Ferrite Beads

Ferrite Beads also known as ferrite chokes are passive devices and they are used to constrict high-frequency signals in electronic components. The ferrite becomes resistive over its intended frequency range and uses up the noise energy in the form of heat.


How do the ferrite beads work?


The ferrite bead is connected in series with the power supply rail and is often combined with the capacitors to ground on either side of the bead. This then forms a low-pass filter network, further reducing the high-frequency power supply noise. Use SPICE (Simulation Program with Integrated Circuit Emphasis) or another similar tool to ensure any anti-resonance peaks caused by ferrite or PCB inductive structure does not violate the target impedance limit.


Ferrite Beads come in two categories:


High-Q Beads - typically used as resonators and must not be used in power isolation circuits


Low-Q Beads - these are also called absorptive beads and they are lossy and make good filter networks because they are designed to absorb high-frequency noise currents and dissipate it as heat


What to consider when choosing Ferrite Beads?


Make sure that any voltage drop does not cause the target supply rail to fall below the recommended operating conditions of the device


The ferrite bead is inductive, therefore do not use it with High-Q decoupling capacitors


Applying ferrite beads correctly can be an effective and inexpensive way to reduce high-frequency noise and switching transients


Where are Ferrite Beads used?


Eliminating high-frequency EMI noise on any circuit design


Electronic devices such as mobile phones


Computers and laptops


TV tuners


Audio Players


DVD’s


Gaming Systems


...
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Description Price Package Type Impedance at 25 MHz Impedance at 100 MHz Impedance at 300 MHz Impedance at 500 MHz Impedance at 1 GHz Current Rating Type Dimensions Length Depth Height Diameter Application
RS Stock No. 172-9955
Mfr. Part No.2743003112
BrandFair-Rite
£0.056
Each (On a Reel of 4500)
Units
Axial 65Ω 100Ω - - - - Bead 3.5 (Dia.) x 6.7mm 6.7mm - - 3.5mm EMI Suppression
RS Stock No. 467-3321
Mfr. Part No.2743003112
BrandFair-Rite
£0.077
Each (In a Pack of 50)
Units
Axial 65Ω 100Ω - - - - Bead 3.5 (Dia.) x 6.7mm 6.7mm - - 3.5mm EMI Suppression
RS Stock No. 467-3797
Mfr. Part No.2944666631
BrandFair-Rite
£0.262
Each (In a Pack of 10)
Units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 467-3781
Mfr. Part No.2944777741
BrandFair-Rite
£0.474
Each (In a Pack of 5)
Units
Axial - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm EMI Suppression
RS Stock No. 172-9975
Mfr. Part No.2944666631
BrandFair-Rite
£0.182
Each (In a Box of 200)
Units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 172-9984
Mfr. Part No.2944777741
BrandFair-Rite
£0.463
Each (In a Box of 79)
Units
Axial - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm EMI Suppression
RS Stock No. 172-9976
Mfr. Part No.2961666671
BrandFair-Rite
£0.23
Each (In a Box of 200)
Units
Axial - 780Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 172-9954
Mfr. Part No.2743002112
BrandFair-Rite
£0.056
Each (On a Reel of 4500)
Units
Axial 88Ω 133Ω - - - - Bead 3.5 (Dia.) x 8.9mm 8.9mm - - 3.5mm EMI Suppression
RS Stock No. 172-9960
Mfr. Part No.2743021447
BrandFair-Rite
£0.068
Each (On a Reel of 2800)
Units
SMD 56Ω 95Ω - - - - Bead 9.6 x 3.05 x 2.85mm 9.6mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 467-3365
Mfr. Part No.2743021447
BrandFair-Rite
£0.082
Each (In a Pack of 25)
Units
SMD 56Ω 95Ω - - - - Bead 9.6 x 3.05 x 2.85mm 9.6mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 467-3315
Mfr. Part No.2743002112
BrandFair-Rite
£0.086
Each (In a Pack of 50)
Units
Axial 88Ω 133Ω - - - - Bead 3.5 (Dia.) x 8.9mm 8.9mm - - 3.5mm EMI Suppression
RS Stock No. 467-3927
Mfr. Part No.2961666671
BrandFair-Rite
£0.282
Each (In a Pack of 10)
Units
Axial - 780Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 172-9951
Mfr. Part No.2743001112
BrandFair-Rite
£0.045
Each (On a Reel of 4500)
Units
Axial 61Ω - - - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression
RS Stock No. 467-3292
Mfr. Part No.2743001112
BrandFair-Rite
£0.06
Each (In a Pack of 50)
Units
Axial 61Ω - - - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression
RS Stock No. 172-9969
Mfr. Part No.2773008112
BrandFair-Rite
£0.135
Each (On a Reel of 4500)
Units
Axial 145Ω - - - - - Bead 3.5 (Dia.) x 11.4mm 11.4mm - - 3.5mm EMI Suppression
RS Stock No. 467-3488
Mfr. Part No.2773008112
BrandFair-Rite
£0.151
Each (In a Pack of 25)
Units
Axial 145Ω - - - - - Bead 3.5 (Dia.) x 11.4mm 11.4mm - - 3.5mm EMI Suppression
RS Stock No. 172-9972
Mfr. Part No.2944666651
BrandFair-Rite
£0.192
Each (In a Box of 200)
Units
Radial - 600Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 467-3810
Mfr. Part No.2944666651
BrandFair-Rite
£0.252
Each (In a Pack of 10)
Units
Radial - 600Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 467-3725
Mfr. Part No.2943666651
BrandFair-Rite
£0.374
Each (In a Pack of 10)
Units
Radial - - - - - - Multi Aperture Core - - - - - Broadband Transformers
RS Stock No. 172-9958
Mfr. Part No.2761001112
BrandFair-Rite
£0.056
Each (On a Reel of 4500)
Units
Axial - 52Ω - - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression