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. 166-9856
Mfr. Part No.BLM18PG300SN1D
BrandMurata
R 0.259
Each (On a Reel of 4000)
units
0603 (1608M) - 30Ω - - - 1A 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. 167-4200
Mfr. Part No.BLM18EG101TN1D
BrandMurata
R 0.466
Each (On a Reel of 4000)
units
0603 (1608M) - 100Ω - - - 2A 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. 786-5065
Mfr. Part No.MMZ2012Y102BT
BrandTDK
R 0.546
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
RS stock no. 888-3513
Mfr. Part No.28F0181-1SR-10
R 3.642
Each (In a Pack of 100)
units
3818 (9646M) 72Ω 115Ω - - 123Ω 10A Bead 4.57 x 2.54 x 8.51mm 4.57mm 2.54mm 8.51mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS stock no. 166-9561
Mfr. Part No.BLM15HG601SN1D
BrandMurata
R 0.303
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 General Use
RS stock no. 167-4986
Mfr. Part No.BLM21PG220SH1D
BrandMurata
R 0.592
Each (On a Reel of 4000)
units
0805 (2012M) - 22Ω - - - 6A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 125-3118
Mfr. Part No.BLM41PF800SN1L
BrandMurata
R 2.132
Each (On a Reel of 2500)
units
1806 (4516M) - - - - - - Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - General Electronics
RS stock no. 888-3525
Mfr. Part No.28L0138-70R-10
R 1.123
Each (In a Pack of 500)
units
Axial 123Ω 220Ω - - 110Ω 5A Filter 3.51 (Dia.) x 13.97mm 13.97mm - - 3.51mm Automotive, CD-TV, Telecom, Test Equipment
RS stock no. 787-9998
Mfr. Part No.742792620
R 2.279
Each (In a Bag of 10)
units
0603 (1608M) - 100Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 888-3440
Mfr. Part No.28B0562-100
R 2.848
Each (In a Pack of 500)
units
0562 89Ω 184Ω 303Ω - - - Cylindrical EMI Core 14.27 x 13.46mm 13.46mm - - 14.27mm EMI Suppression
RS stock no. 166-9850
Mfr. Part No.BLM18GG471SN1D
BrandMurata
R 0.957
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High-GHz Band General Use
RS stock no. 110-532
Mfr. Part No.BLM18BA100SN1D
BrandMurata
R 0.687
Each (In a Bag of 25)
units
0603 (1608M) - 10Ω - - - 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - General Electronics
RS stock no. 788-0134
Mfr. Part No.742862160
R 3.838
Each (In a Bag of 10)
units
0603 (1608M) - 660Ω - - - 100mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Highspeed Bus Systems, Suppression Components
RS stock no. 669-4171
Mfr. Part No.74279252
R 4.594
Each (In a Pack of 10)
units
1812 (4532M) - 880Ω - - - 4A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - Suppression Components
RS stock no. 124-1838
Mfr. Part No.742792097
R 3.291
Each (In a Pack of 50)
units
0805 (2012M) - 1500Ω - - - 1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 888-3569
Mfr. Part No.HFA259131-0A2
R 113.18
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. 787-9951
Mfr. Part No.742792095
R 3.005
Each (In a Bag of 10)
units
0805 (2012M) - 2700Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 888-3465
Mfr. Part No.28B0570-000
R 1.672
Each (In a Pack of 500)
units
0570 32Ω 82Ω 200Ω - - - Cylindrical EMI Core 14.48 x 5.51mm 5.51mm - - 14.48mm EMI Suppression
RS stock no. 724-1286
Mfr. Part No.BLM15HG102SN1D
BrandMurata
R 1.098
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 General Use
RS stock no. 358-6844
Mfr. Part No.742792131
R 4.803
Each (In a Pack of 10)
units
1206 (3216M) - 600Ω - - - 200mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics