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. 888-3358
Mfr. Part No.28A2024-0A2
€2.291
Each (In a Pack of 10)
units
2024 130Ω 280Ω 440Ω - - - EMI Cable Core 29 x 32.5 x 29.62mm 29mm 32.5mm 29.62mm - EMI Suppression
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
€0.059
Each (In a Pack of 25)
units
0805 (2012M) - 220Ω - - - 2A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 888-3355
Mfr. Part No.28A2025-0A2
€0.707
Each (In a Pack of 50)
units
2025 130Ω 320Ω 510Ω - - - Snap-On EMI Core, Split EMI Core 18.15 x 32.5 x 18.9mm 18.15mm 32.5mm 18.9mm - EMI Suppression
RS Stock No. 888-3327
Mfr. Part No.28A0434-0A2
€0.645
Each (In a Pack of 50)
units
0434 111Ω 277Ω 449Ω - - - Snap-On EMI Core, Split EMI Core 14.71 x 43mm 43mm - 14.7mm 14.71mm EMI Suppression
RS Stock No. 169-2760
Mfr. Part No.BLM18EG601SH1D
BrandMurata
€0.063
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 - Automotive
RS Stock No. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
€0.044
Each (In a Pack of 25)
units
0603 (1608M) - 120Ω - - - 2A 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. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
€0.009
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - - 550mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 747-4710
Mfr. Part No.BLM18KG121TN1D
BrandMurata
€0.029
Each (In a Bag of 100)
units
0603 (1608M) - 120Ω - - - 3A Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 124-1520
Mfr. Part No.74275013
€0.287
Each (In a Pack of 20)
units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 170-4654
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
€0.395
Each (On a Reel of 1000)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 683-5247
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
€0.939
Each (In a Pack of 10)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
€0.03
Each (In a Pack of 25)
units
0402 (1005M) - 120Ω - - - 550mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 124-8154
Mfr. Part No.BLM18EG601SH1D
BrandMurata
€0.07
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 - Automotive
RS Stock No. 230-3907
Mfr. Part No.BLM31AF700SN1L
BrandMurata
€0.137
Each (In a Pack of 20)
units
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 166-9561
Mfr. Part No.BLM15HG601SN1D
BrandMurata
€0.017
Each (On a Reel of 10000)
units
0402 (1005M) - 600Ω - - 1400Ω 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 163-3528
Mfr. Part No.7427511
€0.897
Each (On a Reel of 1000)
units
SMD 272Ω 416Ω - - - 5A Bead 8 x 5 x 4.6mm 8mm 5mm 4.6mm - EMI Suppression, RFI Suppression
RS Stock No. 124-1521
Mfr. Part No.74275043
€0.357
Each (In a Pack of 20)
units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Protection Against Radio Frequency Interferences of Components on PCB's of PC's, Text Processing and Other Digital Devices
RS Stock No. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
€0.014
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
RS Stock No. 888-3257
Mfr. Part No.MI0805K400R-10
€0.045
Each (In a Pack of 500)
units
0805 (2012M) 19Ω 40Ω - 60Ω 63Ω 1.5A Chip Bead 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 792-6280
Mfr. Part No.BLM18SG260TN1D
BrandMurata
€0.066
Each (In a Bag of 25)
units
0603 (1608M) - 26Ω - - - 6A Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)