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. 161-8060
Mfr. Part No.BLM21PG221SH1D
BrandMurata
$0.069
Each (On a Reel of 4000)
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
RS Stock No. 604-1962
Mfr. Part No.MMZ2012S400AT
BrandTDK
$0.149
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. 467-3781
Mfr. Part No.2944777741
BrandFair-Rite
$1.03
Each (In a Pack of 5)
units
Axial - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm EMI Suppression
RS Stock No. 125-3119
Mfr. Part No.BLM41PG750SN1L
BrandMurata
$0.191
Each (On a Reel of 2500)
units
1806 (4516M) - 75Ω - - - 3.5A Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS Stock No. 124-1843
Mfr. Part No.742861210
$0.38
Each (In a Pack of 20)
units
0603 (1608M) - 1000Ω - - 1100Ω 50mA Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - CPU, HDD, High Frequency, High Speed Bus Systems
RS Stock No. 167-5787
Mfr. Part No.BLM18KG221SN1D
BrandMurata
$0.037
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. 167-4819
Mfr. Part No.BLM18SG260TN1D
BrandMurata
$0.052
Each (On a Reel of 10000)
units
0603 (1608M) - 26Ω - - - 6A Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - Heavy Maintenace, Metal Surfaces
RS Stock No. 188-8659
Mfr. Part No.BLM41PG750SN1L
BrandMurata
$0.363
Each (In a Pack of 10)
units
1806 (4516M) - 75Ω - - - 3.5A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS Stock No. 358-6844
Mfr. Part No.742792131
$0.439
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. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
$0.08
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 172-9984
Mfr. Part No.2944777741
BrandFair-Rite
$0.981
Each (In a Box of 79)
units
Axial - 500Ω - - - - Bead 10 (Dia.) x 10mm 10.25mm - - 10.25mm EMI Suppression
RS Stock No. 747-4714
Mfr. Part No.BLM18KG221SN1D
BrandMurata
$0.059
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. 144-9784
Mfr. Part No.742792641
$0.226
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. 163-3222
Mfr. Part No.742792131
$0.271
Each (On a Reel of 3000)
units
1206 (3216M) - 600Ω - - - 200mA - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
RS Stock No. 792-6312
Mfr. Part No.BLM21PG221SH1D
BrandMurata
$0.152
Each (In a Bag 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
RS Stock No. 741-3131
Mfr. Part No.MMZ1608R301AT
BrandTDK
$0.056
Each (In a Bag of 100)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line
RS Stock No. 604-2218
Mfr. Part No.MPZ2012S221AT
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. 122-5306
Mfr. Part No.BLM03BD601SN1D
BrandMurata
$0.051
Each (On a Reel of 15000)
units
0603 (1608M) - 600Ω - - - 200mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - EMI Suppression, General Electronics
RS Stock No. 792-6280
Mfr. Part No.BLM18SG260TN1D
BrandMurata
$0.131
Each (In a Bag of 25)
units
0603 (1608M) - 26Ω - - - 6A Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - Heavy Maintenace, Metal Surfaces
RS Stock No. 863-7376
Mfr. Part No.5-1624116-7
$0.202
Each (In a Bag of 100)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
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