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. 467-3810
Mfr. Part No.2944666651
BrandFair-Rite
R 4.915
Each (In a Pack of 10)
units
Radial - 600Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS stock no. 724-1368
Mfr. Part No.BLM18HG102SN1D
BrandMurata
R 1.396
Each (In a Pack of 25)
units
0603 (1608M) - 1000Ω - - - 100mA 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. 172-9972
Mfr. Part No.2944666651
BrandFair-Rite
R 3.991
Each (In a Box of 200)
units
Radial - 600Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
RS stock no. 144-9802
Mfr. Part No.742792042
R 1.84
Each (On a Reel of 4000)
units
805 - 600Ω - - - 200mA 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. 124-1866
Mfr. Part No.742792042
R 3.234
Each (In a Pack of 50)
units
0805 (2012M) - 600Ω - - - 200mA 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. 724-1508
Mfr. Part No.BLM21BB600SN1D
BrandMurata
R 1.811
Each (In a Pack of 25)
units
0805 (2012M) - 60Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 888-3395
Mfr. Part No.28A3851-0A2
R 73.367
Each (In a Pack of 10)
units
3851 150Ω 260Ω 410Ω - - - Snap-On EMI Core, Split EMI Core 30 x 33.7 x 30mm 30mm 33.7mm 30mm - EMI Suppression
RS stock no. 888-3345
Mfr. Part No.28A1507-0A2
R 6.689
Each (In a Pack of 50)
units
1507 56Ω 123Ω 246Ω - - - Snap-On EMI Core, Split EMI Core 150 x 180mm 180mm - - 150mm EMI Suppression
RS stock no. 166-9854
Mfr. Part No.BLM18HG102SN1D
BrandMurata
R 0.439
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 100mA 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. 166-9867
Mfr. Part No.BLM21BB600SN1D
BrandMurata
R 0.559
Each (On a Reel of 4000)
units
0805 (2012M) - 60Ω - - - 800mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 724-1277
Mfr. Part No.BLM15HD102SN1D
BrandMurata
R 1.052
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 High-speed Signal Lines
RS stock no. 166-9709
Mfr. Part No.BLM21BD222SN1L
BrandMurata
R 2,307.35
Each (On a Reel of 3000)
units
0805 (2012M) - - - - - - Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 163-3221
Mfr. Part No.74279209
R 2.137
Each (On a Reel of 4000)
units
0805 (2012M) - 1200Ω - - - 200mA - 2 x 1.2 x 0.9mm 2mm 1.24mm 0.9mm - General Electronics
RS stock no. 166-9559
Mfr. Part No.BLM15HD102SN1D
BrandMurata
R 0.303
Each (On a Reel of 10000)
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 High-speed Signal Lines
RS stock no. 124-1520
Mfr. Part No.74275013
R 5.039
Each (In a Pack of 20)
units
Axial 750Ω 950Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm - - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS stock no. 327-5538
Mfr. Part No.74279209
R 2.51
Each (In a Pack of 10)
units
0805 (2012M) - 1200Ω - - - 200mA - 2 x 1.2 x 0.9mm 2mm 1.24mm 0.9mm - General Electronics
RS stock no. 144-9801
Mfr. Part No.74279206
R 1.931
Each (On a Reel of 4000)
units
805 - 30Ω - - 55Ω 3A 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. 144-9786
Mfr. Part No.742792096
R 1.063
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. 786-5037
Mfr. Part No.MMZ1608Y152BT
BrandTDK
R 0.385
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. 202-3667
Mfr. Part No.BLM21BD222SN1L
BrandMurata
R 1.218
Each (In a Pack of 20)
units
0805 (2012M) - - - - - - Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines