436
Each (In a Tray of 40)
units
Toroid Core 31.5 19 (Dia.) x 16mm General Electronics - 3W800 31.5mm 16mm 19mm 31.5mm - - - - -
RS Stock No. 327-5471
Mfr. Part No.74270115
MYR25.03
Each
units
Toroid Core 31.5 19 (Dia.) x 16mm General Electronics - 3W800 31.5mm 16mm 19mm 31.5mm - - - - -
RS Stock No. 788-0193
Mfr. Part No.7427013
MYR8.08
Each
units
Toroid Core 28 x 16 x 13mm EMI Suppression - 3 W 800 13mm 13mm 16mm 28mm - - - - -
RS Stock No. 788-0143
Mfr. Part No.74270097
MYR50.33
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. 163-4540
Mfr. Part No.74270097
MYR35.752
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. 788-0197
Mfr. Part No.74270151
MYR24.36
Each
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. 163-3136
Mfr. Part No.7427015
MYR28.134
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. 260-6739
Mfr. Part No.7427015
MYR19.62
Each
units
Toroid Core 40.6 27.4 (Dia.) x 15mm General Electronics - 4W620 40.6mm 15mm 27.4mm 40.6mm - - - - -
RS Stock No. 163-4550
Mfr. Part No.74270151
MYR21.189
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. 788-0187
Mfr. Part No.74270119
MYR4.032
Each (In a Bag of 5)
units
Toroid Core 22.5 x 13.8 x 6.4mm EMI Suppression - 3 W 800 6.4mm 6.4mm 13.8mm 22.5mm - - - - -
RS Stock No. 163-4546
Mfr. Part No.74270119
MYR3.95
Each (In a Tray of 184)
units
Toroid Core 22.5 x 13.8 x 6.4mm EMI Suppression - 3 W 800 6.4mm 6.4mm 13.8mm 22.5mm - - - - -
RS Stock No. 124-1542
Mfr. Part No.74270031
MYR3.956
Each (In a Pack of 10)
units
EMI Suppression Axial Ferrite Bead 11.5 x 5 x 20.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 1500 - 20.5mm 5mm 11.5mm - - - - -
RS Stock No. 163-4555
Mfr. Part No.74270176
MYR2.537
Each (In a Tray of 500)
units
Toroid Core 10 x 5 x 5mm EMI Suppression - 7 W 850 5mm 5mm 5mm 10mm - - - - -
RS Stock No. 788-0216
Mfr. Part No.74270176
MYR2.554
Each (In a Bag of 5)
units
Toroid Core 10 x 5 x 5mm EMI Suppression - 7 W 850 5mm 5mm 5mm 10mm - - - - -
RS Stock No. 144-9783
Mfr. Part No.74270033
MYR2.636
Each (In a Bag of 500)
units
EMI Suppression Axial Ferrite Bead 9.5 x 4.75 x 9.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 3 W 800 - 9.5mm 4.75mm 9.5mm - - - - -