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. 863-7297
Mfr. Part No.1-1879855-6
$0.176
Each (In a Bag of 100)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 467-3797
Mfr. Part No.2944666631
BrandFair-Rite
$0.565
Each (In a Pack of 10)
units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS Stock No. 109-4151
Mfr. Part No.MPZ1608S221AT
BrandTDK
$0.053
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - - 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - -
RS Stock No. 164-5845
Mfr. Part No.4-1624117-9
$0.156
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - -
RS Stock No. 125-3151
Mfr. Part No.BLM18SG121TN1D
BrandMurata
$0.052
Each (On a Reel of 10000)
units
0603 (1608M) - 120Ω - - - 3mA Chip Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 863-0870
Mfr. Part No.74279221601
$0.766
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. 792-6211
Mfr. Part No.BLM15HB121SN1D
BrandMurata
$0.179
Each (In a Bag of 25)
units
0402 (1005M) - 120Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band High-speed Signal Lines
RS Stock No. 811-9626
Mfr. Part No.BLM18RK221SN1D
BrandMurata
$0.106
Each (In a Bag of 25)
units
0603 (1608M) - 220Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Digital Interface, EMI Suppression Filter
RS Stock No. 166-9852
Mfr. Part No.BLM18HD471SN1D
BrandMurata
$0.077
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 100mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band High-Speed Signal Line
RS Stock No. 724-1286
Mfr. Part No.BLM15HG102SN1D
BrandMurata
$0.181
Each (In a Pack of 25)
units
0402 (1005M) - 1000Ω - - - 250mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 166-9855
Mfr. Part No.BLM18HG601SN1D
BrandMurata
$0.077
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - - 200mA 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. 787-9951
Mfr. Part No.742792095
$0.348
Each (In a Bag of 10)
units
0805 (2012M) - 2700Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 122-5320
Mfr. Part No.BLM18HB121SN1D
BrandMurata
$0.066
Each (On a Reel of 4000)
units
0603 (1608M) - 120Ω - - - 200mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - General Electronics
RS Stock No. 167-4958
Mfr. Part No.BLM15BD182SN1D
BrandMurata
$0.044
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. 669-4115
Mfr. Part No.74279212
$0.535
Each (In a Pack of 10)
units
1206 (3216M) - 150Ω - - - 300mA EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 467-3292
Mfr. Part No.2743001112
BrandFair-Rite
$0.138
Each (In a Pack of 50)
units
Axial 61Ω - - - - - Bead 3.5 (Dia.) x 4.45mm 4.45mm - - 3.5mm EMI Suppression
RS Stock No. 467-3450
Mfr. Part No.2761008112
BrandFair-Rite
$0.162
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. 144-9857
Mfr. Part No.7427521
$3.093
Each (On a Reel of 2400)
units
- - 52Ω - - - 5A Bead 8.9 x 5.6 x 2.5mm 8.9mm 5.6mm 2.5mm - Common Mode Interference, General Electronics, Power Supply, Symmetric Data Lines
RS Stock No. 724-1576
Mfr. Part No.BLM31PG330SN1L
BrandMurata
$0.30
Each (In a Pack of 25)
units
1206 (3216M) - 33Ω - - - 6A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 863-7275
Mfr. Part No.5-1624117-2
$0.197
Each (In a Bag of 100)
units
0805 (2012M) - 200Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - General Purpose, High frequency
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