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. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
$0.07
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 124-1873
Mfr. Part No.742792410
$0.375
Each (In a Pack of 50)
units
1806 (4516M) - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - 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. 144-9808
Mfr. Part No.742792410
$0.277
Each (On a Reel of 2000)
units
1806 - 60Ω - - 120Ω 6A Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - 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. 230-3907
Mfr. Part No.BLM31AF700SN1L
BrandMurata
$0.174
Each (In a Pack of 20)
units
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 724-1510
Mfr. Part No.BLM21BD152SN1D
BrandMurata
$0.159
Each (In a Pack of 25)
units
0805 (2012M) - 1500Ω - - - 250mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 166-9731
Mfr. Part No.BLM21BD152SN1D
BrandMurata
$0.082
Each (On a Reel of 4000)
units
0805 (2012M) - 1500Ω - - - 250mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
$0.087
Each (In a Pack of 25)
units
0805 (2012M) - 220Ω - - - 2A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 125-3152
Mfr. Part No.BLM21AG102SN1D
BrandMurata
$0.062
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, General Electronics
RS Stock No. 124-1521
Mfr. Part No.74275043
$1.501
Each (In a Pack of 20)
units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm General Electronics
RS Stock No. 161-8080
Mfr. Part No.BLM31AF700SN1L
BrandMurata
$249.84
1 Reel of 2500
Reel(s)
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 724-1469
Mfr. Part No.BLM21AG102SN1D
BrandMurata
$0.133
Each (In a Pack of 25)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS Stock No. 736-2119
Mfr. Part No.7427931
$0.945
Each (In a Bag of 10)
units
SMD - 91Ω - - - 6A High Current 8.5 x 3 x 2.55mm 8.5mm 3mm 2.55mm - Voltage Supply
RS Stock No. 163-3567
Mfr. Part No.7427931
$0.787
Each (On a Reel of 500)
units
SMD - 91Ω - - - 6A High Current 8.5 x 3 x 2.55mm 8.5mm 3mm 2.55mm - Voltage Supply
RS Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
$0.076
Each (In a Pack of 25)
units
0402 (1005M) - 120Ω - - - 550mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 604-1754
Mfr. Part No.MMZ1608Y121BT
BrandTDK
$0.112
Each (In a Pack of 10)
units
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line
RS Stock No. 124-1839
Mfr. Part No.742792040
$0.321
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. 161-8059
Mfr. Part No.BLM18HK102SN1D
BrandMurata
$0.07
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 50mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band Digital Interface
RS Stock No. 170-4654
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
$0.786
Each (On a Reel of 1000)
units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
$0.118
Each (On a Reel of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 144-9818
Mfr. Part No.742792514
$0.326
Each (On a Reel of 1000)
units
1812 - 600Ω - - - 3A - 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - General Electronics
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