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. 163-4548
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. 467-4239
Mfr. Part No.5961000201
BrandFair-Rite
R 7.003
Each (In a Pack of 25)
units
Toroid Core 9.5 (Dia.) x 3.3mm Inductive Component - 61 Material 9.5mm 3.3mm 4.75mm 9.5mm - - - - -
RS stock no. 467-4172
Mfr. Part No.5943003801
BrandFair-Rite
R 203.59
Each
units
Toroid Core 61 (Dia.) x 12.7mm Inductive Component - 43 Material 61mm 12.7mm 35.55mm 61mm - - - - -
RS stock no. 174-1364
Mfr. Part No.TN14/9/5-3E25
BrandFERROXCUBE
R 13.195
Each (In a Pack of 10)
units
Toroid Core 14.6 x 8.2 x 5.5mm Choke, Current Regulation, Energy Storage, Transformer - Ferrite - 5.5mm 8.2mm 14.6mm - - - - -
RS stock no. 467-4144
Mfr. Part No.5943001001
BrandFair-Rite
R 30.252
Each (In a Pack of 5)
units
- 29 x 19 x 7.5mm - - 43 Material 29mm 7.5mm 19mm 29mm - - - - -
RS stock no. 163-3137
Mfr. Part No.7427133
R 62.081
Each (In a Tray of 24)
units
Split Core 32.8 x 16.4 x 13mm General Electronics - 4W620 32.8mm - 16.4mm 32.8mm - - - - -
RS stock no. 163-4555
Mfr. Part No.74270176
R 5.639
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. 788-0162
Mfr. Part No.742701110
R 39.22
Each
units
Toroid Core 28 x 18 x 7.5mm EMI Suppression - 3 W 800 7.5mm 7.5mm 18mm 28mm - - - - -
RS stock no. 212-0910
Mfr. Part No.B64290L0618X035
BrandEPCOS
R 21.668
Each (In a Pack of 5)
units
Ferrite Core 25.3 (Dia.) x 14.8 x 10mm - - T35 25.3mm 10mm 14.8mm 25.3mm - - - - -
RS stock no. 163-4557
Mfr. Part No.74270182
R 33.668
Each (In a Tray of 126)
units
Toroid Core 18.6 x 10.2 x 10mm EMI Suppression - 4 W 1500 10mm 10mm 10.2mm 18.6mm - - - - -
RS stock no. 260-6559
Mfr. Part No.7427133
R 68.61
Each
units
Split Core 32.8 x 16.4 x 13mm General Electronics - 4W620 32.8mm - 16.4mm 32.8mm - - - - -
RS stock no. 788-0222
Mfr. Part No.74270182
R 43.31
Each
units
Toroid Core 18.6 x 10.2 x 10mm EMI Suppression - 4 W 1500 10mm 10mm 10.2mm 18.6mm - - - - -
RS stock no. 467-3090
Mfr. Part No.2661021801
BrandFair-Rite
R 2.974
Each (In a Pack of 25)
units
EMI Suppression 5.1 x 1.45 x 11.1mm EMI Suppression - 61 Material 5.1mm 11.1mm 1.45mm 5.1mm - - - - -
RS stock no. 172-9966
Mfr. Part No.2661021801
BrandFair-Rite
R 3.114
Each (In a Box of 800)
units
EMI Suppression 5.1 x 1.45 x 11.1mm EMI Suppression - 61 Material 5.1mm 11.1mm 1.45mm 5.1mm - - - - -
RS stock no. 467-4267
Mfr. Part No.5961000601
BrandFair-Rite
R 16.458
Each (In a Pack of 5)
units
Toroid Core 21 (Dia.) x 6.35mm Inductive Component - 61 Material 21mm 6.35mm 13.2mm 21mm - - - - -
RS stock no. 163-4542
Mfr. Part No.742701110
R 30.392
Each (In a Tray of 60)
units
Toroid Core 28 x 18 x 7.5mm EMI Suppression - 3 W 800 7.5mm 7.5mm 18mm 28mm - - - - -
RS stock no. 482-6575
Mfr. Part No.5943001101
BrandFair-Rite
R 5.61
Each (In a Pack of 5)
units
Toroid Core 12.7 (Dia.) x 6.35mm Inductive Component - 43 Material 12.7mm 6.35mm 7.9mm 12.7mm - - - - -
RS stock no. 167-8376
Mfr. Part No.B64290L0618X035
BrandEPCOS
R 11.25
Each (In a Box of 500)
units
Ferrite Core 25.3 (Dia.) x 14.8 x 10mm - - T35 25.3mm 10mm 14.8mm 25.3mm - - - - -
RS stock no. 371-7379
Mfr. Part No.HF70T18X10X10
BrandTDK
R 10.021
Each (In a Pack of 10)
units
EMI Suppression Toroid Core 18 x 10 x 10mm Round Cable - HF70 18mm 10mm 10mm 18mm - - - - -
RS stock no. 814-3385
Mfr. Part No.TX63/38/25-3E10
BrandFERROXCUBE
R 369.30
Each
units
Ring Core 63.4 x 37.7 x 25.3mm Interference Suppression Coil, Pulse and Wide Band Transformers - 3E10 Material 63.4mm 25.3mm 37.7mm 63.4mm - - - - -