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. 144-9785
Mfr. Part No.742792651
HK$0.81
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$1.204
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. 163-4003
Mfr. Part No.74279226101
HK$10,974.50
1 Reel of 2500
Reel(s)
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. 749-8328
Mfr. Part No.74279226101
HK$5.272
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. 124-1839
Mfr. Part No.742792040
HK$1.639
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. 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. 736-2125
Mfr. Part No.7427512
HK$10.733
Each (In a Bag of 10)
units
SMD - 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 144-9795
Mfr. Part No.74279267
HK$4,400.00
1 Reel of 4000
Reel(s)
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. 163-3996
Mfr. Part No.74279224101
HK$14,933.80
1 Reel of 2000
Reel(s)
2220 (5650M) - 100Ω - - - 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
RS Stock No. 124-1859
Mfr. Part No.74279267
HK$1.388
Each (In a Pack of 50)
units
0603 (1608M) - 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. 749-8299
Mfr. Part No.74279224101
HK$9.33
Each (In a Bag of 5)
units
2220 (5650M) - 100Ω - - - 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
RS Stock No. 144-9856
Mfr. Part No.7427512
HK$7,242.00
1 Reel of 1000
Reel(s)
- - 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 124-1521
Mfr. Part No.74275043
HK$5.392
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. 163-4586
Mfr. Part No.742792780
HK$8,098.00
1 Reel of 10000
Reel(s)
0402 (1005M) - 220Ω - - - 300mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 669-3960
Mfr. Part No.74279276
HK$1.455
Each (In a Pack of 10)
units
0402 (1005M) - 60Ω - - - 300mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 144-9765
Mfr. Part No.74279224251
HK$12,469.58
1 Reel of 2000
Reel(s)
2220 (5650M) - 250Ω - - - 4A Ferrite Bead 5.6 x 5.1 x 1.8mm 5.6mm 5.1mm 1.8mm - Broadband Suppression, EMI Suppression of DC/DC Converters & DC Power Supply, Filter with High Inrush Current Peaks, Motor Interference Suppression
RS Stock No. 163-4572
Mfr. Part No.7427927112
HK$8,098.00
1 Reel of 10000
Reel(s)
0402 (1005M) - 120Ω - - - 350mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Suppression Components
RS Stock No. 787-9960
Mfr. Part No.742792110
HK$1.92
Each (In a Bag of 10)
units
1206 (3216M) - 19Ω - - - 3A EMI Suppression 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Suppression Components
RS Stock No. 163-4587
Mfr. Part No.742841160
HK$13,809.00
1 Reel of 10000
Reel(s)
0402 (1005M) - 600Ω - - - 100mA EMI Suppression 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - Highspeed Bus Systems, Suppression Components
RS Stock No. 144-9842
Mfr. Part No.742792602
HK$3,239.20
1 Reel of 4000
Reel(s)
0603 - 60Ω - - - 3A EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components