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 Prix 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
N° de stock RS 166-9857
Référence fabricantBLM18PG331SN1D
MarqueMurata
0,013 €
Each (On a Reel of 4000)
Unité
0603 (1608M) - 330Ω - - - 1.2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
N° de stock RS 724-1413
Référence fabricantBLM18PG331SN1D
MarqueMurata
0,038 €
Each (In a Pack of 25)
Unité
0603 (1608M) - 330Ω - - - 1.2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
N° de stock RS 747-4723
Référence fabricantBLM18KG260TN1D
MarqueMurata
0,03 €
Each (In a Bag of 100)
Unité
0603 (1608M) - 26Ω - - - 6A Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, GHz Band Digital Interface
N° de stock RS 792-6274
Référence fabricantBLM18PG121SH1D
MarqueMurata
0,055 €
Each (In a Bag of 25)
Unité
0603 (1608M) - 120Ω - - - 2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
N° de stock RS 167-4983
Référence fabricantBLM18PG121SH1D
MarqueMurata
0,023 €
Each (On a Reel of 4000)
Unité
0603 (1608M) - 120Ω - - - 2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
N° de stock RS 669-4099
Référence fabricant742792022
0,19 €
Each (In a Pack of 10)
Unité
0805 (2012M) - 220Ω - - - 2A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
N° de stock RS 188-8643
Référence fabricantBLM41PF800SN1L
MarqueMurata
0,336 €
Each (In a Pack of 10)
Unité
1806 (4516M) - - - - - - Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - General Electronics
N° de stock RS 125-3118
Référence fabricantBLM41PF800SN1L
MarqueMurata
0,126 €
Each (On a Reel of 2500)
Unité
1806 (4516M) - - - - - - Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - General Electronics
N° de stock RS 724-1380
Référence fabricantBLM18PG121SN1D
MarqueMurata
0,044 €
Each (In a Pack of 25)
Unité
0603 (1608M) - 120Ω - - - 2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
N° de stock RS 177-6254
Référence fabricantBLM41PG750SN1L
MarqueMurata
0,101 €
Each (On a Reel of 4000)
Unité
1806 - 75Ω - - - 3.5A Filter 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - EMI Suppression, Power Line
N° de stock RS 125-3119
Référence fabricantBLM41PG750SN1L
MarqueMurata
0,101 €
Each (On a Reel of 2500)
Unité
1806 (4516M) - 75Ω - - - 3.5A Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
N° de stock RS 188-8659
Référence fabricantBLM41PG750SN1L
MarqueMurata
0,26 €
Each (In a Pack of 10)
Unité
1806 (4516M) - 75Ω - - - 3.5A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
N° de stock RS 167-4832
Référence fabricantBLM15AX601SN1D
MarqueMurata
0,009 €
Each (On a Reel of 10000)
Unité
0402 (1005M) - 600Ω - - - 500mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
N° de stock RS 839-0786
Référence fabricantBLM15AX601SN1D
MarqueMurata
0,022 €
Each (In a Bag of 100)
Unité
0402 (1005M) - 600Ω - - - 500mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
N° de stock RS 167-4905
Référence fabricantBLM15BB100SN1D
MarqueMurata
0,019 €
Each (On a Reel of 10000)
Unité
0402 (1005M) - 10Ω - - - 300mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - High Speed Signal Lines
N° de stock RS 167-3811
Référence fabricantBLM15EG121SN1D
MarqueMurata
0,022 €
Each (On a Reel of 10000)
Unité
0402 (1005M) - 120Ω - - - 1.5A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
N° de stock RS 787-9998
Référence fabricant742792620
0,148 €
Each (In a Bag of 10)
Unité
0603 (1608M) - 100Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
N° de stock RS 871-2067
Référence fabricantBLM15BB100SN1D
MarqueMurata
0,032 €
Each (In a Bag of 250)
Unité
0402 (1005M) - 10Ω - - - 300mA Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - High Speed Signal Lines
N° de stock RS 172-9976
Référence fabricant2961666671
MarqueFair-Rite
0,256 €
Each (In a Box of 200)
Unité
Axial - 780Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
N° de stock RS 110-188
Référence fabricantBLM15EG121SN1D
MarqueMurata
0,012 €
Each (In a Bag of 25)
Unité
0402 (1005M) - 120Ω - - - 1.5A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)