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. 166-9844
Mfr. Part No.BLM18BB121SN1D
BrandMurata
SGD0.03
Each (On a Reel of 4000)
units
0603 (1608M) - 120Ω - - - 550mA 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. 161-8080
Mfr. Part No.BLM31AF700SN1L
BrandMurata
SGD250.95
1 Reel of 2500
Reel(s)
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
SGD0.059
Each (In a Pack of 25)
units
0603 (1608M) - 470Ω - - - 1A 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. 230-3907
Mfr. Part No.BLM31AF700SN1L
BrandMurata
SGD0.183
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. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
SGD118.31
1 Reel of 4000
Reel(s)
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. 163-3212
Mfr. Part No.742730023
SGD3.215
Each (In a Tube of 40)
units
Radial - 338Ω - - - - Multi Line 11 x 11.2 x 11.2mm 11.2mm 11.2mm 11mm - EMI Suppression, General Electronics
RS Stock No. 358-6591
Mfr. Part No.742730023
SGD2.44
Each
units
Radial - 338Ω - - - - Multi Line 11 x 11.2 x 11.2mm 11.2mm 11.2mm 11mm - EMI Suppression, General Electronics
RS Stock No. 888-3257
Mfr. Part No.MI0805K400R-10
SGD0.057
Each (In a Pack of 500)
units
0805 (2012M) 19Ω 40Ω - - 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. 888-3373
Mfr. Part No.28A2432-0A2
SGD1.082
Each (In a Pack of 50)
units
2432 62Ω 160Ω 300Ω - - - Snap-On EMI Core, Split EMI Core 19.2 x 19.9mm 19.9mm - - 19.2mm EMI Suppression
RS Stock No. 146-0716
Mfr. Part No.7427927218
SGD0.253
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
RS Stock No. 144-9814
Mfr. Part No.74279204
SGD0.199
Each (On a Reel of 4000)
units
0805 - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS Stock No. 144-9798
Mfr. Part No.74279202
SGD424.00
1 Reel of 4000
Reel(s)
805 - 120Ω - - - 500mA Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - 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. 812-0764
Mfr. Part No.BMB2A0060LN2
SGD0.118
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 604-2224
Mfr. Part No.MPZ2012S300AT
BrandTDK
SGD0.136
Each (In a Pack of 10)
units
0805 - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Power Line
RS Stock No. 161-6309
Mfr. Part No.BMB2A0060LN2
SGD0.069
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
RS Stock No. 888-3358
Mfr. Part No.28A2024-0A2
SGD2.303
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. 888-3030
Mfr. Part No.HI1206T161R-10
SGD0.087
Each (In a Pack of 500)
units
1206 (3216M) 71Ω 160Ω - - 127Ω 6A 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. 888-3074
Mfr. Part No.HI2220Q401R-10
SGD0.529
Each (In a Pack of 50)
units
2220 (5650M) 100Ω 400Ω - - 99Ω 4.5A Chip Bead 5.59 x 5.08 x 3.2mm 5.59mm 5.08mm 3.2mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 144-9866
Mfr. Part No.742792118
SGD682.20
1 Reel of 3000
Reel(s)
1206 - 600Ω - - - 2.5A EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 812-0767
Mfr. Part No.BMB2A0300LN2
SGD0.12
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
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