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. 124-1521
Mfr. Part No.74275043
R 6.372
Each (In a Pack of 20)
units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm General Electronics
RS stock no. 163-3222
Mfr. Part No.742792131
R 6,969.13
Each (On a Reel of 3000)
units
1206 (3216M) - 600Ω - - - 200mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS stock no. 839-0780
Mfr. Part No.BLM15GA750SN1D
BrandMurata
R 0.707
Each (In a Bag of 10)
units
0402 (1005M) - 75Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High-GHz Band High-speed signal lines
RS stock no. 787-9951
Mfr. Part No.742792095
R 3.477
Each (In a Bag of 10)
units
0805 (2012M) - 2700Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 467-3781
Mfr. Part No.2944777741
BrandFair-Rite
R 8.694
Each (In a Pack of 5)
units
Axial - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm EMI Suppression
RS stock no. 669-4083
Mfr. Part No.742792011
R 0.755
Each (In a Pack of 10)
units
0805 (2012M) - 10Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 888-3553
Mfr. Part No.HFA150068-0A2
R 39.952
Each (In a Pack of 10)
units
150068 - - 275Ω - - Snap-On EMI Core, Split EMI Core 21 x 41.7 x 21mm 21mm 41.7mm 21mm - EMI Suppression
RS stock no. 792-6299
Mfr. Part No.BLM18TG221TN1D
BrandMurata
R 0.779
Each (In a Bag of 25)
units
0603 (1608M) - 220Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, General Use
RS stock no. 358-6563
Mfr. Part No.74275022
R 19.33
Each
units
Axial - - - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS stock no. 786-5065
Mfr. Part No.MMZ2012Y102BT
BrandTDK
R 0.546
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
RS stock no. 167-4986
Mfr. Part No.BLM21PG220SH1D
BrandMurata
R 0.592
Each (On a Reel of 4000)
units
0805 (2012M) - 22Ω - - - 6A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 792-6312
Mfr. Part No.BLM21PG221SH1D
BrandMurata
R 1.429
Each (In a Bag 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. 172-9977
Mfr. Part No.2961666661
BrandFair-Rite
R 7.538
Each (In a Box of 200)
units
Axial - 380Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS stock no. 166-9557
Mfr. Part No.BLM15AG601SN1D
BrandMurata
R 0.295
Each (On a Reel of 10000)
units
0402 (1005M) - 600Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS stock no. 888-3519
Mfr. Part No.28F0121-1SR-10
R 4.119
Each (In a Pack of 100)
units
3812 (9630M) 60Ω 96Ω - - 114Ω 10A Bead 3.05 x 2.54 x 8.51mm 3.05mm 2.54mm 8.51mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS stock no. 124-1518
Mfr. Part No.7427504
R 5.065
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. 788-0134
Mfr. Part No.742862160
R 3.838
Each (In a Bag of 10)
units
0603 (1608M) - 660Ω - - - 100mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Highspeed Bus Systems, Suppression Components
RS stock no. 467-3725
Mfr. Part No.2943666651
BrandFair-Rite
R 10.18
Each (In a Pack of 10)
units
Radial - - - - - - Multi Aperture Core - - - - - Broadband Transformers
RS stock no. 163-3212
Mfr. Part No.742730023
R 41.456
Each (In a Tube of 40)
units
Radial - 338Ω - - - - Multi Line 11 x 11.2 x 11.2mm 11.2mm 11.2mm 11mm - EMI Suppression, General Electronics
RS stock no. 724-1299
Mfr. Part No.BLM18AG601SN1D
BrandMurata
R 0.98
Each (In a Pack of 25)
units
0603 (1608M) - 600Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, General Use