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. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
MYR0.219
Each (In a Pack 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. 166-9556
Mfr. Part No.BLM15AG121SN1D
BrandMurata
MYR0.066
Each (On a Reel of 10000)
units
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 Stock No. 724-1255
Mfr. Part No.BLM15AG121SN1D
BrandMurata
MYR0.169
Each (In a Pack of 25)
units
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 Stock No. 724-1429
Mfr. Part No.BLM18PG600SN1D
BrandMurata
MYR0.169
Each (In a Pack of 25)
units
0603 (1608M) - 60Ω - - - 500mA 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. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
MYR0.074
Each (On a Reel of 4000)
units
0603 (1608M) - 60Ω - - - 500mA 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. 724-1270
Mfr. Part No.BLM15BD601SN1D
BrandMurata
MYR0.182
Each (In a Pack of 25)
units
0402 (1005M) - 600Ω - - - 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. 166-9826
Mfr. Part No.BLM31PG121SN1L
BrandMurata
MYR0.357
Each (On a Reel of 3000)
units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 724-1346
Mfr. Part No.BLM18HD102SN1D
BrandMurata
MYR0.344
Each (In a Pack of 25)
units
0603 (1608M) - 1000Ω - - - 50mA 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. 724-1523
Mfr. Part No.BLM21BD222TN1D
BrandMurata
MYR0.363
Each (In a Pack of 25)
units
0805 (2012M) - 2200Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 1.25mm 2mm 1.25mm 1.25mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 724-1299
Mfr. Part No.BLM18AG601SN1D
BrandMurata
MYR0.228
Each (In a Pack of 25)
units
0603 (1608M) - 600Ω - - - 500mA 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. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
MYR0.61
Each (In a Pack of 25)
units
1206 (3216M) - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - EMI Suppression, Power Supplies
RS Stock No. 125-3207
Mfr. Part No.BLM15GG471SN1D
BrandMurata
MYR0.488
Each (On a Reel of 10000)
units
0402 (1005M) - 470Ω - - - 200mA Chip Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High-GHz Band General Use
RS Stock No. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
MYR0.208
Each (In a Pack of 25)
units
0805 (2012M) - 330Ω - - - 1.5A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 125-3156
Mfr. Part No.BLM31PG330SN1L
BrandMurata
MYR0.429
Each (On a Reel of 3000)
units
1206 (3216M) - 33Ω - - - 6A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 166-9827
Mfr. Part No.BLM31PG601SN1L
BrandMurata
MYR0.357
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 - Power Supplies
RS Stock No. 839-0780
Mfr. Part No.BLM15GA750SN1D
BrandMurata
MYR1.17
Each (In a Bag of 10)
units
0402 (1005M) - 75Ω - - - 200mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, High-GHz Band High-speed signal lines
RS Stock No. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
MYR0.169
Each (In a Pack of 25)
units
0402 (1005M) - 220Ω - - - 450mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
MYR0.085
Each (On a Reel of 4000)
units
0603 (1608M) - 470Ω - - - 1A Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, Power Supplies
RS Stock No. 167-4984
Mfr. Part No.BLM21PG121SN1D
BrandMurata
MYR0.10
Each (On a Reel of 4000)
units
0805 (2012M) - 120Ω - - - 3mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
MYR0.169
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