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. 724-1463
Mfr. Part No.BLM21AG121SN1D
BrandMurata
$0.128
Each (In a Pack of 25)
units
0805 (2012M) - 120Ω - - - 1A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 724-1494
Mfr. Part No.BLM21AG601SN1D
BrandMurata
$0.13
Each (In a Pack of 25)
units
0805 (2012M) - 600Ω - - - 700mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 166-9871
Mfr. Part No.BLM21RK102SN1D
BrandMurata
$0.06
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Digital Interface, EMI Suppression Filter
RS Stock No. 166-9869
Mfr. Part No.BLM21PG300SN1D
BrandMurata
$0.043
Each (On a Reel of 4000)
units
0805 (2012M) - 30Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 812-0777
Mfr. Part No.BMB2A0120AN4
$0.042
Each (In a Bag of 100)
units
0805 (2012M) - 120Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - EMI Filtering, General Electronics
RS Stock No. 749-8328
Mfr. Part No.74279226101
$0.978
Each (In a Bag of 5)
units
1812 (4532M) - 100Ω - - - 8A Bead 4.5 x 3.2 x 2.3mm 4.5mm 3.2mm 2.3mm - EMI Suppression, High Current
RS Stock No. 604-1984
Mfr. Part No.MMZ2012S800AT
BrandTDK
$0.153
Each (In a Pack of 10)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
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. 839-0819
Mfr. Part No.BLM18KG300TN1D
BrandMurata
$0.055
Each (In a Bag of 100)
units
0603 (1608M) - 30Ω - - - 5A Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 787-9967
Mfr. Part No.742792118
$0.342
Each (In a Bag of 10)
units
1206 (3216M) - 600Ω - - - 2.5A EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 166-9867
Mfr. Part No.BLM21BB600SN1D
BrandMurata
$0.055
Each (On a Reel of 4000)
units
0805 (2012M) - 60Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 166-9763
Mfr. Part No.BLM21AJ601SN1D
BrandMurata
$0.082
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 663-5545
Mfr. Part No.BLM15BD182SN1D
BrandMurata
$0.063
Each (In a Pack of 100)
units
0402 - 1800Ω - - - 100mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 899-7299
Mfr. Part No.74275223
$2.744
Each (In a Bag of 5)
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. 124-1840
Mfr. Part No.742792064
$0.193
Each (In a Pack of 100)
units
0805 (2012M) - 75Ω - 300Ω - 300mA 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. 358-6844
Mfr. Part No.742792131
$0.379
Each (In a Pack of 10)
units
1206 (3216M) - 600Ω - - - 200mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 166-9861
Mfr. Part No.BLM21AG331SN1D
BrandMurata
$0.057
Each (On a Reel of 4000)
units
0805 (2012M) - 330Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 144-9851
Mfr. Part No.74279252
$0.367
Each (On a Reel of 1000)
units
1812 - 880Ω - - - 4A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - Suppression Components
RS Stock No. 163-3214
Mfr. Part No.74275022
$0.468
Each (In a Bag of 200)
units
Axial - - - - - - - 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 724-1337
Mfr. Part No.BLM18EG601SN1D
BrandMurata
$0.204
Each (In a Pack of 25)
units
0603 (1608M) - 600Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
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