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

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. 163-3531
Mfr. Part No.7427920
$0.24
Each (On a Reel of 4000)
units
0805 (2012M) - 11Ω - - - 600mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 144-9865
Mfr. Part No.742792095
$0.24
Each (On a Reel of 4000)
units
0805 - 2700Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 863-0870
Mfr. Part No.74279221601
$0.673
Each (In a Bag of 10)
units
1206 (3216M) - 600Ω - - - 2.5A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.1mm 1.6mm - DC/DC Converter, High Current, Power Supply
RS Stock No. 163-3568
Mfr. Part No.7427932
$0.787
Each (On a Reel of 500)
units
SMD - 98Ω - - - 6A High Current 7.8 x 4.75 x 3mm 7.8mm 4.75mm 3mm - Voltage Supply
RS Stock No. 164-5798
Mfr. Part No.3-1624116-7
$0.162
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - -
RS Stock No. 167-3811
Mfr. Part No.BLM15EG121SN1D
BrandMurata
$0.09
Each (On a Reel of 10000)
units
0402 (1005M) - 120Ω - - - 1.5A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 166-9848
Mfr. Part No.BLM18BD252SN1D
BrandMurata
$0.034
Each (On a Reel of 4000)
units
0603 (1608M) - 2500Ω - - - 150mA 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. 144-9785
Mfr. Part No.742792651
$0.155
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. 167-4958
Mfr. Part No.BLM15BD182SN1D
BrandMurata
$0.04
Each (On a Reel of 10000)
units
0402 (1005M) - 1800Ω - - - 100mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - High Speed Signal Lines
RS Stock No. 167-4942
Mfr. Part No.BLM18EG331TN1D
BrandMurata
$0.093
Each (On a Reel of 4000)
units
0603 (1608M) - 330Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 724-1390
Mfr. Part No.BLM18PG221SN1D
BrandMurata
$0.076
Each (In a Pack of 25)
units
0603 (1608M) - 220Ω - - - 1.4A 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. 604-2195
Mfr. Part No.MPZ1608Y600B
BrandTDK
$0.153
Each (In a Pack of 10)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Power Line
RS Stock No. 172-9959
Mfr. Part No.2761008112
BrandFair-Rite
$0.222
Each (On a Reel of 4500)
units
Axial - 134Ω - - - - Bead 3.5 (Dia.) x 11.4mm 11.4mm - - 3.5mm EMI Suppression
RS Stock No. 166-9841
Mfr. Part No.BLM18AG471SN1D
BrandMurata
$0.031
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 550mA 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. 736-2112
Mfr. Part No.7427932
$0.945
Each (In a Bag of 10)
units
SMD - 98Ω - - - 6A High Current 7.8 x 4.75 x 3mm 7.8mm 4.75mm 3mm - Voltage Supply
RS Stock No. 144-9866
Mfr. Part No.742792118
$0.232
Each (On a Reel of 3000)
units
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. 467-3450
Mfr. Part No.2761008112
BrandFair-Rite
$0.221
Each (In a Pack of 25)
units
Axial - 134Ω - - - - Bead 3.5 (Dia.) x 11.4mm 11.4mm - - 3.5mm EMI Suppression
RS Stock No. 167-4909
Mfr. Part No.BLA2ABD121SN4D
BrandMurata
$0.205
Each (On a Reel of 10000)
units
0804 (2010M) - 120Ω - - - 200mA Chip Ferrite Bead 2 x 1 x 0.5mm 2mm 1mm 0.5mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 163-7795
Mfr. Part No.74275223
$1.53
Each (In a Bag of 200)
units
Axial 720Ω 1240Ω - - - 3A Ferrite Bead 6 (Dia.) x 15mm - - 15mm 6mm Protection Against Radio Frequency Interferences of Components on PCB's of PC's, Text Processing and Other Digital Devices
RS Stock No. 125-3156
Mfr. Part No.BLM31PG330SN1L
BrandMurata
$0.133
Each (On a Reel of 3000)
units
1206 (3216M) - 33Ω - - - 6A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
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