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

DVDs

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. 888-3459
Mfr. Part No.28B0562-200
£0.304
Each (In a Pack of 50)
Units
0562 159Ω 294Ω 439Ω - - - Cylindrical EMI Core 14.27 x 28.58mm 28.58mm - - 14.27mm EMI Suppression
RS Stock No. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
£0.045
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. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
£0.013
Each (On a Reel of 4000)
Units
0603 (1608M) - 1000Ω - - - 450mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 124-1834
Mfr. Part No.742792641
£0.13
Each (In a Pack of 50)
Units
0603 (1608M) - 300Ω - - - 2A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 144-9784
Mfr. Part No.742792641
£0.065
Each (On a Reel of 4000)
Units
603 - 300Ω - - - 2A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 749-8296
Mfr. Part No.74279223560
£0.462
Each (In a Bag of 5)
Units
1612 (4131M) - 56Ω - - - 10A Bead 4.06 x 3.05 x 2.28mm 4.06mm 3.05mm 2.28mm - EMI Suppression, High Current
RS Stock No. 166-9826
Mfr. Part No.BLM31PG121SN1L
BrandMurata
£0.065
Each (On a Reel of 3000)
Units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 172-9955
Mfr. Part No.2743003112
BrandFair-Rite
£0.054
Each (On a Reel of 4500)
Units
Axial 65Ω 100Ω - - - - Bead 3.5 (Dia.) x 6.7mm 6.7mm - - 3.5mm EMI Suppression
RS Stock No. 144-9808
Mfr. Part No.742792410
£0.147
Each (On a Reel of 2000)
Units
1806 - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - 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. 669-4099
Mfr. Part No.742792022
£0.169
Each (In a Pack of 10)
Units
0805 (2012M) - 220Ω - - - 2A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 467-3321
Mfr. Part No.2743003112
BrandFair-Rite
£0.091
Each (In a Pack of 50)
Units
Axial 65Ω 100Ω - - - - Bead 3.5 (Dia.) x 6.7mm 6.7mm - - 3.5mm EMI Suppression
RS Stock No. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
£0.19
Each (In a Pack of 25)
Units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 124-1873
Mfr. Part No.742792410
£0.219
Each (In a Pack of 50)
Units
1806 (4516M) - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - 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. 144-9845
Mfr. Part No.742792031
£0.10
Each (On a Reel of 4000)
Units
0805 - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 124-1835
Mfr. Part No.742792651
£0.13
Each (In a Pack of 50)
Units
0603 (1608M) - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 239-595
Mfr. Part No.BL02RN2R1M2B
BrandMurata
£0.111
Each (In a Pack of 10)
Units
Radial - - - - - 7A Bead 9 x 3.4 x 7.5mm 9mm 3.6mm 7.5mm - General Electronics
RS Stock No. 124-1518
Mfr. Part No.7427504
£0.254
Each (In a Pack of 20)
Units
Axial 702Ω 773Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 144-9785
Mfr. Part No.742792651
£0.065
Each (On a Reel of 4000)
Units
603 - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 669-4092
Mfr. Part No.742792031
£0.169
Each (In a Pack of 10)
Units
0805 (2012M) - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
£0.012
Each (On a Reel of 4000)
Units
0603 (1608M) - 470Ω - - - 1A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
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