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. 669-4030
Mfr. Part No.742792609
SGD0.212
Each (In a Pack of 10)
units
0603 (1608M) - 30Ω - - - 3A EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 669-4068
Mfr. Part No.742792035
SGD0.297
Each (In a Pack of 10)
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0805 (2012M) - 300Ω - - - 300mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 888-3487
Mfr. Part No.28B0735-300
SGD0.379
Each (In a Pack of 100)
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0735 73Ω 150Ω 270Ω - - - Cylindrical EMI Core 18.67 x 14.27mm 14.27mm - - 18.67mm EMI Suppression
RS Stock No. 166-9870
Mfr. Part No.BLM21PG600SN1D
BrandMurata
SGD0.042
Each (On a Reel of 4000)
units
0805 (2012M) - 60Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1615
Mfr. Part No.BL02RN2R1P1A
BrandMurata
SGD0.244
Each (In a Pack of 25)
units
Radial - - - - - 6A EMI Suppression 9 x 3.4 x 7.5mm 9mm 3.4mm 7.5mm - -
RS Stock No. 125-3124
Mfr. Part No.BLM21AH102SN1D
BrandMurata
SGD0.083
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 888-3320
Mfr. Part No.28A0350-0B2
SGD1.081
Each (In a Pack of 50)
units
0350 100Ω 240Ω 400Ω - - - Snap-On EMI Core, Split EMI Core 13 x 25.5 x 11.7mm 13mm 25.5mm 11.7mm - EMI Suppression
RS Stock No. 747-4717
Mfr. Part No.BLM18BD331SN1D
BrandMurata
SGD0.024
Each (In a Bag of 100)
units
0603 (1608M) - 330Ω - - - 250mA 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. 125-3149
Mfr. Part No.BLM18PG221SN1D
BrandMurata
SGD118.31
1 Reel of 4000
Reel(s)
0603 (1608M) - 220Ω - - - 1.4A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
RS Stock No. 167-4830
Mfr. Part No.BLM15AX100SN1D
BrandMurata
SGD186.45
1 Reel of 10000
Reel(s)
0402 (1005M) - 10Ω - - - 1.74A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 724-1469
Mfr. Part No.BLM21AG102SN1D
BrandMurata
SGD0.094
Each (In a Pack of 25)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 839-0774
Mfr. Part No.BLM15AX100SN1D
BrandMurata
SGD0.024
Each (In a Bag of 100)
units
0402 (1005M) - 10Ω - - - 1.74A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 124-1516
Mfr. Part No.74273002
SGD1.40
Each (In a Pack of 10)
units
Radial 209Ω 249Ω - - - 4A EMI Suppression 10.88 x 5.49 x 10mm 10.88mm 5.49mm 10mm - 4-Line Sensor, Battery Chargers, EMI Suppression, Low Voltage Power Supply, Multi Conductor Systems, Power Electronics
RS Stock No. 163-3560
Mfr. Part No.742792691
SGD568.40
1 Reel of 4000
Reel(s)
0603 (1608M) - 1500Ω - - - 50mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 724-1390
Mfr. Part No.BLM18PG221SN1D
BrandMurata
SGD0.073
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
RS Stock No. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
SGD0.101
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. 888-3096
Mfr. Part No.HR2220P601R-10
SGD0.872
Each (In a Pack of 50)
units
2220 (5650M) 200Ω 600Ω - - 75Ω 4A Chip Bead 5.59 x 5.08 x 3.05mm 5.59mm 5.08mm 3.05mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 163-3535
Mfr. Part No.742792035
SGD796.00
1 Reel of 4000
Reel(s)
0805 (2012M) - 300Ω - - - 300mA 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
SGD0.871
Each (In a Pack of 10)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 863-7095
Mfr. Part No.1879855-4
SGD0.102
Each (In a Bag of 100)
units
0402 (1005M) - 120Ω - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - General Purpose, High frequency
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