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. 166-9854
Mfr. Part No.BLM18HG102SN1D
BrandMurata
$0.078
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 100mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 167-3811
Mfr. Part No.BLM15EG121SN1D
BrandMurata
$0.10
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - - 1.5A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 166-9855
Mfr. Part No.BLM18HG601SN1D
BrandMurata
$0.078
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 172-8762
Mfr. Part No.CIM10U121NC
$0.038
Each (On a Reel of 10000)
units
0603 (1608M) - 150Ω - - - 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 166-9555
Mfr. Part No.BLM15AG102SN1D
BrandMurata
$0.033
Each (On a Reel of 10000)
units
0402 (1005M) - 1000Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 643-9864
Mfr. Part No.MPZ1005S100CT
BrandTDK
$0.141
Each (In a Pack of 10)
units
0402 (1005M) - - - - - - Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Power Line
RS Stock No. 167-3812
Mfr. Part No.BLM15HD182SN1D
BrandMurata
$0.117
Each (On a Reel of 10000)
units
0402 (1005M) - 180Ω - - - 200mA 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. 104-8510
Mfr. Part No.BLA31AG221SN4D
BrandMurata
$0.667
Each (In a Pack of 10)
units
1206 (3216M) - 220Ω - - - 150mA Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - General Use
RS Stock No. 166-9856
Mfr. Part No.BLM18PG300SN1D
BrandMurata
$0.036
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. 181-4424
Mfr. Part No.MH3261-601Y
BrandBourns
$0.051
Each (On a Reel of 3000)
units
3261 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 164-5637
Mfr. Part No.1-1879855-8
$0.124
Each (On a Reel of 10000)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
$0.036
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
RS Stock No. 144-9841
Mfr. Part No.742792695
$0.228
Each (On a Reel of 4000)
units
0603 - 2500Ω - - - 50mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 167-3813
Mfr. Part No.BLM15HD601SN1D
BrandMurata
$0.084
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 High-speed Signal Lines
RS Stock No. 164-5313
Mfr. Part No.BMB2A0300LN2
$0.08
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 104-8539
Mfr. Part No.BLM21BD272SH1L
BrandMurata
$0.209
Each (In a Pack of 50)
units
0805 (2012M) - 2700Ω - - - 200mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Automotive, Powertrain, Safety
RS Stock No. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
$0.033
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. 863-7304
Mfr. Part No.4-1624116-7
$0.242
Each (In a Bag of 100)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS Stock No. 166-9865
Mfr. Part No.BLM21BB121SN1D
BrandMurata
$0.061
Each (On a Reel of 4000)
units
0805 (2012M) - 120Ω - - - 600mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 749-8299
Mfr. Part No.74279224101
$1.854
Each (In a Bag of 5)
units
2220 (5650M) - 100Ω - - - 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
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