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. 124-8154
Mfr. Part No.BLM18EG601SH1D
BrandMurata
$0.183
Each (In a Pack of 100)
units
0603 (1608M) - 600Ω - - 700Ω 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS Stock No. 169-2760
Mfr. Part No.BLM18EG601SH1D
BrandMurata
$0.121
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - 700Ω 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS Stock No. 166-9860
Mfr. Part No.BLM21AG121SN1D
BrandMurata
$0.058
Each (On a Reel of 4000)
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. 724-1463
Mfr. Part No.BLM21AG121SN1D
BrandMurata
$0.142
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. 604-2022
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.148
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. 166-9873
Mfr. Part No.BLM21RK601SN1D
BrandMurata
$0.071
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. 724-1567
Mfr. Part No.BLM21RK601SN1D
BrandMurata
$0.173
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. 109-4157
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.05
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
RS Stock No. 786-5069
Mfr. Part No.MMZ2012Y152BT
BrandTDK
$0.064
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Signal Line
RS Stock No. 122-5323
Mfr. Part No.BLM18PG331SH1D
BrandMurata
$0.042
Each (On a Reel of 4000)
units
0603 (1608M) - 330Ω - - - 1.2A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety
RS Stock No. 125-3147
Mfr. Part No.BLM18EG221SN1D
BrandMurata
$0.103
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - - 2A Chip 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)
RS Stock No. 144-9786
Mfr. Part No.742792096
$0.285
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
RS Stock No. 663-5520
Mfr. Part No.BLM15BB221SN1D
BrandMurata
$0.063
Each (In a Pack of 100)
units
0402 - 220Ω - - - 200mA 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. 724-1328
Mfr. Part No.BLM18EG221SN1D
BrandMurata
$0.226
Each (In a Pack of 25)
units
0603 (1608M) - 220Ω - - - 2A 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)
RS Stock No. 169-6381
Mfr. Part No.BLM15BB221SN1D
BrandMurata
$0.034
Each (On a Reel of 10000)
units
0402 (1005M) - 220Ω - - - 200mA 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. 792-6202
Mfr. Part No.BLM15BB221SN1D
BrandMurata
$0.108
Each (In a Bag of 25)
units
0402 (1005M) - 220Ω - - - 200mA 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. 124-1837
Mfr. Part No.742792096
$0.332
Each (In a Pack of 50)
units
0805 (2012M) - 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
RS Stock No. 747-4714
Mfr. Part No.BLM18KG221SN1D
BrandMurata
$0.06
Each (In a Bag of 100)
units
0603 (1608M) - 220Ω - - - 2.2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 167-5787
Mfr. Part No.BLM18KG221SN1D
BrandMurata
$0.038
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - - 2.2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
$0.096
Each (In a Pack of 25)
units
0805 (2012M) - 220Ω - - - 2A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
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