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


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. 124-1520
Mfr. Part No.74275013
€0.287
Each (In a Pack of 20)
units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 749-8328
Mfr. Part No.74279226101
€0.98
Each (In a Bag of 5)
units
1812 (4532M) - 100Ω - - - 8A Bead 4.5 x 3.2 x 2.3mm 4.5mm 3.2mm 2.3mm - EMI Suppression, High Current
RS Stock No. 124-1521
Mfr. Part No.74275043
€0.357
Each (In a Pack of 20)
units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Protection Against Radio Frequency Interferences of Components on PCB's of PC's, Text Processing and Other Digital Devices
RS Stock No. 163-3528
Mfr. Part No.7427511
€0.897
Each (On a Reel of 1000)
units
SMD 272Ω 416Ω - - - 5A Bead 8 x 5 x 4.6mm 8mm 5mm 4.6mm - EMI Suppression, RFI Suppression
RS Stock No. 358-6759
Mfr. Part No.742792151
€0.191
Each (In a Pack of 10)
units
1206 (3216M) - - - - - 300mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 163-4003
Mfr. Part No.74279226101
€0.504
Each (On a Reel of 2500)
units
1812 (4532M) - 100Ω - - - 8A Bead 4.5 x 3.2 x 2.3mm 4.5mm 3.2mm 2.3mm - EMI Suppression, High Current
RS Stock No. 124-1839
Mfr. Part No.742792040
€0.187
Each (In a Pack of 50)
units
0805 (2012M) - 600Ω - - - 2A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - 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. 163-3223
Mfr. Part No.742792151
€0.129
Each (On a Reel of 3000)
units
1206 (3216M) - 70Ω - - - 300mA Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 863-0895
Mfr. Part No.74279228600
€0.262
Each (In a Bag of 10)
units
0603 (1608M) - 60Ω - - - 5.1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - DC/DC Converter, High Current, Power Supply
RS Stock No. 163-7388
Mfr. Part No.74279228600
€0.192
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 5.1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - DC/DC Converter, High Current, Power Supply
RS Stock No. 163-3551
Mfr. Part No.74279242
€0.189
Each (On a Reel of 2000)
units
1806 (4516M) - 150Ω - 280Ω - 200mA EMI Suppression 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Suppression Components
RS Stock No. 144-9856
Mfr. Part No.7427512
€0.919
Each (On a Reel of 1000)
units
- 425Ω 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 736-2125
Mfr. Part No.7427512
€1.163
Each (In a Bag of 10)
units
SMD 425Ω 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 144-9788
Mfr. Part No.742792040
€0.114
Each (On a Reel of 4000)
units
0805 - 600Ω - - - 2A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - 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. 669-4162
Mfr. Part No.74279242
€0.225
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. 736-2116
Mfr. Part No.7427511
€1.163
Each (In a Bag of 10)
units
SMD 272Ω 416Ω - - - 5A Bead 8 x 5 x 4.6mm 8mm 5mm 4.6mm - EMI Suppression, RFI Suppression
RS Stock No. 669-3986
Mfr. Part No.742792608
€0.271
Each (In a Pack of 10)
units
0603 (1608M) - 47Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 124-1518
Mfr. Part No.7427504
€0.287
Each (In a Pack of 20)
units
Axial 702Ω 773Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 163-3541
Mfr. Part No.74279212
€0.136
Each (On a Reel of 3000)
units
1206 (3216M) - 150Ω - - - 300mA EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 669-4086
Mfr. Part No.742792021
€0.193
Each (In a Pack of 10)
units
0805 (2012M) - 22Ω - - - 6A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components