Ferrite Beads

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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

DVDs

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. 888-3478
Mfr. Part No.28B0735-000
MYR2.33
Each (In a Pack of 50)
units
0735 135Ω 250Ω 400Ω - - - Cylindrical EMI Core 18.67 x 28.58mm 28.58mm - - 18.67mm EMI Suppression
RS Stock No. 124-1519
Mfr. Part No.7427501
MYR1.593
Each (In a Pack of 20)
units
Axial 598Ω 800Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
MYR0.251
Each (In a Pack of 25)
units
0805 (2012M) - 220Ω - - - 2A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 124-1518
Mfr. Part No.7427504
MYR3.317
Each (In a Pack of 20)
units
Axial 702Ω 773Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 888-3358
Mfr. Part No.28A2024-0A2
MYR7.581
Each (In a Pack of 10)
units
2024 130Ω 280Ω 440Ω - - - EMI Cable Core 29 x 32.5 x 29.62mm 29mm 32.5mm 29.62mm - EMI Suppression
RS Stock No. 604-2088
Mfr. Part No.MPZ1608D101BT
BrandTDK
MYR0.317
Each (In a Pack of 10)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Power Line
RS Stock No. 144-9814
Mfr. Part No.74279204
MYR0.629
Each (On a Reel of 4000)
units
0805 - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS Stock No. 260-6874
Mfr. Part No.74279204
MYR0.802
Each (In a Pack of 10)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS Stock No. 888-3342
Mfr. Part No.28A0807-0A2
MYR5.166
Each (In a Pack of 50)
units
0807 160Ω 348Ω 514Ω - - - Snap-On EMI Core, Split EMI Core 24.82 x 55.91mm 55.91mm - - 24.82mm EMI Suppression
RS Stock No. 163-3551
Mfr. Part No.74279242
MYR0.699
Each (On a Reel of 2000)
units
1806 (4516M) - 150Ω - - - 200mA EMI Suppression 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Suppression Components
RS Stock No. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
MYR0.084
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
RS Stock No. 669-4162
Mfr. Part No.74279242
MYR1.03
Each (In a Pack of 10)
units
1806 (4516M) - 150Ω - - - 200mA EMI Suppression 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Suppression Components
RS Stock No. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
MYR0.082
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - - 550mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 888-3437
Mfr. Part No.28B0375-100
MYR0.464
Each (In a Pack of 500)
units
0375 74Ω 154Ω 282Ω - - - Cylindrical EMI Core 9.53 x 14.48mm 14.48mm - - 9.53mm EMI Suppression
RS Stock No. 724-1429
Mfr. Part No.BLM18PG600SN1D
BrandMurata
MYR0.226
Each (In a Pack of 25)
units
0603 (1608M) - 60Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
MYR0.201
Each (In a Pack of 25)
units
0402 (1005M) - 120Ω - - - 550mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 724-1523
Mfr. Part No.BLM21BD222TN1D
BrandMurata
MYR0.458
Each (In a Pack of 25)
units
0805 (2012M) - 2200Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 888-3474
Mfr. Part No.28B0686-200
MYR1.813
Each (In a Pack of 50)
units
0686 124Ω 242Ω 390Ω - - - Cylindrical EMI Core 17.42 x 28.58mm 28.58mm - - 17.42mm EMI Suppression
RS Stock No. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
MYR0.714
Each (In a Pack of 25)
units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 124-1520
Mfr. Part No.74275013
MYR3.964
Each (In a Pack of 20)
units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
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