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. 124-1532
Mfr. Part No.74270090
TWD72
Each (In a Pack of 10)
units
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. 124-1544
Mfr. Part No.7427012
TWD40
Each (In a Pack of 10)
units
EMI Suppression Toroidal Ferrite 23.5 x 12.6 x 14mm Coaxial Cable, Multiconductor Wire, Wire-Wrapping Cable, Wires - 4 W 620 - 14mm 12.6mm 23.5mm - - - - -
RS Stock No. 172-9943
Mfr. Part No.2643000101
BrandFair-Rite
TWD2
Each (In a Box of 43)
units
Bead 3.5 x 1.3 x 3.25mm Suppression Components - 43 Material 3.5mm 3.25mm 1.3mm 3.5mm - - - - -
RS Stock No. 466-9849
Mfr. Part No.2643000101
BrandFair-Rite
TWD5
Each (In a Pack of 50)
units
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)
units
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. 172-9989
Mfr. Part No.2631540002
BrandFair-Rite
TWD51
Each (In a Box of 376)
units
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. 163-4549
Mfr. Part No.7427013
TWD82
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. 788-0193
Mfr. Part No.7427013
TWD56
Each
units
Toroid Core 28 x 16 x 13mm EMI Suppression - 3 W 800 13mm 13mm 16mm 28mm - - - - -
RS Stock No. 260-6739
Mfr. Part No.7427015
TWD130
Each
units
Toroid Core 40.6 27.4 (Dia.) x 15mm General Electronics - 4W620 40.6mm 15mm 27.4mm 40.6mm - - - - -
RS Stock No. 163-3136
Mfr. Part No.7427015
TWD218
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. 644-1306
Mfr. Part No.HF70BB9.5X10.4X4.9
BrandTDK
TWD13
Each (In a Pack of 10)
units
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
TWD23
Each (In a Pack of 5)
units
Toroid Core 14.5 (Dia.) x 8mm Multi-Turn Suppression Core - K5B 14.5mm 8mm - 14.5mm - - - - -
RS Stock No. 124-1542
Mfr. Part No.74270031
TWD22
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. 167-0319
Mfr. Part No.B64290L0038X830
BrandEPCOS
TWD14,247
1 Box of 3000
Box(es)
Ferrite Core 10.8 (Dia.) x 4.75mm - - N30 10.8mm 4.75mm 5.05mm 10.8mm - - - - -
RS Stock No. 647-9907
Mfr. Part No.B64290L0038X830
BrandEPCOS
TWD7
Each (In a Pack of 10)
units
Ferrite Core 10.8 (Dia.) x 4.75mm - - N30 10.8mm 4.75mm 5.05mm 10.8mm - - - - -
RS Stock No. 172-9983
Mfr. Part No.2643665802
BrandFair-Rite
TWD38
Each (In a Box of 910)
units
Round Cable Core 17.45 x 9.5 x 12.7mm EMI Suppression - 43 Material 17.45mm 12.7mm 9.5mm 17.45mm - - - - -
RS Stock No. 811-9017
Mfr. Part No.ESD-R-19
BrandKEMET
TWD21
Each (In a Bag of 5)
units
Ferrite Core - Consumer Electronics - Ferrite - - - - 19 Dia. x 11mm - 11mm ESD-R Toroidal Cores 9mm
RS Stock No. 172-9985
Mfr. Part No.2631250202
BrandFair-Rite
TWD46
Each (In a Box of 50)
units
Round Cable Core 6.35 x 2.95 x 25.4mm Suppression Components - 31 Material 6.35mm 25.4mm 2.95mm 6.35mm - - - - -
RS Stock No. 467-3163
Mfr. Part No.2673000501
BrandFair-Rite
TWD6
Each (In a Pack of 50)
units
Bead 2 x 1.05 x 1.65mm Suppression Components - 73 Material 2mm 1.65mm 1.05mm 2mm - - - - -
RS Stock No. 172-9994
Mfr. Part No.2631626402
BrandFair-Rite
TWD95
Each (In a Box of 376)
units
Round Cable Core 18.7 x 10.15 x 28.6mm Suppression Components - 31 Material 18.7mm 28.6mm 10.15mm 18.7mm - - - - -