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. 724-1570
Mfr. Part No.BLM31PG391SN1L
BrandMurata
TWD7.10
Each (In a Pack of 25)
units
1206 (3216M) - 390Ω - - - 2A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 167-5789
Mfr. Part No.BLM18KG471SN1D
BrandMurata
TWD0.70
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1.5A 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. 747-4726
Mfr. Part No.BLM18KG471SN1D
BrandMurata
TWD1.60
Each (In a Bag of 100)
units
0603 (1608M) - 470Ω - - - 1.5A 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. 795-7919
Mfr. Part No.CIM10U102NC
TWD0.40
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 400mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 669-4077
Mfr. Part No.742792043
TWD7.00
Each (In a Pack of 10)
units
0805 (2012M) - 600Ω - - - 200mA EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 166-9850
Mfr. Part No.BLM18GG471SN1D
BrandMurata
TWD2.60
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High-GHz Band General Use
RS Stock No. 724-1346
Mfr. Part No.BLM18HD102SN1D
BrandMurata
TWD3.80
Each (In a Pack of 25)
units
0603 (1608M) - 1000Ω - - - 50mA 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. 167-4820
Mfr. Part No.BLM18TG102TN1D
BrandMurata
TWD0.50
Each (On a Reel of 10000)
units
0603 (1608M) - 600Ω - - - 100mA Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, General Use
RS Stock No. 167-4993
Mfr. Part No.BLM21PG331SH1D
BrandMurata
TWD1.40
Each (On a Reel of 4000)
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. 260-6874
Mfr. Part No.74279204
TWD7.00
Each (In a Pack of 10)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS Stock No. 812-0789
Mfr. Part No.BMB2A1000BN3
TWD6.10
Each (In a Bag of 100)
units
0805 (2012M) - 1000Ω - - - - Chip Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Frequency
RS Stock No. 163-3554
Mfr. Part No.742792609
TWD3.50
Each (On a Reel of 4000)
units
0603 (1608M) - 30Ω - - - 3A EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 467-3494
Mfr. Part No.2773019447
BrandFair-Rite
TWD4.90
Each (In a Pack of 25)
units
SMD 40Ω - - - - - Bead 5.1 x 3.05 x 2.85mm 5.1mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 888-3531
Mfr. Part No.35F0121-1SR-10
TWD10.60
Each (In a Pack of 100)
units
3812 (9630M) - 82Ω - - 90Ω 10A Bead 3.05 x 2.54 x 8.51mm 3.05mm 2.54mm 8.51mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 104-8535
Mfr. Part No.BLM18PG471SH1D
BrandMurata
TWD1.50
Each (In a Pack of 200)
units
0603 (1608M) - 470Ω - - - 1A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety
RS Stock No. 144-9845
Mfr. Part No.742792031
TWD5.90
Each (On a Reel of 4000)
units
0805 - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 724-1242
Mfr. Part No.BLA31AG102SN4D
BrandMurata
TWD22.00
Each
units
1206 (3216M) - 1000Ω - - - 50mA Chip Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 669-4092
Mfr. Part No.742792031
TWD7.50
Each (In a Pack of 10)
units
0805 (2012M) - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS Stock No. 239-589
Mfr. Part No.BL01RN1A1F1J
BrandMurata
TWD3.50
Each (In a Pack of 10)
units
Axial - - - - - 7A Bead 3.6 (Dia.) x 5mm 5mm - - 3.6mm General Electronics
RS Stock No. 172-9965
Mfr. Part No.2773019447
BrandFair-Rite
TWD7.00
Each (On a Reel of 2800)
units
SMD 40Ω - - - - - Bead 5.1 x 3.05 x 2.85mm 5.1mm 3.05mm 2.85mm - EMI Suppression