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. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
R 1.157
Each (On a Reel of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 124-1865
Mfr. Part No.74279206
R 3.234
Each (In a Pack of 50)
units
0805 (2012M) - 30Ω - - 55Ω 3A 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. 888-3096
Mfr. Part No.HR2220P601R-10
R 11.947
Each (In a Pack of 50)
units
2220 (5650M) 200Ω 600Ω - - 75Ω 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. 124-1520
Mfr. Part No.74275013
R 5.039
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. 669-4099
Mfr. Part No.742792022
R 3.256
Each (In a Pack of 10)
units
0805 (2012M) - 220Ω - - - 2A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 166-9709
Mfr. Part No.BLM21BD222SN1L
BrandMurata
R 2,307.35
Each (On a Reel of 3000)
units
0805 (2012M) - - - - - - 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. 144-9846
Mfr. Part No.742792022
R 1.93
Each (On a Reel of 4000)
units
0805 - 220Ω - - - 2A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 202-3667
Mfr. Part No.BLM21BD222SN1L
BrandMurata
R 1.218
Each (In a Pack of 20)
units
0805 (2012M) - - - - - - 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. 888-3490
Mfr. Part No.28B2000-100
R 123.22
Each
units
2000 157Ω 305Ω 442Ω - - - Cylindrical EMI Core 50.8 x 28.7mm 28.7mm - - 50.8mm EMI Suppression
RS stock no. 724-1277
Mfr. Part No.BLM15HD102SN1D
BrandMurata
R 1.052
Each (In a Pack of 25)
units
0402 (1005M) - 1000Ω - - - 250mA 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. 786-5037
Mfr. Part No.MMZ1608Y152BT
BrandTDK
R 0.385
Each (In a Bag of 100)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line
RS stock no. 109-4153
Mfr. Part No.MMZ1608Y152BT
BrandTDK
R 1,068.20
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line
RS stock no. 669-4070
Mfr. Part No.742792091
R 3.256
Each (In a Pack of 10)
units
0805 (2012M) - 1500Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 747-4726
Mfr. Part No.BLM18KG471SN1D
BrandMurata
R 0.347
Each (In a Bag of 100)
units
0603 (1608M) - 470Ω - - - 1.5A 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. 788-0131
Mfr. Part No.742863147
R 3.838
Each (In a Bag of 10)
units
0603 (1608M) - 470Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Highspeed Bus Systems, Suppression Components
RS stock no. 144-9864
Mfr. Part No.7427920415
R 1.84
Each (On a Reel of 4000)
units
0805 - 600Ω - - - 500mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 888-3355
Mfr. Part No.28A2025-0A2
R 12.485
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. 888-3484
Mfr. Part No.28B1225-000
R 13.006
Each (In a Pack of 50)
units
1225 68Ω 140Ω 270Ω - - - Cylindrical EMI Core 31.12 x 15.93mm 15.93mm - - 31.12mm EMI Suppression
RS stock no. 736-2100
Mfr. Part No.7427930
R 10.619
Each (In a Bag of 10)
units
SMD - 42Ω - - - 6A High Current 4 x 3 x 2.55mm 4mm 3mm 2.55mm - Voltage Supply
RS stock no. 888-3030
Mfr. Part No.HI1206T161R-10
R 1.218
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