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. 888-3361
Mfr. Part No.28A2029-0A2
MYR6.216
Each (In a Pack of 50)
units
2029 95Ω 250Ω 420Ω - - - Cylindrical EMI Core 22.28 x 32.77 x 21.84mm 22.28mm 32.77mm 21.84mm - EMI Suppression
RS Stock No. 669-4083
Mfr. Part No.742792011
MYR0.879
Each (In a Pack of 10)
units
0805 (2012M) - 10Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 683-5247
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
MYR5.716
Each (In a Pack of 10)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 170-4654
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
MYR2.452
Each (On a Reel of 1000)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 839-0792
Mfr. Part No.BLM15GG471SN1D
BrandMurata
MYR0.978
Each (In a Bag of 10)
units
0402 (1005M) - 470Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High-GHz Band General Use
RS Stock No. 839-0780
Mfr. Part No.BLM15GA750SN1D
BrandMurata
MYR1.17
Each (In a Bag of 10)
units
0402 (1005M) - 75Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High-GHz Band High-speed signal lines
RS Stock No. 144-9784
Mfr. Part No.742792641
MYR0.357
Each (On a Reel of 4000)
units
603 - 300Ω - - - 2A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 166-9866
Mfr. Part No.BLM21BB221SN1D
BrandMurata
MYR0.151
Each (On a Reel of 4000)
units
0805 (2012M) - 220Ω - - - 500mA 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. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
MYR0.223
Each (In a Pack of 20)
units
0603 (1608M) - 1000Ω - - - 450mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, General Use
RS Stock No. 888-3339
Mfr. Part No.28A0593-0A2
MYR4.71
Each (In a Pack of 50)
units
0593 186Ω 407Ω 575Ω - - - Snap-On EMI Core, Split EMI Core 18.75 x 52.91mm 52.91mm - - 18.75mm EMI Suppression
RS Stock No. 144-9874
Mfr. Part No.7427927311
MYR0.357
Each (On a Reel of 10000)
units
0402 - 120Ω - - - 1.2mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
MYR0.085
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. 167-4984
Mfr. Part No.BLM21PG121SN1D
BrandMurata
MYR0.10
Each (On a Reel of 4000)
units
0805 (2012M) - 120Ω - - - 3mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1504
Mfr. Part No.BLM21BB221SN1D
BrandMurata
MYR0.345
Each (In a Pack of 25)
units
0805 (2012M) - 220Ω - - - 500mA 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. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
MYR0.082
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 450mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 724-1582
Mfr. Part No.BLM31PG601SN1L
BrandMurata
MYR0.699
Each (In a Pack of 25)
units
1206 (3216M) - 600Ω - - - 1.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 749-8299
Mfr. Part No.74279224101
MYR4.46
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
RS Stock No. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
MYR0.169
Each (In a Pack of 25)
units
0402 (1005M) - 220Ω - - - 450mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 109-4151
Mfr. Part No.MPZ1608S221AT
BrandTDK
MYR0.145
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - - 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - -
RS Stock No. 788-0036
Mfr. Part No.7427927112
MYR0.723
Each (In a Bag of 10)
units
0402 (1005M) - 120Ω - - - 350mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components