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. 144-9786
Mfr. Part No.742792096
R 2,714.67
Each (On a Reel of 4000)
units
805 - 1000Ω - - - 1A 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. 124-1865
Mfr. Part No.74279206
R 3.116
Each (In a Pack of 50)
units
0805 (2012M) - 30Ω - - 55Ω 3A 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. 163-3221
Mfr. Part No.74279209
R 3,086.37
Each (On a Reel of 4000)
units
0805 (2012M) - 1200Ω - - - 200mA - 2 x 1.2 x 0.9mm 2mm 1.24mm 0.9mm - General Electronics
RS stock no. 202-3667
Mfr. Part No.BLM21BD222SN1L
BrandMurata
R 1.206
Each (In a Pack of 20)
units
0805 (2012M) - - - - - - Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 888-3490
Mfr. Part No.28B2000-100
R 123.22
Each
units
2000 157Ω 305Ω 442Ω - - - Cylindrical EMI Core 50.8 x 28.7mm 28.7mm - - 50.8mm EMI Suppression
RS stock no. 888-3257
Mfr. Part No.MI0805K400R-10
R 0.901
Each (In a Pack of 500)
units
0805 (2012M) 19Ω 40Ω - - 63Ω 1.5A Chip Bead 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS stock no. 724-1605
Mfr. Part No.BL01RN1A1D2B
BrandMurata
R 1.754
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 888-3462
Mfr. Part No.28B0625-100
R 7.09
Each (In a Pack of 50)
units
0625 150Ω 280Ω 400Ω - - - Cylindrical EMI Core 15.88 x 28.58mm 28.58mm - - 15.88mm EMI Suppression
RS stock no. 786-5037
Mfr. Part No.MMZ1608Y152BT
BrandTDK
R 0.385
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. 124-1837
Mfr. Part No.742792096
R 0.735
Each (In a Pack of 50)
units
0805 (2012M) - 1000Ω - - - 1A 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. 669-4099
Mfr. Part No.742792022
R 3.73
Each (In a Pack of 10)
units
0805 (2012M) - 220Ω - - - 2A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
R 1.157
Each (On a Reel of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 167-5789
Mfr. Part No.BLM18KG471SN1D
BrandMurata
R 1,296.96
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1.5A 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. 144-9844
Mfr. Part No.742792021
R 2.433
Each (On a Reel of 4000)
units
0805 - 22Ω - - - 6A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 669-4092
Mfr. Part No.742792031
R 3.73
Each (In a Pack of 10)
units
0805 (2012M) - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 144-9845
Mfr. Part No.742792031
R 2.433
Each (On a Reel of 4000)
units
0805 - 300Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Suppression Components
RS stock no. 144-9788
Mfr. Part No.742792040
R 2.896
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. 144-9795
Mfr. Part No.74279267
R 2,560.03
Each (On a Reel of 4000)
units
603 - 60Ω - - - 500mA 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. 163-4593
Mfr. Part No.742863147
R 8,551.26
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Highspeed Bus Systems, Suppression Components
RS stock no. 125-3149
Mfr. Part No.BLM18PG221SN1D
BrandMurata
R 1,329.77
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - - 1.4A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies