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

DVDs

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庫存編號 467-3371
製造零件編號2743037447
BrandFair-Rite
HK$0.969
/個 (每包:25個)
單位
SMD 56Ω 95Ω - - - - Bead 9.25 x 4.6 x 2.7mm 9.25mm 4.6mm 2.7mm - EMI Suppression
RS庫存編號 167-4831
製造零件編號BLM15AX221SN1D
BrandMurata
HK$0.184
個 (在毎卷:10000)
單位
0402 (1005M) - 220Ω - - - 600mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS庫存編號 888-3399
製造零件編號28A4155-0A2
HK$12.521
/個 (每包:50個)
單位
4155 50Ω 120Ω 230Ω - - - Snap-On EMI Core, Split EMI Core 28.8 x 15.4mm 15.4mm - - 28.8mm EMI Suppression
RS庫存編號 736-2128
製造零件編號7427521
HK$18.61
單位
SMD - 52Ω - - - 5A Bead 8.9 x 5.6 x 2.5mm 8.9mm 5.6mm 2.5mm - Common Mode Interference, General Electronics, Power Supply, Symmetric Data Lines
RS庫存編號 863-7215
製造零件編號4-1624117-6
HK$0.594
個 (以毎袋:100)
單位
0805 (2012M) - 2700Ω - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - General Purpose, High frequency
RS庫存編號 104-8528
製造零件編號BLM18AG221SH1D
BrandMurata
HK$0.351
/個 (每包:200個)
單位
0603 (1608M) - 220Ω - - - 700mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive, Powertrain, Safety
RS庫存編號 863-0858
製造零件編號74279220321
HK$2.53
個 (以毎袋:10)
單位
0805 (2012M) - 320Ω - - - 2.5A Ferrite Bead 2 x 1.2 x 0.9mm 2mm 0.9mm 1.2mm - DC/DC Converter, High Current, Power Supply
RS庫存編號 163-3567
製造零件編號7427931
HK$4.41
個 (在毎卷:500)
單位
SMD - 91Ω - - - 6A High Current 8.5 x 3 x 2.55mm 8.5mm 3mm 2.55mm - Voltage Supply
RS庫存編號 888-3474
製造零件編號28B0686-200
HK$4.665
/個 (每包:50個)
單位
0686 124Ω 242Ω 390Ω - - - Cylindrical EMI Core 17.42 x 28.58mm 28.58mm - - 17.42mm EMI Suppression
RS庫存編號 811-9626
製造零件編號BLM18RK221SN1D
BrandMurata
HK$0.539
個 (以毎袋:25)
單位
0603 (1608M) - 220Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Digital Interface, EMI Suppression Filter
RS庫存編號 870-9339
製造零件編號Z0603C102FSMST
BrandKEMET
HK$0.257
/個 (每包:4000個)
單位
0603 (1608M) - 1000Ω - - - 300mA Multilayer Chip Bead 40.64 x 20.32 x 20.32mm 40.64mm 20.32mm 20.32mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS庫存編號 144-9791
製造零件編號742792662
HK$0.762
個 (在毎卷:4000)
單位
603 - 1000Ω - - - 600mA 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庫存編號 110-548
製造零件編號BLM18BA121SN1D
BrandMurata
HK$0.462
個 (以毎袋:25)
單位
0603 (1608M) - 120Ω - - - 200mA 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庫存編號 839-0796
製造零件編號BLM15PD300SN1D
BrandMurata
HK$0.368
個 (以毎袋:100)
單位
0402 (1005M) - 30Ω - - - 2.2A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS庫存編號 163-3553
製造零件編號742792608
HK$1.127
個 (在毎卷:4000)
單位
0603 (1608M) - 47Ω - - - 500mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS庫存編號 166-9847
製造零件編號BLM18BD102SN1D
BrandMurata
HK$0.188
個 (在毎卷:4000)
單位
0603 (1608M) - 1000Ω - - - 200mA 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庫存編號 167-4946
製造零件編號BLM18BD221SN1D
BrandMurata
HK$0.179
個 (在毎卷:4000)
單位
0603 (1608M) - 220Ω - - - 250mA 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庫存編號 812-0767
製造零件編號BMB2A0300LN2
HK$0.691
個 (以毎袋:100)
單位
0805 (2012M) - - - - - - Ferrite Bead 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm - Signal Line, Telecom
RS庫存編號 124-8154
製造零件編號BLM18EG601SH1D
BrandMurata
HK$0.878
/個 (每包:100個)
單位
0603 (1608M) - 600Ω - - 700Ω 500mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Automotive
RS庫存編號 741-3150
製造零件編號MMZ1608Y102BT
BrandTDK
HK$0.368
個 (以毎袋:100)
單位
0603 (1608M) - - - - - - Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Signal Line