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
RS Stock No. 466-9849
Mfr. Part No.2643000101
BrandFair-Rite
TWD6
Each (In a Pack of 50)
Bead 3.5 x 1.3 x 3.25mm Suppression Components - 43 Material 3.5mm 3.25mm 1.3mm 3.5mm
RS Stock No. 466-9798
Mfr. Part No.2631540002
BrandFair-Rite
TWD40
Each (In a Pack of 5)
Round Cable Core 14.3 x 6.35 x 28.6mm Suppression Components - 31 Material 14.3mm 28.6mm 6.35mm 14.3mm
RS Stock No. 788-0193
Mfr. Part No.7427013
TWD56
Each
Toroid Core 28 x 16 x 13mm EMI Suppression - 3 W 800 13mm 13mm 16mm 28mm
RS Stock No. 647-9907
Mfr. Part No.B64290L0038X830
BrandEPCOS
TWD7
Each (In a Pack of 10)
Ferrite Core 10.8 (Dia.) x 4.75mm - - N30 10.8mm 4.75mm 5.05mm 10.8mm
RS Stock No. 644-1306
Mfr. Part No.HF70BB9.5X10.4X4.9
BrandTDK
TWD13
Each (In a Pack of 10)
Bead 9.5 x 4 x 10.4mm Audio Equipment, Automotive, Computer Peripherals, Digital Interface, EMI Absorption, Imaging Devices, Telecom - Nickel Zinc 9.52mm 10.4mm 4mm 9.5mm
RS Stock No. 257-4395
Mfr. Part No.RT145-102-080-K5B
BrandRichco
TWD22
Each (In a Pack of 5)
Toroid Core 14.5 (Dia.) x 8mm Multi-Turn Suppression Core - K5B 14.5mm 8mm - 14.5mm
RS Stock No. 260-6739
Mfr. Part No.7427015
TWD130
Each
Toroid Core 40.6 27.4 (Dia.) x 15mm General Electronics - 4W620 40.6mm 15mm 27.4mm 40.6mm
RS Stock No. 124-1532
Mfr. Part No.74270090
TWD72
Each (In a Pack of 10)
Axial Ferrite Bead 26 x 13 x 28.5mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 620 - 28.5mm 13mm 26mm
RS Stock No. 174-1421
Mfr. Part No.TX13/7.5/5-3E5
BrandFERROXCUBE
TWD52
Each (In a Pack of 10)
Toroid Core 12.75 x 7.25 x 5.25mm Choke, Current Regulation, Energy Storage, Transformer - Ferrite - 5.25mm 7.25mm 12.75mm
RS Stock No. 840-7226
Mfr. Part No.FS-1RIN-225B-00
BrandBlock
TWD772
Each
- 57.2 x 35.7 x 25.4mm - - Iron Powder 57.2mm 25.4mm 35.7mm 57.2mm
New
RS Stock No. 144-9783
Mfr. Part No.74270033
TWD6
Each (In a Bag of 500)
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
New
RS Stock No. 169-6769
Mfr. Part No.ESD-R-12C
BrandKEMET
TWD18,861
1 Box of 1400
Toroid Core 11.8 x 7.3 x 15mm Consumer Electronics - Nickel Zinc - 15mm 7.3mm 11.8mm
New
RS Stock No. 163-4554
Mfr. Part No.742701707
TWD44
Each (In a Tray of 165)
Toroid Core 20 x 10 x 10mm EMI Suppression - 7 W 850 10mm 10mm 10mm 20mm
New
RS Stock No. 172-9953
Mfr. Part No.2643000701
BrandFair-Rite
TWD4
Each (In a Box of 2500)
Bead 3.5 x 1.3 x 12.7mm Suppression Components - 43 Material 3.5mm 12.7mm 1.3mm 3.5mm
New
RS Stock No. 167-8296
Mfr. Part No.B64290A0084X830
BrandEPCOS
TWD991
Each (In a Box of 12)
Ferrite Core 104.8 x 63.7 x 16.3mm Broadband Transformers, Choke, Mixer, Pulse, Transformer - Copper (Plate), Ferrite (Core) - 16.3mm 63.7mm 104.8mm
RS Stock No. 257-4418
Mfr. Part No.RT165-082-160-K5B
BrandRichco
TWD39
Each (In a Pack of 5)
Toroid Core 16.5 8.2 (Dia.) x 16mm Multi-Turn Suppression Core - K5B 16.5mm 16mm 8.2mm 16.5mm
RS Stock No. 260-6701
Mfr. Part No.74270107
TWD56
Each
Toroid Core 20 (Dia.) x 10mm General Electronics - 3W800 20mm 10mm 10mm 20mm
RS Stock No. 814-3388
Mfr. Part No.TX63/38/25-3E12
BrandFERROXCUBE
TWD883
Each
Ring Core 63.4 x 37.7 x 25.3mm Interference Suppression Coil, Pulse and Wide Band Transformers - 3E12 Material 63.4mm 25.3mm 37.7mm 63.4mm
New
RS Stock No. 169-6776
Mfr. Part No.ESD-R-19D
BrandKEMET
TWD49
Each (In a Box of 480)
Toroid Core 19 x 9 x 11mm Consumer Electronics - Nickel Zinc - 11mm 9mm 19mm
New
RS Stock No. 167-0407
Mfr. Part No.B64290L0044X830
BrandEPCOS
TWD10,322
1 Box of 1500
Ferrite Core 13.6 (Dia.) x 5.95mm - - N30 13.6mm 5.95mm 6.5mm 13.6mm