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


DVD’s


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. 795-7657
Mfr. Part No.CIC10P471NC
SGD0.02
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1.2A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current
RS Stock No. 795-7631
Mfr. Part No.CIB32P600NE
SGD0.158
Each (On a Reel of 2500)
units
1210 (3225M) - 60Ω - - - 1.5A Chip Bead 3.2 x 2.5 x 1.3mm 3.2mm 2.5mm 1.3mm - EMI Suppression
RS Stock No. 795-7896
Mfr. Part No.CIM10J471NC
SGD0.022
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 300mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 172-8768
Mfr. Part No.CIM10U800NC
SGD0.017
Each (On a Reel of 10000)
units
0603 (1608M) - 80Ω - - - 600mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 795-7681
Mfr. Part No.CIC31P601NE
SGD0.158
Each (On a Reel of 3000)
units
1206 (3216M) - 600Ω - - - 1.5A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - High Current
RS Stock No. 172-8755
Mfr. Part No.CIM10J800NC
SGD0.022
Each (On a Reel of 10000)
units
0603 (1608M) - 80Ω - - - 550mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 172-8756
Mfr. Part No.CIM10J471NC
SGD0.15
Each (On a Reel of 10000)
units
0603 (1608M) - 470Ω - - - 300mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 795-7893
Mfr. Part No.CIM10J800NC
SGD0.024
Each (On a Reel of 4000)
units
0603 (1608M) - 80Ω - - - 550mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 795-7950
Mfr. Part No.CIV05J102NC
SGD0.158
Each (On a Reel of 10000)
units
0402 (1005M) - 1000Ω - - - 250mA Chip Bead 1.0 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Noise Suppression
RS Stock No. 795-7931
Mfr. Part No.CIM10U800NC
SGD0.01
Each (On a Reel of 4000)
units
0603 (1608M) - 80Ω - - - 600mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression
RS Stock No. 795-7644
Mfr. Part No.CIC10J600NC
SGD0.019
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 2A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current