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. 162-1665
Mfr. Part No.BMB2A0120AN4
$0.042
Each (On a Reel of 4000)
units
0805 (2012M) - 120Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - EMI Filtering, General Electronics
RS Stock No. 812-0777
Mfr. Part No.BMB2A0120AN4
$0.042
Each (In a Bag of 100)
units
0805 (2012M) - 120Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - EMI Filtering, General Electronics
RS Stock No. 161-6309
Mfr. Part No.BMB2A0060LN2
$0.07
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 164-5798
Mfr. Part No.3-1624116-7
$0.082
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 - -
RS Stock No. 863-7152
Mfr. Part No.3-1624116-7
$0.091
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 - General Purpose, High frequency
RS Stock No. 812-0764
Mfr. Part No.BMB2A0060LN2
$0.139
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS Stock No. 863-7304
Mfr. Part No.4-1624116-7
$0.091
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
RS Stock No. 164-5875
Mfr. Part No.5-1624117-5
$0.128
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. 164-5803
Mfr. Part No.3-1624117-3
$0.05
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. 164-5804
Mfr. Part No.3-1624117-4
$0.068
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. 164-5905
Mfr. Part No.6-1624117-6
$0.142
Each (On a Reel of 4000)
units
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - High Current, Noise Filtering
RS Stock No. 863-7326
Mfr. Part No.5-1624116-3
$0.091
Each (In a Bag of 100)
units
0603 (1608M) - 220Ω - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS Stock No. 164-5867
Mfr. Part No.5-1624116-7
$0.111
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. 863-7120
Mfr. Part No.2-1624116-7
$0.091
Each (In a Bag of 100)
units
0603 (1608M) - 60Ω - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - General Purpose, High frequency
RS Stock No. 164-5876
Mfr. Part No.5-1624117-6
$0.172
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. 863-7307
Mfr. Part No.1-1879855-7
$0.071
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. 164-5635
Mfr. Part No.1-1879855-6
$0.087
Each (On a Reel of 10000)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 863-7278
Mfr. Part No.5-1624117-0
$0.135
Each (In a Bag of 100)
units
0805 (2012M) - 100Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - General Purpose, High frequency
RS Stock No. 164-5637
Mfr. Part No.1-1879855-8
$0.087
Each (On a Reel of 10000)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - High Current, Noise Filtering
RS Stock No. 863-7219
Mfr. Part No.1-1879855-0
$0.071
Each (In a Bag of 100)
units
0402 (1005M) - - - - - - Ferrite Bead 1 x 0.5 x 0.32mm 1mm 0.5mm 0.32mm - General Purpose, High frequency