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. 467-3365
Mfr. Part No.2743021447
BrandFair-Rite
HK$0.988
Each (In a Pack of 25)
units
SMD 56Ω 95Ω - - - - Bead 9.6 x 3.05 x 2.85mm 9.6mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 166-9836
Mfr. Part No.BLM15BD471SN1D
BrandMurata
HK$0.18
Each (On a Reel of 10000)
units
0402 (1005M) - 470Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 166-9851
Mfr. Part No.BLM18HD601SN1D
BrandMurata
HK$0.414
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - 1200Ω 100mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band High-Speed Signal Line
RS Stock No. 170-5853
Mfr. Part No.BLM18BB100SN1D
BrandMurata
HK$0.197
Each (On a Reel of 4000)
units
0603 (1608M) - 10Ω - - - 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 161-8060
Mfr. Part No.BLM21PG221SH1D
BrandMurata
HK$0.369
Each (On a Reel of 4000)
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. 110-071
Mfr. Part No.BLM15BD471SN1D
BrandMurata
HK$0.486
Each (In a Bag of 25)
units
0402 (1005M) - 470Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 144-9856
Mfr. Part No.7427512
HK$10.733
Each (On a Reel of 1000)
units
- 425Ω 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
HK$0.18
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 400mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 792-6249
Mfr. Part No.BLM18EG121SN1D
BrandMurata
HK$1.113
Each (In a Bag of 25)
units
0603 (1608M) - 120Ω - - 145Ω 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. 736-2125
Mfr. Part No.7427512
HK$12.753
Each (In a Bag of 10)
units
SMD 425Ω 580Ω - - - 5A Bead 11 x 4.65 x 5mm 11mm 4.65mm 5mm - EMI Suppression, RFI Suppression
RS Stock No. 124-1859
Mfr. Part No.74279267
HK$1.512
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. 724-1627
Mfr. Part No.BL03RN2R1M1B
BrandMurata
HK$2.311
Each (In a Pack of 25)
units
Radial - - - - - 6A EMI Suppression 8.3 x 2.3 x 6.5mm 8.3mm 2.3mm 6.5mm - -
RS Stock No. 888-3462
Mfr. Part No.28B0625-100
HK$6.432
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. 166-9690
Mfr. Part No.BL03RN2R1M1B
BrandMurata
HK$0.961
Each (In a Bag of 1000)
units
Radial - - - - - 6A EMI Suppression 8.3 x 2.3 x 6.5mm 8.3mm 2.3mm 6.5mm - -
RS Stock No. 792-6312
Mfr. Part No.BLM21PG221SH1D
BrandMurata
HK$0.808
Each (In a Bag 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. 124-1521
Mfr. Part No.74275043
HK$6.306
Each (In a Pack of 20)
units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Protection Against Radio Frequency Interferences of Components on PCB's of PC's, Text Processing and Other Digital Devices
RS Stock No. 167-4832
Mfr. Part No.BLM15AX601SN1D
BrandMurata
HK$0.197
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. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
HK$0.576
Each (In a Pack of 20)
units
0603 (1608M) - 1000Ω - - - 400mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, General Use
RS Stock No. 358-6563
Mfr. Part No.74275022
HK$13.44
Each
units
Axial 320Ω 512Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - - 6mm Protection Against Radio Frequency Interferences of Components on PCB's of PC's, Text Processing and Other Digital Devices
RS Stock No. 358-6579
Mfr. Part No.742792514
HK$2.664
Each (In a Pack of 10)
units
1812 (4532M) - 600Ω - - - 3A - 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm - General Electronics