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. 888-3358
Mfr. Part No.28A2024-0A2
€2.291
Each (In a Pack of 10)
units
2024 130Ω 280Ω 440Ω - - - EMI Cable Core 29 x 32.5 x 29.62mm 29mm 32.5mm 29.62mm - EMI Suppression
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
€0.059
Each (In a Pack 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. 888-3327
Mfr. Part No.28A0434-0A2
€0.645
Each (In a Pack of 50)
units
0434 111Ω 277Ω 449Ω - - - Snap-On EMI Core, Split EMI Core 14.71 x 433mm 433mm - - 14.71mm EMI Suppression
RS Stock No. 888-3355
Mfr. Part No.28A2025-0A2
€0.707
Each (In a Pack of 50)
units
2025 130Ω 320Ω 510Ω - - - Snap-On EMI Core, Split EMI Core 18.15 x 32.5 x 18.9mm 18.15mm 32.5mm 18.9mm - EMI Suppression
RS Stock No. 124-8154
Mfr. Part No.BLM18EG601SH1D
BrandMurata
€0.07
Each (In a Pack of 100)
units
0603 (1608M) - 600Ω - - 700Ω 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS Stock No. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
€0.044
Each (In a Pack 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, Power Supplies
RS Stock No. 747-4710
Mfr. Part No.BLM18KG121TN1D
BrandMurata
€0.029
Each (In a Bag of 100)
units
0603 (1608M) - 120Ω - - - 3A Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 124-1520
Mfr. Part No.74275013
€0.287
Each (In a Pack of 20)
units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 169-2760
Mfr. Part No.BLM18EG601SH1D
BrandMurata
€0.063
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - 700Ω 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS Stock No. 683-5247
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
€0.921
Each (In a Pack of 10)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
€0.009
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. 170-4654
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
€0.395
Each (On a Reel of 1000)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
€0.03
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. 358-6759
Mfr. Part No.742792151
€0.191
Each (In a Pack of 10)
units
1206 (3216M) - - - - - 300mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 724-1289
Mfr. Part No.BLM15HG601SN1D
BrandMurata
€0.037
Each (In a Pack of 25)
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 General Use
RS Stock No. 888-3569
Mfr. Part No.HFA259131-0A2
€6.99
Each
units
259131 - - 250Ω - - Snap-On EMI Core, Split EMI Core 29 x 32.5 x 29.62mm 29mm 32.5mm 29.62mm - EMI Suppression
RS Stock No. 792-6280
Mfr. Part No.BLM18SG260TN1D
BrandMurata
€0.084
Each (In a Bag of 25)
units
0603 (1608M) - 26Ω - - - 6A Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - Heavy Maintenace, Metal Surfaces
RS Stock No. 167-4945
Mfr. Part No.BLM18BA470SN1D
BrandMurata
€0.013
Each (On a Reel of 4000)
units
0603 (1608M) - 47Ω - - - 300mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 144-9788
Mfr. Part No.742792040
€0.114
Each (On a Reel of 4000)
units
805 - 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. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
€0.038
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
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