Ferrite Beads

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. 167-4834
Mfr. Part No.BLM15PD600SN1D
BrandMurata
£0.008
Each (On a Reel of 10000)
Units
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
£0.024
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. 161-8072
Mfr. Part No.BLM18AG121SN1D
BrandMurata
£0.01
Each (On a Reel of 4000)
Units
0603 (1608M) - 120Ω - - - 800mA 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. 839-0806
Mfr. Part No.BLM15PD600SN1D
BrandMurata
£0.019
Each (In a Bag of 100)
Units
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS Stock No. 167-4980
Mfr. Part No.BLM18HE152SN1D
BrandMurata
£0.026
Each (On a Reel of 4000)
Units
0603 (1608M) - 1500Ω - - - 500mA 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
RS Stock No. 166-9555
Mfr. Part No.BLM15AG102SN1D
BrandMurata
£0.011
Each (On a Reel of 10000)
Units
0402 (1005M) - 1000Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 125-3120
Mfr. Part No.BLM41PG600SN1L
BrandMurata
£0.088
Each (On a Reel of 2500)
Units
1806 (4516M) - 60Ω - - - 6A Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - EMI Suppression, Power Supplies
RS Stock No. 792-6259
Mfr. Part No.BLM18HE152SN1D
BrandMurata
£0.083
Each (In a Bag of 25)
Units
0603 (1608M) - 1500Ω - - - 500mA 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
RS Stock No. 888-3412
Mfr. Part No.28B0250-700
£0.065
Each (In a Pack of 500)
Units
0250 64Ω 135Ω 255Ω - - - Cylindrical EMI Core 6.35 x 100mm 100mm - - 6.35mm EMI Suppression
RS Stock No. 888-3024
Mfr. Part No.HI1206N101R-10
£0.051
Each (In a Pack of 500)
Units
1206 (3216M) 41Ω 100Ω - - 145Ω 3A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 724-1251
Mfr. Part No.BLM15AG102SN1D
BrandMurata
£0.041
Each (In a Pack of 25)
Units
0402 (1005M) - 1000Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 161-8060
Mfr. Part No.BLM21PG221SH1D
BrandMurata
£0.017
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 - EMI Suppression Filter, Power Supplies
RS Stock No. 188-8665
Mfr. Part No.BLM41PG600SN1L
BrandMurata
£0.157
Each (In a Pack of 10)
Units
1806 (4516M) - 60Ω - - - 6A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - EMI Suppression, Power Supplies
RS Stock No. 669-4049
Mfr. Part No.742792602
£0.154
Each (In a Pack of 10)
Units
0603 (1608M) - 60Ω - - - 3A EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 792-6312
Mfr. Part No.BLM21PG221SH1D
BrandMurata
£0.062
Each (In a Bag 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. 202-3550
Mfr. Part No.BLM18AG121SN1D
BrandMurata
£0.031
Each (In a Pack of 20)
Units
0603 (1608M) - 120Ω - - - 500mA 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. 166-9857
Mfr. Part No.BLM18PG331SN1D
BrandMurata
£0.011
Each (On a Reel of 4000)
Units
0603 (1608M) - 330Ω - - - 1.2A 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. 172-9975
Mfr. Part No.2944666631
BrandFair-Rite
£0.182
Each (In a Box of 200)
Units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 166-9557
Mfr. Part No.BLM15AG601SN1D
BrandMurata
£0.01
Each (On a Reel of 10000)
Units
0402 (1005M) - 600Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 724-1526
Mfr. Part No.BLM21BD272SN1L
BrandMurata
£0.116
Each (In a Pack of 25)
Units
0805 (2012M) - 2700Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
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