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. 144-9787
Mfr. Part No.742792097
£0.10
Each (On a Reel of 4000)
Units
0805 - 1500Ω - - - 1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 166-9873
Mfr. Part No.BLM21RK601SN1D
BrandMurata
£0.032
Each (On a Reel of 4000)
Units
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Digital Interface, EMI Suppression Filter
RS Stock No. 144-9788
Mfr. Part No.742792040
£0.10
Each (On a Reel of 4000)
Units
805 - 600Ω - - - 2A 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. 164-5313
Mfr. Part No.BMB2A0300LN2
£0.038
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. 125-3154
Mfr. Part No.BLM21PG331SN1D
BrandMurata
£0.016
Each (On a Reel of 4000)
Units
0805 (2012M) - 330Ω - - - 1.5A Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, Power Supplies
RS Stock No. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
£0.044
Each (In a Pack of 25)
Units
0805 (2012M) - 330Ω - - - 1.5A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 124-1839
Mfr. Part No.742792040
£0.165
Each (In a Pack of 50)
Units
0805 (2012M) - 600Ω - - - 2A 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. 812-0767
Mfr. Part No.BMB2A0300LN2
£0.065
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. 124-1838
Mfr. Part No.742792097
£0.172
Each (In a Pack of 50)
Units
0805 (2012M) - 1500Ω - - - 1A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 724-1567
Mfr. Part No.BLM21RK601SN1D
BrandMurata
£0.078
Each (In a Pack of 25)
Units
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Digital Interface, EMI Suppression Filter
RS Stock No. 125-3119
Mfr. Part No.BLM41PG750SN1L
BrandMurata
£0.087
Each (On a Reel of 2500)
Units
1806 (4516M) - 75Ω - - - 3.5A Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS Stock No. 188-8659
Mfr. Part No.BLM41PG750SN1L
BrandMurata
£0.224
Each (In a Pack of 10)
Units
1806 (4516M) - 75Ω - - - 3.5A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS Stock No. 124-1520
Mfr. Part No.74275013
£0.254
Each (In a Pack of 20)
Units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 124-1869
Mfr. Part No.74279218
£0.167
Each (In a Pack of 50)
Units
1206 (3216M) - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 167-4984
Mfr. Part No.BLM21PG121SN1D
BrandMurata
£0.016
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. 163-3215
Mfr. Part No.7427503
£0.254
Each (In a Bag of 200)
Units
Axial - 600Ω - - - 200mA - 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 260-6830
Mfr. Part No.7427503
£1.00
Each
Units
Axial - 600Ω - - - 200mA Bead 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 792-6300
Mfr. Part No.BLM21PG121SN1D
BrandMurata
£0.044
Each (In a Bag of 25)
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. 144-9805
Mfr. Part No.74279218
£0.116
Each (On a Reel of 3000)
Units
1206 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 144-9786
Mfr. Part No.742792096
£0.054
Each (On a Reel of 4000)
Units
805 - 1000Ω - - - 1A 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