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 50 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
RS Stock No. 169-2760
Mfr. Part No.BLM18EG601SH1D
BrandMurata
$0.14
Each (On a Reel of 4000)
units
0603 (1608M) - - 600Ω - - 700Ω 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -
RS Stock No. 124-8154
Mfr. Part No.BLM18EG601SH1D
BrandMurata
$0.205
Each (In a Pack of 100)
units
0603 (1608M) - - 600Ω - - 700Ω 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -
RS Stock No. 724-1463
Mfr. Part No.BLM21AG121SN1D
BrandMurata
$0.141
Each (In a Pack of 25)
units
0805 (2012M) - - 120Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 166-9860
Mfr. Part No.BLM21AG121SN1D
BrandMurata
$0.054
Each (On a Reel of 4000)
units
0805 (2012M) - - 120Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 786-5069
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.084
Each (In a Bag of 100)
units
0805 (2012M) - - 1500Ω - - - 500mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 109-4157
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.05
Each (On a Reel of 4000)
units
0805 (2012M) - - 1500Ω - - - 500mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 166-9873
Mfr. Part No.BLM21RK601SN1D
BrandMurata
$0.071
Each (On a Reel of 4000)
units
0805 (2012M) - - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 724-1567
Mfr. Part No.BLM21RK601SN1D
BrandMurata
$0.165
Each (In a Pack of 25)
units
0805 (2012M) - - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 604-2022
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.121
Each (In a Pack of 10)
units
0805 (2012M) - - 1500Ω - - - 500mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 144-9786
Mfr. Part No.742792096
$0.278
Each (On a Reel of 4000)
units
0805 - - 1000Ω - - - 1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm -
RS Stock No. 122-5323
Mfr. Part No.BLM18PG331SH1D
BrandMurata
$0.046
Each (On a Reel of 4000)
units
0603 (1608M) - - 330Ω - - - 1.2A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -
RS Stock No. 169-6381
Mfr. Part No.BLM15BB221SN1D
BrandMurata
$0.034
Each (On a Reel of 10000)
units
0402 (1005M) - - 220Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm -
RS Stock No. 124-1837
Mfr. Part No.742792096
$0.33
Each (In a Pack of 50)
units
0805 (2012M) - - 1000Ω - - - 1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm -
RS Stock No. 792-6202
Mfr. Part No.BLM15BB221SN1D
BrandMurata
$0.081
Each (In a Bag of 25)
units
0402 (1005M) - - 220Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm -
RS Stock No. 724-1328
Mfr. Part No.BLM18EG221SN1D
BrandMurata
$0.237
Each (In a Pack of 25)
units
0603 (1608M) - - 220Ω - - 300Ω 1A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -
RS Stock No. 125-3147
Mfr. Part No.BLM18EG221SN1D
BrandMurata
$0.139
Each (On a Reel of 4000)
units
0603 (1608M) - - 220Ω - - 300Ω 1A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -
RS Stock No. 467-3781
Mfr. Part No.2944777741
BrandFair-Rite
$1.626
Each (In a Pack of 5)
units
Axial - - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm
RS Stock No. 161-8060
Mfr. Part No.BLM21PG221SH1D
BrandMurata
$0.083
Each (On a Reel of 4000)
units
0805 (2012M) - - 220Ω - - - 2A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm -
RS Stock No. 172-9984
Mfr. Part No.2944777741
BrandFair-Rite
$1.028
Each (In a Box of 79)
units
Axial - - 500Ω - - - - Bead 10 (Dia.) x 10mm 10mm - - 10mm
RS Stock No. 124-1843
Mfr. Part No.742861210
$0.38
Each (In a Pack of 20)
units
0603 (1608M) - - 1000Ω - - 1100Ω 50mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm -