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. 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. 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. 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. 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. 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. 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
RS Stock No. 327-5566
Mfr. Part No.74279218
MYR1.057
Each (In a Pack of 10)
units
1206 (3216M) - 600Ω - - - 2A - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 124-1873
Mfr. Part No.742792410
MYR0.98
Each (In a Pack of 50)
units
1806 (4516M) - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 124-1869
Mfr. Part No.74279218
MYR0.878
Each (In a Pack of 50)
units
1206 (3216M) - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 144-9805
Mfr. Part No.74279218
MYR0.65
Each (On a Reel of 3000)
units
1206 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 144-9808
Mfr. Part No.742792410
MYR0.74
Each (On a Reel of 2000)
units
1806 - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 163-3532
Mfr. Part No.742792011
MYR0.673
Each (On a Reel of 4000)
units
0805 (2012M) - 10Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 163-3996
Mfr. Part No.74279224101
MYR3.58
Each (On a Reel of 2000)
units
2220 (5650M) - 100Ω - - - 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
RS Stock No. 788-0092
Mfr. Part No.7427927311
MYR0.703
Each (In a Bag of 10)
units
0402 (1005M) - 120Ω - - - 1.2mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 124-1834
Mfr. Part No.742792641
MYR0.687
Each (In a Pack of 50)
units
0603 (1608M) - 300Ω - - - 2A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 124-1870
Mfr. Part No.74279215
MYR0.896
Each (In a Pack of 50)
units
1206 (3216M) - 80Ω - - - 3A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Anti EMI, Control Signals, DC/DC Converter, Fast Bus Signals, HDD, High Current, High Frequency, High Speed, Line Filter, LVDS, Power Supply, RS232, RS422, USB 2.0
RS Stock No. 358-6563
Mfr. Part No.74275022
MYR5.95
Each
units
Axial - - - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 749-8299
Mfr. Part No.74279224101
MYR4.46
Each (In a Bag of 5)
units
2220 (5650M) - 100Ω - - - 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
RS Stock No. 144-9874
Mfr. Part No.7427927311
MYR0.537
Each (On a Reel of 10000)
units
0402 - 120Ω - - - 1.2mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components