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. 669-4055
Mfr. Part No.7427920
$0.34
Each (In a Pack of 10)
units
0805 (2012M) - 11Ω - - - 600mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 122-5334
Mfr. Part No.BLM31PG121SH1L
BrandMurata
$0.163
Each (On a Reel of 3000)
units
1206 (3216M) - 120Ω - - - 3.5A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Automotive, Powertrain, Safety
RS Stock No. 749-8316
Mfr. Part No.74279224551
$2.176
Each (In a Bag of 5)
units
2220 (5650M) - 550Ω - - - 4A Bead 5.59 x 5.08 x 1.97mm 5.59mm 5.08mm 1.97mm - EMI Suppression, High Current
RS Stock No. 724-1337
Mfr. Part No.BLM18EG601SN1D
BrandMurata
$0.226
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, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 811-9604
Mfr. Part No.BLM18EG391TN1D
BrandMurata
$0.212
Each (In a Bag of 25)
units
0603 (1608M) - 390Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 863-7114
Mfr. Part No.1879855-9
$0.141
Each (In a Bag of 100)
units
0402 (1005M) - 1000Ω - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - General Purpose, High frequency
RS Stock No. 167-3813
Mfr. Part No.BLM15HD601SN1D
BrandMurata
$0.084
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, GHz Band High-speed Signal Lines
RS Stock No. 724-1526
Mfr. Part No.BLM21BD272SN1L
BrandMurata
$0.19
Each (In a Pack of 25)
units
0805 (2012M) - 2700Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 163-4583
Mfr. Part No.7427927280
$0.265
Each (On a Reel of 10000)
units
0402 (1005M) - 80Ω - - - 200mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 172-9975
Mfr. Part No.2944666631
BrandFair-Rite
$0.687
Each (In a Box of 200)
units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 812-0799
Mfr. Part No.BMB2A0470LN2
$0.382
Each (In a Bag of 10)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 164-5633
Mfr. Part No.1-1879855-4
$0.124
Each (On a Reel of 10000)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - -
RS Stock No. 163-4573
Mfr. Part No.7427927115
$0.228
Each (On a Reel of 10000)
units
0402 (1005M) - 150Ω - - - 100mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 169-6263
Mfr. Part No.BLM21PG331SN1J
BrandMurata
$0.073
Each (On a Reel of 10000)
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
RS Stock No. 166-9762
Mfr. Part No.BLM18AG221SN1D
BrandMurata
$0.034
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - - 700mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, General Use
RS Stock No. 167-4832
Mfr. Part No.BLM15AX601SN1D
BrandMurata
$0.038
Each (On a Reel of 10000)
units
0402 (1005M) - 600Ω - - - 500mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 164-5637
Mfr. Part No.1-1879855-8
$0.124
Each (On a Reel of 10000)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
$0.315
Each (In a Pack of 25)
units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 863-7307
Mfr. Part No.1-1879855-7
$0.09
Each (In a Bag of 100)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 788-0061
Mfr. Part No.7427927161
$0.292
Each (In a Bag of 10)
units
0402 (1005M) - 600Ω - - - 250mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
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