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. 166-9861
Mfr. Part No.BLM21AG331SN1D
BrandMurata
R 0.569
Each (On a Reel of 4000)
units
0805 (2012M) - 330Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS stock no. 163-3568
Mfr. Part No.7427932
R 7.681
Each (On a Reel of 500)
units
SMD - 98Ω - - - 6A High Current 7.8 x 4.75 x 3mm 7.8mm 4.75mm 3mm - Voltage Supply
RS stock no. 124-1839
Mfr. Part No.742792040
R 3.363
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. 724-1589
Mfr. Part No.BLM31PG500SN1L
BrandMurata
R 1.729
Each (In a Pack of 25)
units
1206 (3216M) - 50Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 724-1539
Mfr. Part No.BLM21PG220SN1D
BrandMurata
R 0.983
Each (In a Pack of 25)
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. 230-3878
Mfr. Part No.BLM21AH102SN1D
BrandMurata
R 2.102
Each (In a Pack of 20)
units
0805 (2012M) - - - - - - Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS stock no. 124-1868
Mfr. Part No.742792116
R 3.295
Each (In a Pack of 50)
units
1206 (3216M) - 500Ω - - - 2.5A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 870-9326
Mfr. Part No.Z0402C680CSMST
BrandKEMET
R 0.412
Each (In a Pack of 10000)
units
0402 (1005M) - 68Ω - - - 400mA Multilayer Chip Bead 25.4 x 12.7 x 12.7mm 25.4mm 12.7mm 12.7mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS stock no. 125-3124
Mfr. Part No.BLM21AH102SN1D
BrandMurata
R 0.656
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS stock no. 239-595
Mfr. Part No.BL02RN2R1M2B
BrandMurata
R 2.551
Each (In a Pack of 10)
units
Radial - - - - - 7A Bead 9 x 3.4 x 7.5mm 9mm 3.6mm 7.5mm - General Electronics
RS stock no. 888-3052
Mfr. Part No.HI1812V101R-10
R 3.621
Each (In a Pack of 100)
units
1812 (4532M) 45Ω 100Ω - - 134Ω 8A Chip Bead 4.5 x 3.2 x 1.4mm 4.5mm 3.2mm 1.4mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
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. 724-1485
Mfr. Part No.BLM21AG331SN1D
BrandMurata
R 1.333
Each (In a Pack of 25)
units
0805 (2012M) - 330Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS stock no. 144-9804
Mfr. Part No.742792116
R 2.176
Each (On a Reel of 3000)
units
1206 - 500Ω - - - 2.5A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 888-3566
Mfr. Part No.HFA187102-0A2
R 50.046
Each (In a Pack of 10)
units
187102 - - 220Ω - 21Ω - Snap-On EMI Core, Split EMI Core 22.88 x 32.77 x 21.84mm 22.88mm 32.77mm 21.84mm - EMI Suppression
RS stock no. 166-9821
Mfr. Part No.BLM41PG471SN1L
BrandMurata
R 1.754
Each (On a Reel of 2500)
units
1806 (4516M) - 470Ω - - - 2A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS stock no. 144-9845
Mfr. Part No.742792031
R 1.931
Each (On a Reel of 4000)
units
0805 - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 166-9828
Mfr. Part No.BLM31PG500SN1L
BrandMurata
R 1.423
Each (On a Reel of 3000)
units
1206 (3216M) - 50Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 144-9844
Mfr. Part No.742792021
R 1.931
Each (On a Reel of 4000)
units
0805 - 22Ω - - - 6A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 163-4593
Mfr. Part No.742863147
R 8,551.26
Each (On a Reel of 4000)
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