Ferrite Sleeves

Ferrite sleeves, also known as ferrite beads, are non-conductive components used in electrical circuits to suppress or filter high frequency electromagnetic interference noise. They prevent electromagnetic interference to and from a device. 


How do ferrite sleeves work?

If a device produces radio frequency energy, the conductive cable is used as an antenna to transmit the energy through the device. The ferrite sleeve or bead reduces the output of EMI from the device itself and prevents the cable from acting as an antenna for other sources of EMI, like household appliances. 


Uses for ferrite sleeves


Ferrite sleeves are commonly found on data cables and medical equipment. They may be built in to the equipment or be separate items that can be clamped on to a cable. You may see larger ones on external cables, like on computer monitor cables, while smaller ones can be used internally in electrical circuits, on printed circiut boards (PCBs) for example. Ferrite sleeves are often needed for regulatory compliance. 


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Description Price Series Type Application Material Impedance at 25 MHz Key Openable Impedance at 100 MHz Outer Dimensions Aperture Diameter Impedance at 500 MHz Number of Apertures Outer Depth Outer Height
RS Stock No. 169-6793
Mfr. Part No.ESD-SR-250
BrandKEMET
£3.87
Each (In a Box of 60)
Units
ESD-SR Snap-on Cores Snap Ferrite Consumer Electronics Ferrite - - Yes - 31.5 x 38 x 31.6mm 13mm - 1 38mm 31.6mm
RS Stock No. 257-4389
Mfr. Part No.RT130-070-070-K5B
BrandRichco
£1.002
Each (In a Pack of 5)
Units
RT Toroid Core Multi-Turn Suppression Core Ferrite - - - - 13 Dia. x 7mm 7mm - 1 - 7mm
RS Stock No. 815-0027
Mfr. Part No.74271733S
£4.93
Each
Units
STAR-FIX Snap Ferrite General Application, Safety Relevant Application 4W620 - No Yes 246Ω 35.1 x 21.7 x 18.2mm 8mm - 1 21.7mm 18.2mm
RS Stock No. 169-6794
Mfr. Part No.ESD-SR-160
BrandKEMET
£1.43
Each (In a Box of 400)
Units
ESD-SR Snap-on Cores Snap Ferrite Consumer Electronics Ferrite - - Yes - 20.2 x 39 x 20mm 9mm - 1 39mm 20mm
RS Stock No. 815-0024
Mfr. Part No.74271722S
£6.13
Each
Units
STAR-FIX Snap Ferrite General Application, Safety Relevant Application 4W620 - No Yes 270Ω 35.1 x 31 x 28mm 12.5mm - 1 31mm 28mm
RS Stock No. 163-5436
Mfr. Part No.7427155S
£4.351
Each (In a Box of 30)
Units
STAR-RING Snap Ferrite General Application, Safety Relevant Application 4W620 - No Yes 100 55 x 20 x 44mm 27.5mm - 1 20mm 44mm
RS Stock No. 814-3382
Mfr. Part No.432703021311
BrandFERROXCUBE
£2.52
Each
Units
- Cable Shield EMI Suppression 4S2 Material - - - - 25.9 Dia. x 28.6mm 12.8mm - 1 - 28.6mm
RS Stock No. 811-9124
Mfr. Part No.ESD-SR-160
BrandKEMET
£2.57
Each
Units
ESD-SR Snap-on Cores Snap Ferrite Consumer Electronics Ferrite - - Yes - 20.2 x 39 x 20mm 9mm - 1 39mm 20mm
RS Stock No. 162-1272
Mfr. Part No.74271722S
£5.047
Each (In a Box of 20)
Units
STAR-FIX Snap Ferrite General Application, Safety Relevant Application 4W620 - No Yes 270Ω 35.1 x 31 x 28mm 12.5mm - 1 31mm 28mm
RS Stock No. 171-0801
Mfr. Part No.432703021311
BrandFERROXCUBE
£1.949
Each (On a Reel of 128)
Units
- Cable Shield EMI Suppression 4S2 Material - - - - - - - - - -
RS Stock No. 169-6783
Mfr. Part No.ESD-R-38B
BrandKEMET
£1.99
Each (In a Box of 240)
Units
ESD-R Toroidal Cores Toroid Core Round Cable Manganese-Zinc (Coating), Nickel Zinc - - - - 42.4 Dia. x 16mm 17.9mm - 1 - 16mm
RS Stock No. 814-9964
Mfr. Part No.7427713
£1.48
Each
Units
STAR-CLIP Snap Ferrite General Application, Safety Relevant Application Ferrite - - - - 26 x 16 x 20mm - - - 16mm 20mm
RS Stock No. 811-9076
Mfr. Part No.ESD-R-38B
BrandKEMET
£3.31
Each
Units
ESD-R Toroidal Cores Toroid Core Round Cable Manganese-Zinc (Coating), Nickel Zinc - - - - 42.4 Dia. x 16mm 17.9mm - 1 - 16mm
RS Stock No. 169-6791
Mfr. Part No.ESD-SR-150
BrandKEMET
£1.43
Each (In a Box of 400)
Units
ESD-SR Snap-on Cores Snap Ferrite Consumer Electronics Ferrite - - Yes - 19.6 x 37.4 x 20.3mm 7mm - 1 37.4mm 20.3mm
RS Stock No. 811-9115
Mfr. Part No.ESD-SR-150
BrandKEMET
£2.75
Each
Units
ESD-SR Snap-on Cores Snap Ferrite Consumer Electronics Ferrite - - Yes - 19.6 x 37.4 x 20.3mm 7mm - 1 37.4mm 20.3mm
RS Stock No. 814-3442
Mfr. Part No.432703021091
BrandFERROXCUBE
£1.70
Each
Units
CSA Cable Shield EMI Suppression 4S2 Material - - Yes - 17.9 x 32.3 x 9.2mm 7mm - 1 17.9mm 9.2mm
RS Stock No. 185-7115
Mfr. Part No.74272251
£12.711
Each (In a Tray of 12)
Units
STAR-TEC Snap Ferrite Especially for Applications in the Low Frequency Range from 300 kHz to 30 Mhz, Perfect for Applications with Varying Cable Diameter, Reusable because of the Key Technology Therefore Perfect for Test and Measuring Purposes and Cables with Difficult Access, Suppression of Electronic Ballasts (i.e. Neon Tube) in the Lighting Industry Manganese-Zinc (Coating) - Yes - - 62 x 60 x 55mm 22 → 25mm - 1 62mm 55mm
RS Stock No. 185-7492
Mfr. Part No.74272151
£6.56
Each
Units
STAR-TEC Snap Ferrite Especially for Applications in the Low Frequency Range from 300 kHz to 30 Mhz, Perfect for Applications with Varying Cable Diameter, Reusable because of the Key Technology Therefore Perfect for Test and Measuring Purposes and Cables with Difficult Access, Suppression of Electronic Ballasts (i.e. Neon Tube) in the Lighting Industry Manganese-Zinc (Coating) - Yes - - 49 x 39 x 35mm 12 → 15mm - 1 49mm 35mm
RS Stock No. 151-2796
Mfr. Part No.475181651
BrandFair-Rite
£5.09
Each
Units
04 Round Cable Snap-Its EMI Suppression 75 Material - - Yes - 23 x 13 x 12.1mm 5.1mm - 1 13mm 12.1mm
RS Stock No. 168-3183
Mfr. Part No.74271151
£7.958
Each (In a Box of 24)
Units
STAR-TEC Snap Ferrite - Nickel Zinc - Yes Yes - 49 x 39 x 35 35mm - 1 39mm 35mm