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 500 MHz Impedance at 1 GHz Current Rating Type Dimensions Length Depth Height Diameter Application Material
RS Stock No. 724-1334
Mfr. Part No.BLM18GG471SN1D
BrandMurata
$0.257
Each (In a Pack of 25)
units
0603 (1608M) - 470Ω - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High-GHz Band General Use Ferrite
RS Stock No. 467-3444
Mfr. Part No.2761001112
BrandFair-Rite
$0.188
Each (In a Pack of 25)
units
Axial - 52Ω - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression -
RS Stock No. 669-4169
Mfr. Part No.74279244
$0.44
Each (In a Pack of 10)
units
1806 (4516M) - 850Ω - - 1.5A EMI Suppression 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Suppression Components Ferrite
RS Stock No. 163-4572
Mfr. Part No.7427927112
$0.166
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - 350mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components Ferrite
RS Stock No. 187-3463
Mfr. Part No.BLM03HG601SN1D
BrandMurata
$0.149
Each (On a Reel of 15000)
units
0603M - 600Ω - 1000Ω 150mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - - Ferrite
RS Stock No. 741-3175
Mfr. Part No.MPZ1005S300CT
BrandTDK
$0.091
Each (In a Bag of 100)
units
0402 (1005M) - - - - - - 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - - -
RS Stock No. 122-5326
Mfr. Part No.BLM21AG102SH1D
BrandMurata
$0.079
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Automotive, Powertrain, Safety Ferrite
RS Stock No. 164-5798
Mfr. Part No.3-1624116-7
$0.117
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - - Ferrite
RS Stock No. 167-4203
Mfr. Part No.BLM18HE102SN1D
BrandMurata
$0.086
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - 600mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band High-Speed Signal Line Ferrite
RS Stock No. 863-7275
Mfr. Part No.5-1624117-2
$0.182
Each (In a Bag of 100)
units
0805 (2012M) - 200Ω - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - General Purpose, High frequency Ferrite
RS Stock No. 604-1861
Mfr. Part No.MMZ2012R121AT
BrandTDK
$0.154
Each (In a Pack of 10)
units
0805 - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line Ferrite
RS Stock No. 163-7379
Mfr. Part No.74279220321
$0.334
Each (On a Reel of 4000)
units
0805 (2012M) - 320Ω - - 2.5A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 0.9mm 1.2mm - DC/DC Converter, High Current, Power Supply -
RS Stock No. 643-9921
Mfr. Part No.MPZ1005S121CT
BrandTDK
$0.149
Each (In a Pack of 10)
units
0402 - - - - - Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Power Line -
RS Stock No. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
$0.033
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - 450mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, General Electronics Ferrite
RS Stock No. 125-3152
Mfr. Part No.BLM21AG102SN1D
BrandMurata
$0.063
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, General Electronics Ferrite
RS Stock No. 163-7386
Mfr. Part No.74279228111
$0.399
Each (On a Reel of 4000)
units
0603 (1608M) - 110Ω - - 4.1A 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. 604-2088
Mfr. Part No.MPZ1608D101BT
BrandTDK
$0.133
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. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
$0.084
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 Ferrite
RS Stock No. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
$0.106
Each (In a Pack of 25)
units
0805 (2012M) - 330Ω - - 1.5A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies Ferrite
RS Stock No. 741-3129
Mfr. Part No.MMZ1608R102AT
BrandTDK
$0.077
Each (In a Bag of 100)
units
0603 (1608M) - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line R
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