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 500 MHz Impedance at 1 GHz Current Rating Type Dimensions Length Depth Height Diameter Application Material
RS Stock No. 792-6255
Mfr. Part No.BLM18HE102SN1D
BrandMurata
$0.201
Each (In a Bag of 25)
units
0603 (1608M) - 1000Ω - - 600mA 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 Ferrite
RS Stock No. 604-1899
Mfr. Part No.MMZ2012R301AT
BrandTDK
$0.154
Each (In a Pack of 10)
units
0805 (2012M) - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line Ferrite
RS Stock No. 163-7379
Mfr. Part No.74279220321
$0.334
Each (On a Reel of 4000)
units
0805 (2012M) - 320Ω - - 2.5A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 0.9mm 1.2mm - DC/DC Converter, High Current, Power Supply -
RS Stock No. 164-5829
Mfr. Part No.4-1624116-5
$0.117
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - - Ferrite
RS Stock No. 161-6309
Mfr. Part No.BMB2A0060LN2
$0.079
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 Ferrite
RS Stock No. 747-4726
Mfr. Part No.BLM18KG471SN1D
BrandMurata
$0.058
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 Ferrite
RS Stock No. 166-9764
Mfr. Part No.BLM21BD601SN1D
BrandMurata
$0.064
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 - EMI Suppression Filter, High Speed Signal Lines -
RS Stock No. 146-0667
Mfr. Part No.7427925
$0.429
Each (In a Pack of 20)
units
1812 (4532M) - 120Ω - - 300mA Ferrite Bead 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - - Ferrite
RS Stock No. 122-5321
Mfr. Part No.BLM18PG221SH1D
BrandMurata
$0.042
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - 1.4A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety Ferrite
RS Stock No. 163-7380
Mfr. Part No.74279220601
$0.334
Each (On a Reel of 4000)
units
0805 (2012M) - 600Ω - - 2.1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 0.9mm 1.2mm - DC/DC Converter, High Current, Power Supply -
RS Stock No. 787-9951
Mfr. Part No.742792095
$0.331
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 Ferrite
RS Stock No. 146-0716
Mfr. Part No.7427927218
$0.293
Each (In a Pack of 50)
units
0402 (1005M) - 180Ω 260Ω - 400mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Data Line Filter, Uncoupling of Distribution Voltage Ferrite
RS Stock No. 124-1841
Mfr. Part No.742792141
$0.362
Each (In a Pack of 50)
units
1206 (3216M) - 1000Ω - - 1A 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 Ferrite
RS Stock No. 109-4152
Mfr. Part No.MMZ1608S601AT
BrandTDK
$0.032
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line S
RS Stock No. 164-5830
Mfr. Part No.4-1624116-6
$0.117
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - - Ferrite
RS Stock No. 669-4008
Mfr. Part No.742792622
$0.30
Each (In a Pack of 10)
units
0603 (1608M) - 180Ω - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components Ferrite
RS Stock No. 162-0099
Mfr. Part No.BMB2A1000BN3
$0.122
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - - Chip Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Frequency -
RS Stock No. 669-3992
Mfr. Part No.742792653
$0.298
Each (In a Pack of 10)
units
0603 (1608M) - 600Ω - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components Ferrite
RS Stock No. 110-100
Mfr. Part No.BLM15HB221SN1D
BrandMurata
$0.17
Each (In a Bag of 25)
units
0402 (1005M) - 22Ω - - 250mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band High-speed Signal Lines Ferrite
RS Stock No. 167-3808
Mfr. Part No.BLM15BB750SN1D
BrandMurata
$0.034
Each (On a Reel of 10000)
units
0402 (1005M) - 75Ω - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High Speed Signal Lines Ferrite
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