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 500 MHz Impedance at 1 GHz Current Rating Type Dimensions Length Depth Height Diameter Application Material
RS Stock No. 163-3220
Mfr. Part No.742792036
$0.239
Each (On a Reel of 4000)
units
0805 (2012M) - 70Ω - - 200mA - 2 x 1.2 x 0.9mm 2mm 1.24mm 0.9mm - General Electronics -
RS Stock No. 124-1518
Mfr. Part No.7427504
$0.792
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 Ferrite
RS Stock No. 871-2067
Mfr. Part No.BLM15BB100SN1D
BrandMurata
$0.061
Each (In a Bag of 250)
units
0402 (1005M) - 10Ω - - 300mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - High Speed Signal Lines Ferrite
RS Stock No. 787-9951
Mfr. Part No.742792095
$0.35
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 Ferrite
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. 172-9958
Mfr. Part No.2761001112
BrandFair-Rite
$0.204
Each (On a Reel of 4500)
units
Axial - 52Ω - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression -
RS Stock No. 863-7161
Mfr. Part No.3-1624116-8
$0.201
Each (In a Bag of 100)
units
0603 (1608M) - 1200Ω - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - General Purpose, High frequency Ferrite
RS Stock No. 792-6249
Mfr. Part No.BLM18EG121SN1D
BrandMurata
$0.217
Each (In a Bag of 25)
units
0603 (1608M) - 120Ω - - 2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type) Ferrite
RS Stock No. 164-5843
Mfr. Part No.4-1624117-7
$0.15
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - - Ferrite
RS Stock No. 161-8058
Mfr. Part No.BLM18BB600SN1D
BrandMurata
$0.037
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - 600mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines Ferrite
RS Stock No. 788-0134
Mfr. Part No.742862160
$0.381
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 Ferrite
RS Stock No. 812-0777
Mfr. Part No.BMB2A0120AN4
$0.091
Each (In a Bag of 100)
units
0805 (2012M) - 120Ω - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - EMI Filtering, General Electronics Ferrite
RS Stock No. 163-4591
Mfr. Part No.742862160
$0.282
Each (On a Reel of 4000)
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 Ferrite
RS Stock No. 863-7354
Mfr. Part No.6-1624117-3
$0.198
Each (In a Bag of 100)
units
0805 (2012M) - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Current, Noise Filtering Ferrite
RS Stock No. 104-8533
Mfr. Part No.BLM18PG330SH1D
BrandMurata
$0.07
Each (In a Pack of 200)
units
0603 (1608M) - 33Ω - - 3A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety Ferrite
RS Stock No. 467-3810
Mfr. Part No.2944666651
BrandFair-Rite
$0.51
Each (In a Pack of 10)
units
Radial - 600Ω - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression -
RS Stock No. 164-5314
Mfr. Part No.BMB2A0470LN2
$0.187
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom Ferrite
RS Stock No. 163-3537
Mfr. Part No.74279208
$0.233
Each (On a Reel of 4000)
units
0805 (2012M) - 40Ω - - 500mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components Ferrite
RS Stock No. 724-1390
Mfr. Part No.BLM18PG221SN1D
BrandMurata
$0.084
Each (In a Pack of 25)
units
0603 (1608M) - 220Ω - - 1.4A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies Ferrite
RS Stock No. 181-4422
Mfr. Part No.MH1608-601Y
BrandBourns
$0.035
Each (On a Reel of 4000)
units
1608 - 600Ω - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - IC Power Lines, Power Supply Lines, Signal Lines Ferrite
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