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庫存編號 187-3462
製造零件編號BLM03BD471SN1D
BrandMurata
HK$0.26
個 (在毎卷:15000)
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BrandMurata
HK$0.766
個 (在毎卷:15000)
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0603M - 600Ω - - 1000Ω 150mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - -
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HK$1.733
/個 (每包:10個)
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/個 (每包:10個)
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1806 (4516M) - 150Ω - - - 200mA EMI Suppression 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Suppression Components
RS庫存編號 870-9310
製造零件編號Z0402C241CSMST
BrandKEMET
HK$0.335
/個 (每包:10000個)
單位
0402 (1005M) - 240Ω - - - 250mA Multilayer Chip Bead 25.4 x 12.7 x 12.7mm 25.4mm 12.7mm 12.7mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS庫存編號 187-3464
製造零件編號BLM15PX221SN1D
BrandMurata
HK$0.296
個 (在毎卷:10000)
單位
0402 (1005M) - 220Ω - - - 1.4A Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - General Use
RS庫存編號 110-122
製造零件編號BLM15HD182SN1D
BrandMurata
HK$1.044
個 (以毎袋:25)
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0402 (1005M) - 180Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band High-speed Signal Lines
RS庫存編號 724-1255
製造零件編號BLM15AG121SN1D
BrandMurata
HK$0.482
/個 (每包:25個)
單位
0402 (1005M) - 120Ω - - - 550mA 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 163-3997
製造零件編號74279224151
HK$7.875
個 (在毎卷:2000)
單位
2220 (5650M) - 150Ω - - - 5A Bead 5.59 x 5.08 x 1.52mm 5.59mm 5.08mm 1.52mm - EMI Suppression, High Current
RS庫存編號 888-3210
製造零件編號LI1806C151R-10
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/個 (每包:20000個)
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1806 (4516M) 60Ω 150Ω - - 222Ω 300mA Chip Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Automotive, DSC, Energy and Utilities, General Electronics, Laptop, LCD-TV, Networking Devices, PC, Portable Devices etc., Security
RS庫存編號 863-7338
製造零件編號5-1624116-5
HK$1.033
個 (以毎袋:100)
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0603 (1608M) - - - - - - Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - High Current, Noise Filtering
RS庫存編號 870-9314
製造零件編號Z0402C601ASMST
BrandKEMET
HK$0.243
/個 (每包:10000個)
單位
0402 (1005M) - 600Ω - - - 300mA Multilayer Chip Bead 25.4 x 12.7 x 12.7mm 25.4mm 12.7mm 12.7mm - Digital Product Clock Lines, High Frequency Noise Counter, LSI Power Supplies, Mobile Devices, Noise Suppression, Signal Line
RS庫存編號 187-3465
製造零件編號BLM15PX331SN1D
BrandMurata
HK$0.296
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0402 (1005M) - 330Ω - - - 1.2A Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - General Use
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製造零件編號BLM31PG121SN1L
BrandMurata
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製造零件編號742792011
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