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. 144-9785
Mfr. Part No.742792651
HK$1.15
Each (On a Reel of 4000)
units
603 - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 124-1835
Mfr. Part No.742792651
HK$1.44
Each (In a Pack of 50)
units
0603 (1608M) - 600Ω - - - 1A Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - 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. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
HK$0.441
Each (In a Pack of 25)
units
0603 (1608M) - 470Ω - - - 1A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, Power Supplies
RS Stock No. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
HK$0.185
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
RS Stock No. 166-9560
Mfr. Part No.BLM15HG102SN1D
BrandMurata
HK$0.434
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 General Use
RS Stock No. 124-1839
Mfr. Part No.742792040
HK$1.854
Each (In a Pack of 50)
units
0805 (2012M) - 600Ω - - - 2A 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. 163-4003
Mfr. Part No.74279226101
HK$4.542
Each (On a Reel of 2500)
units
1812 (4532M) - 100Ω - - - 8A Bead 4.5 x 3.2 x 2.3mm 4.5mm 3.2mm 2.3mm - EMI Suppression, High Current
RS Stock No. 724-1447
Mfr. Part No.BLM18SG121TN1D
BrandMurata
HK$0.642
Each (In a Pack of 25)
units
0603 (1608M) - 120Ω - - - 3mA Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 741-3129
Mfr. Part No.MMZ1608R102AT
BrandTDK
HK$0.377
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. 144-9788
Mfr. Part No.742792040
HK$1.134
Each (On a Reel of 4000)
units
805 - 600Ω - - - 2A 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. 749-8328
Mfr. Part No.74279226101
HK$5.644
Each (In a Bag of 5)
units
1812 (4532M) - 100Ω - - - 8A Bead 4.5 x 3.2 x 2.3mm 4.5mm 3.2mm 2.3mm - EMI Suppression, High Current
RS Stock No. 125-3151
Mfr. Part No.BLM18SG121TN1D
BrandMurata
HK$0.265
Each (On a Reel of 10000)
units
0603 (1608M) - 120Ω - - - 3mA Chip Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 724-1286
Mfr. Part No.BLM15HG102SN1D
BrandMurata
HK$0.907
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 General Use
RS Stock No. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
HK$0.406
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 741-3194
Mfr. Part No.MPZ1608S221AT
BrandTDK
HK$0.317
Each (In a Bag of 100)
units
0603 (1608M) - - - - - - - 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - -
RS Stock No. 792-6249
Mfr. Part No.BLM18EG121SN1D
BrandMurata
HK$1.092
Each (In a Bag of 25)
units
0603 (1608M) - 120Ω - - - 2A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)
RS Stock No. 167-4832
Mfr. Part No.BLM15AX601SN1D
BrandMurata
HK$0.184
Each (On a Reel of 10000)
units
0402 (1005M) - 600Ω - - - 500mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 104-8517
Mfr. Part No.BLM03BD601SN1D
BrandMurata
HK$0.458
Each (In a Pack of 200)
units
0603 (1608M) - 600Ω - - - 200mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - EMI Suppression Filter, General Use
RS Stock No. 839-0819
Mfr. Part No.BLM18KG300TN1D
BrandMurata
HK$0.308
Each (In a Bag of 100)
units
0603 (1608M) - 30Ω - - - 5A Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 125-3145
Mfr. Part No.BLA31AG102SN4D
BrandMurata
HK$1.617
Each (On a Reel of 4000)
units
1206 (3216M) - 1000Ω - - - 50mA Chip Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - EMI Suppression, General Electronics
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