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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RS Stock No. 839-0825
Mfr. Part No.BLM31PG601SH1L
BrandMurata
PHP9.249
Each (In a Bag of 10)
units
1206 (3216M) - 600Ω - - - 1.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression Filter, Power Supplies
RS Stock No. 167-4806
Mfr. Part No.BLM31PG601SH1L
BrandMurata
PHP5.476
Each (On a Reel of 3000)
units
1206 (3216M) - 600Ω - - - 1.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression Filter, Power Supplies
RS Stock No. 124-1518
Mfr. Part No.7427504
PHP47.109
Each (In a Pack of 20)
units
Axial 702Ω 773Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
PHP3.549
Each (In a Pack 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, Power Supplies
RS Stock No. 724-1605
Mfr. Part No.BL01RN1A1D2B
BrandMurata
PHP8.20
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm 5mm 5mm 3.6mm Power Supplies, Preventing Overshhot And Undershoot Of Digital Signal
RS Stock No. 888-3484
Mfr. Part No.28B1225-000
PHP64.68
Each (In a Pack of 50)
units
1225 68Ω 140Ω 270Ω - - - Cylindrical EMI Core 31.12 x 15.93mm 15.93mm - - 31.12mm EMI Suppression
RS Stock No. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
PHP4.502
Each (On a Reel of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm 5mm 5mm 3.6mm Power Supplies, Preventing Overshhot And Undershoot Of Digital Signal
RS Stock No. 144-9838
Mfr. Part No.74279263
PHP6.899
Each (On a Reel of 4000)
units
0603 - 220Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 167-3807
Mfr. Part No.BLM15AX102SN1D
BrandMurata
PHP1.144
Each (On a Reel of 10000)
units
0402 (1005M) - 1000Ω - - - 350mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 167-4992
Mfr. Part No.BLM18KG300TN1D
BrandMurata
PHP1.137
Each (On a Reel of 4000)
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. 144-9788
Mfr. Part No.742792040
PHP9.62
Each (On a Reel of 4000)
units
0805 - 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. 124-1839
Mfr. Part No.742792040
PHP11.226
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. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
PHP1.239
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS Stock No. 669-4002
Mfr. Part No.74279263
PHP8.864
Each (In a Pack of 10)
units
0603 (1608M) - 220Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS Stock No. 122-5299
Mfr. Part No.BLA31AG221SN4D
BrandMurata
PHP10.448
Each (On a Reel of 4000)
units
1206 (3216M) - 220Ω - - - 150mA Inductor Type 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - General Electronics
RS Stock No. 104-8542
Mfr. Part No.BLM21PG300SH1D
BrandMurata
PHP3.392
Each (In a Pack of 100)
units
0805 (2012M) - 30Ω - - - 4A Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - Automotive, Powertrain, Safety
RS Stock No. 172-9954
Mfr. Part No.2743002112
BrandFair-Rite
PHP6.292
Each (On a Reel of 4500)
units
Axial 88Ω 133Ω - - - - Bead 3.5 (Dia.) x 8.9mm 8.9mm - - 3.5mm EMI Suppression
RS Stock No. 467-3315
Mfr. Part No.2743002112
BrandFair-Rite
PHP6.069
Each (In a Pack of 50)
units
Axial 88Ω 133Ω - - - - Bead 3.5 (Dia.) x 8.9mm 8.9mm - - 3.5mm EMI Suppression
RS Stock No. 124-1519
Mfr. Part No.7427501
PHP22.691
Each (In a Pack of 20)
units
Axial 598Ω 800Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm Digital Devices, PCB, Radio Frequency Interferences, Text Processing
RS Stock No. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
PHP3.549
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