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. 358-6579
Mfr. Part No.742792514
$0.407
Each (In a Pack of 10)
units
1812 (4532M) - 600Ω - - - 3A - 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - General Electronics
RS Stock No. 239-589
Mfr. Part No.BL01RN1A1F1J
BrandMurata
$0.348
Each (In a Pack of 10)
units
Axial - - - - - 7A Bead 3.6 (Dia.) x 5mm 5mm - - 3.6mm General Electronics
RS Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
$0.076
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
RS Stock No. 144-9818
Mfr. Part No.742792514
$0.326
Each (On a Reel of 1000)
units
1812 - 600Ω - - - 3A - 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - General Electronics
RS Stock No. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
$0.118
Each (On a Reel of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
$0.03
Each (On a Reel of 10000)
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
RS Stock No. 124-1839
Mfr. Part No.742792040
$0.321
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. 683-5247
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
$1.687
Each (In a Pack of 10)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 110-655
Mfr. Part No.BLM18HK102SN1D
BrandMurata
$0.156
Each (In a Bag of 25)
units
0603 (1608M) - 1000Ω - - - 50mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 724-1605
Mfr. Part No.BL01RN1A1D2B
BrandMurata
$0.194
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 167-4982
Mfr. Part No.BLM18HE601SN1D
BrandMurata
$0.081
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - - 800mA 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
RS Stock No. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
$0.031
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
RS Stock No. 604-1906
Mfr. Part No.MMZ2012R600AT
BrandTDK
$0.135
Each (In a Pack of 10)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
RS Stock No. 144-9841
Mfr. Part No.742792695
$0.205
Each (On a Reel of 4000)
units
0603 - 2500Ω - - - 50mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 166-9616
Mfr. Part No.BL01RN1A2A2B
BrandMurata
$0.135
Each (In a Bag of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 467-3343
Mfr. Part No.2743005112
BrandFair-Rite
$0.15
Each (In a Pack of 50)
units
Axial 60Ω 91Ω - - - - Bead 3.5 (Dia.) x 6mm 6mm - - 3.5mm EMI Suppression
RS Stock No. 669-4024
Mfr. Part No.742792695
$0.263
Each (In a Pack of 10)
units
0603 (1608M) - 2500Ω - - - 50mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 724-1609
Mfr. Part No.BL01RN1A2A2B
BrandMurata
$0.226
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 792-6268
Mfr. Part No.BLM18HE601SN1D
BrandMurata
$0.182
Each (In a Bag of 25)
units
0603 (1608M) - 600Ω - - - 800mA 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
RS Stock No. 467-3371
Mfr. Part No.2743037447
BrandFair-Rite
$0.221
Each (In a Pack of 25)
units
SMD 56Ω 95Ω - - - - Bead 9.25 x 4.6 x 2.7mm 9.25mm 4.6mm 2.7mm - EMI Suppression
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