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. 747-4720
Mfr. Part No.BLM18KG601SN1D
BrandMurata
SGD0.053
Each (In a Bag of 100)
units
0603 (1608M) - 600Ω - - - 1.3A 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. 144-9814
Mfr. Part No.74279204
SGD0.232
Each (On a Reel of 4000)
units
0805 - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS Stock No. 888-3358
Mfr. Part No.28A2024-0A2
SGD4.30
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. 146-0716
Mfr. Part No.7427927218
SGD0.253
Each (In a Pack of 50)
units
0402 (1005M) - 180Ω - 260Ω - 400mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Data Line Filter, Uncoupling of Distribution Voltage
RS Stock No. 888-3074
Mfr. Part No.HI2220Q401R-10
SGD0.728
Each (In a Pack of 50)
units
2220 (5650M) 100Ω 400Ω - - 99Ω 4.5A Chip Bead 5.59 x 5.08 x 3.2mm 5.59mm 5.08mm 3.2mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 888-3030
Mfr. Part No.HI1206T161R-10
SGD0.126
Each (In a Pack of 500)
units
1206 (3216M) 71Ω 160Ω - - 127Ω 6A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 604-2224
Mfr. Part No.MPZ2012S300AT
BrandTDK
SGD0.149
Each (In a Pack of 10)
units
0805 - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Power Line
RS Stock No. 839-0796
Mfr. Part No.BLM15PD300SN1D
BrandMurata
SGD0.025
Each (In a Bag of 100)
units
0402 (1005M) - 30Ω - - - 2.2A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS Stock No. 812-0764
Mfr. Part No.BMB2A0060LN2
SGD0.134
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 888-3077
Mfr. Part No.HI2220P601R-10
SGD0.796
Each (In a Pack of 50)
units
2220 (5650M) 220Ω 600Ω - - 106Ω 4A Chip Bead 5.59 x 5.08 x 3.05mm 5.59mm 5.08mm 3.05mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
SGD0.08
Each (In a Pack of 25)
units
0402 (1005M) - 220Ω - - - 450mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 888-3345
Mfr. Part No.28A1507-0A2
SGD0.741
Each (In a Pack of 50)
units
1507 56Ω 123Ω 246Ω - - - Snap-On EMI Core, Split EMI Core 150 x 180mm 180mm - - 150mm EMI Suppression
RS Stock No. 104-8524
Mfr. Part No.BLM15PX121SN1D
BrandMurata
SGD0.079
Each (In a Pack of 200)
units
0402 (1005M) - 120Ω - - - 2A Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - General Use
RS Stock No. 163-7388
Mfr. Part No.74279228600
SGD0.759
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 5.1A 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. 749-8325
Mfr. Part No.74279225101
SGD1.892
Each (In a Bag of 5)
units
3312 - 100Ω - - - 10A Bead 8.5 x 3.05 x 2.28mm 8.5mm 3.05mm 2.28mm - EMI Suppression, High Current
RS Stock No. 166-9870
Mfr. Part No.BLM21PG600SN1D
BrandMurata
SGD0.042
Each (On a Reel of 4000)
units
0805 (2012M) - 60Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 122-5313
Mfr. Part No.BLM15PX121SN1D
BrandMurata
SGD0.049
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - - 2A Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - General Electronics
RS Stock No. 144-9785
Mfr. Part No.742792651
SGD0.198
Each (On a Reel of 4000)
units
603 - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 724-1542
Mfr. Part No.BLM21PG600SN1D
BrandMurata
SGD0.088
Each (In a Pack of 25)
units
0805 (2012M) - 60Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
SGD0.101
Each (In a Pack of 20)
units
0603 (1608M) - 1000Ω - - - 450mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, General Use
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