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. 169-6263
Mfr. Part No.BLM21PG331SN1J
BrandMurata
$0.065
Each (On a Reel of 10000)
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. 166-9854
Mfr. Part No.BLM18HG102SN1D
BrandMurata
$0.07
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 100mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 260-6830
Mfr. Part No.7427503
$2.07
Each
units
Axial - 600Ω - - - 200mA Bead 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 169-2672
Mfr. Part No.BLM18BA121SN1D
BrandMurata
$0.034
Each (On a Reel of 4000)
units
0603 (1608M) - 120Ω - - - 200mA 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. 144-9872
Mfr. Part No.742792664
$0.171
Each (On a Reel of 4000)
units
0603 - 1000Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 604-2224
Mfr. Part No.MPZ2012S300AT
BrandTDK
$0.154
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. 163-3215
Mfr. Part No.7427503
$0.572
Each (In a Bag of 200)
units
Axial - 600Ω - - - 200mA - 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 230-3828
Mfr. Part No.BLM21BD601SN1D
BrandMurata
$0.145
Each (In a Pack of 20)
units
0805 (2012M) - 600Ω - - - 200mA 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. 166-9847
Mfr. Part No.BLM18BD102SN1D
BrandMurata
$0.034
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 200mA 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. 724-1627
Mfr. Part No.BL03RN2R1M1B
BrandMurata
$0.258
Each (In a Pack of 25)
units
Radial - - - - - 6A EMI Suppression 8.3 x 2.3 x 6.5mm 8.3mm 2.3mm 6.5mm - -
RS Stock No. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
$0.09
Each (In a Pack of 25)
units
0603 (1608M) - 120Ω - - - 2A 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. 104-8537
Mfr. Part No.BLM21AG102SH1D
BrandMurata
$0.167
Each (In a Pack of 50)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Automotive, Powertrain, Safety
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. 166-9873
Mfr. Part No.BLM21RK601SN1D
BrandMurata
$0.064
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. 724-1517
Mfr. Part No.BLM21BB750SN1D
BrandMurata
$0.124
Each (In a Pack of 25)
units
0805 (2012M) - 75Ω - - - 700mA 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. 166-9871
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. 724-1536
Mfr. Part No.BLM21PG300SN1D
BrandMurata
$0.108
Each (In a Pack of 25)
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. 144-9868
Mfr. Part No.742792150
$0.248
Each (On a Reel of 3000)
units
1206 - 80Ω - - - 4A EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 166-9732
Mfr. Part No.BLM21BB750SN1D
BrandMurata
$0.055
Each (On a Reel of 4000)
units
0805 (2012M) - 75Ω - - - 700mA 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. 724-1582
Mfr. Part No.BLM31PG601SN1L
BrandMurata
$0.284
Each (In a Pack of 25)
units
1206 (3216M) - 600Ω - - - 1.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
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