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


DVD’s


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. 172-9955
Mfr. Part No.2743003112
BrandFair-Rite
$0.204
Each (On a Reel of 4500)
units
Axial 65Ω 100Ω - - - - Bead 3.5 (Dia.) x 6.7mm 6.7mm - - 3.5mm EMI Suppression
RS Stock No. 863-7161
Mfr. Part No.3-1624116-8
$0.201
Each (In a Bag of 100)
units
0603 (1608M) - 1200Ω - - - 100mA Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - General Purpose, High frequency
RS Stock No. 144-9818
Mfr. Part No.742792514
$0.335
Each (On a Reel of 1000)
units
1812 - 600Ω - - - 3A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - General Electronics
RS Stock No. 811-9792
Mfr. Part No.BLM18BD221SN1D
BrandMurata
$0.091
Each (In a Bag of 25)
units
0603 (1608M) - 220Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 792-6303
Mfr. Part No.BLM21AG471SN1D
BrandMurata
$0.134
Each (In a Bag of 25)
units
0805 (2012M) - 470Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 863-7394
Mfr. Part No.6-1624116-2
$0.201
Each (In a Bag of 100)
units
0603 (1608M) - 330Ω - - - 1.5A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS Stock No. 163-4579
Mfr. Part No.7427927160
$0.234
Each (On a Reel of 10000)
units
0402 (1005M) - 60Ω - - - 400mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 122-5335
Mfr. Part No.BLM31PG330SH1L
BrandMurata
$0.157
Each (On a Reel of 3000)
units
1206 (3216M) - 33Ω - - - 6A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Automotive, Powertrain, Safety
RS Stock No. 164-5879
Mfr. Part No.5-1624117-8
$0.15
Each (On a Reel of 4000)
units
0805 (2012M) - 10Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Current, Noise Filtering
RS Stock No. 144-9819
Mfr. Part No.742792041
$0.275
Each (On a Reel of 4000)
units
0805 - 600Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.24mm 0.9mm - General Electronics
RS Stock No. 144-9851
Mfr. Part No.74279252
$0.345
Each (On a Reel of 1000)
units
1812 - 880Ω - - - 4A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - Suppression Components
RS Stock No. 724-1273
Mfr. Part No.BLM15EG221SN1D
BrandMurata
$0.188
Each (In a Pack of 25)
units
0402 (1005M) - 220Ω - - 270Ω 700mA 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. 839-0777
Mfr. Part No.BLM03AX601SN1D
BrandMurata
$0.143
Each (In a Bag of 50)
units
0201 (0603M) - 600Ω - - - 250mA Chip Ferrite Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - EMI Suppression Filter, General Use
RS Stock No. 122-5300
Mfr. Part No.BLA31BD102SN4D
BrandMurata
$0.309
Each (On a Reel of 4000)
units
1206 (3216M) - 1000Ω - - - 50mA Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - General Electronics
RS Stock No. 863-7105
Mfr. Part No.1879855-5
$0.112
Each (In a Bag of 100)
units
0402 (1005M) - 220Ω - - - 300mA Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - General Purpose, High frequency
RS Stock No. 167-4980
Mfr. Part No.BLM18HE152SN1D
BrandMurata
$0.093
Each (On a Reel of 4000)
units
0603 (1608M) - 1500Ω - - 1500Ω 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band High-Speed Signal Line
RS Stock No. 122-5327
Mfr. Part No.BLM21AG601SH1D
BrandMurata
$0.069
Each (On a Reel of 4000)
units
0805 (2012M) - 600Ω - - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Automotive, Powertrain, Safety
RS Stock No. 787-9998
Mfr. Part No.742792620
$0.253
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. 863-7341
Mfr. Part No.5-1624117-8
$0.183
Each (In a Bag of 100)
units
0805 (2012M) - 10Ω - - - 6A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Current, Noise Filtering
RS Stock No. 724-1390
Mfr. Part No.BLM18PG221SN1D
BrandMurata
$0.088
Each (In a Pack of 25)
units
0603 (1608M) - 220Ω - - - 1.4A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies