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. 811-9610
Mfr. Part No.BLM15BB470SN1D
BrandMurata
TWD1.90
Each (In a Bag of 50)
units
0402 (1005M) - 47Ω - - - 300mA 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. 870-9342
Mfr. Part No.Z0603C241ESMST
BrandKEMET
TWD1.30
Each (In a Pack of 4000)
units
0603 (1608M) - 240Ω - - - 600mA Multilayer Chip Bead 40.64 x 20.32 x 20.32mm 40.64mm 20.32mm 20.32mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS Stock No. 164-5866
Mfr. Part No.5-1624116-6
TWD3.70
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS Stock No. 172-9960
Mfr. Part No.2743021447
BrandFair-Rite
TWD5.20
Each (On a Reel of 2800)
units
SMD 56Ω 95Ω - - - - Bead 9.6 x 3.05 x 2.85mm 9.6mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 144-9749
Mfr. Part No.7427927140
TWD5.00
Each (On a Reel of 10000)
units
0402 (1005M) - 47Ω - - - 200mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Data Line Filter, Uncoupling of Distribution Voltage
RS Stock No. 144-9796
Mfr. Part No.74279207
TWD5.60
Each (On a Reel of 4000)
units
805 - 100Ω - - - 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. 870-9323
Mfr. Part No.Z0402C601ESMST
BrandKEMET
TWD1.00
Each (In a Pack of 10000)
units
0402 (1005M) - 600Ω - - - 300mA Multilayer Chip Bead 25.4 x 12.7 x 12.7mm 25.4mm 12.7mm 12.7mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS Stock No. 888-3077
Mfr. Part No.HI2220P601R-10
TWD19.20
Each (In a Pack of 50)
units
2220 (5650M) 220Ω 600Ω - - 106Ω 4A Chip Bead 5.59 x 5.08 x 3.05mm 5.59mm 5.08mm 3.05mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 888-3229
Mfr. Part No.LI1812D121R-10
TWD7.40
Each (In a Pack of 100)
units
1812 (4532M) 55Ω 120Ω - - 184Ω 400mA Chip Bead 4.5 x 3.2 x 1.4mm 4.5mm 3.2mm 1.4mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS Stock No. 122-5315
Mfr. Part No.BLM15PX601SN1D
BrandMurata
TWD1.20
Each (On a Reel of 10000)
units
0402 (1005M) - 600Ω - - - 900mA Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - General Electronics
RS Stock No. 318-2795
Mfr. Part No.BL01RN1A1D2B
BrandMurata
TWD6.00
Each (In a Pack of 25)
units
Radial - 220Ω - - - 7A Bead 3.6 (Dia.) x 5mm 5mm - - 3.6mm General Electronics
RS Stock No. 163-3555
Mfr. Part No.742792622
TWD4.40
Each (On a Reel of 4000)
units
0603 (1608M) - 180Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 146-0685
Mfr. Part No.74279224251
TWD37.40
Each (In a Pack of 10)
units
2220 (5650M) - 250Ω - - - 4A Ferrite Bead 5.6 x 5.1 x 1.8mm 5.6mm 5.1mm 1.8mm - Broadband Suppression, EMI Suppression of DC/DC Converters & DC Power Supply, Filter with High Inrush Current Peaks, Motor Interference Suppression
RS Stock No. 669-3982
Mfr. Part No.74279268
TWD5.70
Each (In a Pack of 10)
units
0603 (1608M) - 100Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 786-5034
Mfr. Part No.MMZ1608S601AT
BrandTDK
TWD5.00
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. 863-7344
Mfr. Part No.5-1624117-9
TWD3.20
Each (In a Bag of 100)
units
0805 (2012M) - 20Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Current, Noise Filtering
RS Stock No. 164-5867
Mfr. Part No.5-1624116-7
TWD3.70
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS Stock No. 144-9866
Mfr. Part No.742792118
TWD5.20
Each (On a Reel of 3000)
units
1206 - 600Ω - - - 2.5A EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 888-3443
Mfr. Part No.28B0485-000
TWD12.90
Each (In a Pack of 100)
units
0485 170Ω 320Ω 450Ω - - - Cylindrical EMI Core 12.32 x 25.4mm 25.4mm - - 12.32mm EMI Suppression
RS Stock No. 164-5861
Mfr. Part No.5-1624116-1
TWD3.50
Each (On a Reel of 4000)
units
0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering