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. 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. 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. 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. 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. 172-9975
Mfr. Part No.2944666631
BrandFair-Rite
HK$2.597
Each (In a Box of 200)
units
Radial - 690Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression
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. 172-9960
Mfr. Part No.2743021447
BrandFair-Rite
HK$0.832
Each (On a Reel of 2800)
units
SMD 56Ω 95Ω - - - - Bead 9.6 x 3.05 x 2.85mm 9.6mm 3.05mm 2.85mm - EMI Suppression
RS Stock No. 749-8299
Mfr. Part No.74279224101
HK$10.288
Each (In a Bag of 5)
units
2220 (5650M) - 100Ω - - 160Ω 7A Bead 5.59 x 5.08 x 1.8mm 5.59mm 5.08mm 1.8mm - EMI Suppression, High Current
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. 724-1356
Mfr. Part No.BLM18HD601SN1D
BrandMurata
HK$0.916
Each (In a Pack of 25)
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. 811-9770
Mfr. Part No.BLM18BB100SN1D
BrandMurata
HK$0.468
Each (In a Bag of 25)
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. 724-1242
Mfr. Part No.BLA31AG102SN4D
BrandMurata
HK$5.34
Each
units
1206 (3216M) - 1000Ω - - - 50mA Chip Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 125-3145
Mfr. Part No.BLA31AG102SN4D
BrandMurata
HK$1.649
Each (On a Reel of 4000)
units
1206 (3216M) - 1000Ω - - - 50mA Chip Bead 3.2 x 1.6 x 0.8mm 3.2mm 1.6mm 0.8mm - EMI Suppression, General Electronics
RS Stock No. 104-8533
Mfr. Part No.BLM18PG330SH1D
BrandMurata
HK$0.388
Each (In a Pack of 200)
units
0603 (1608M) - 33Ω - - - 3A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety
RS Stock No. 839-0819
Mfr. Part No.BLM18KG300TN1D
BrandMurata
HK$0.314
Each (In a Bag of 100)
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. 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. 167-4201
Mfr. Part No.BLM18EG121SN1D
BrandMurata
HK$0.548
Each (On a Reel of 4000)
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. 166-9821
Mfr. Part No.BLM41PG471SN1L
BrandMurata
HK$0.935
Each (On a Reel of 2500)
units
1806 (4516M) - 470Ω - - - 2A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - EMI Suppression, Power Supplies