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. 181-4459
Mfr. Part No.MH1608-601Y
BrandBourns
$0.035
Each (On a Reel of 1000)
units
1608 - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 181-4464
Mfr. Part No.MH2029-300Y
BrandBourns
$0.041
Each (On a Reel of 1000)
units
2029 - 30Ω - - - 3A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 181-4424
Mfr. Part No.MH3261-601Y
BrandBourns
$0.051
Each (On a Reel of 3000)
units
3261 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 181-4422
Mfr. Part No.MH1608-601Y
BrandBourns
$0.034
Each (On a Reel of 4000)
units
1608 - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 181-4471
Mfr. Part No.MH3261-601Y
BrandBourns
$0.066
Each (On a Reel of 1000)
units
3261 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - IC Power Lines, Power Supply Lines, Signal Lines
RS Stock No. 181-4423
Mfr. Part No.MH2029-300Y
BrandBourns
$0.041
Each (On a Reel of 4000)
units
2029 - 30Ω - - - 3A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - IC Power Lines, Power Supply Lines, Signal Lines