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 stock no. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
R 0.303
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 450mA Chip Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression, General Electronics
RS stock no. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
R 0.813
Each (In a Pack of 20)
units
0603 (1608M) - 1000Ω - - - 450mA 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. 724-1536
Mfr. Part No.BLM21PG300SN1D
BrandMurata
R 1.135
Each (In a Pack of 25)
units
0805 (2012M) - 30Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 166-9869
Mfr. Part No.BLM21PG300SN1D
BrandMurata
R 0.416
Each (On a Reel of 4000)
units
0805 (2012M) - 30Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
R 0.226
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. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
R 0.678
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
RS stock no. 724-1582
Mfr. Part No.BLM31PG601SN1L
BrandMurata
R 1.784
Each (In a Pack of 25)
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. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
R 1.022
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. 724-1542
Mfr. Part No.BLM21PG600SN1D
BrandMurata
R 0.614
Each (In a Pack of 25)
units
0805 (2012M) - 60Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 166-9870
Mfr. Part No.BLM21PG600SN1D
BrandMurata
R 0.329
Each (On a Reel of 4000)
units
0805 (2012M) - 60Ω - - - 3A Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 125-3154
Mfr. Part No.BLM21PG331SN1D
BrandMurata
R 0.306
Each (On a Reel of 4000)
units
0805 (2012M) - 330Ω - - - 1.5A Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, Power Supplies
RS stock no. 166-9827
Mfr. Part No.BLM31PG601SN1L
BrandMurata
R 1.327
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. 169-6263
Mfr. Part No.BLM21PG331SN1J
BrandMurata
R 0.397
Each (On a Reel of 10000)
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. 724-1548
Mfr. Part No.BLM21PG331SN1J
BrandMurata
R 1.197
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. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
R 2.692
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. 166-9826
Mfr. Part No.BLM31PG121SN1L
BrandMurata
R 1.28
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. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
R 0.996
Each (In a Bag of 100)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS stock no. 144-9872
Mfr. Part No.742792664
R 1.265
Each (On a Reel of 4000)
units
0603 - 1000Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 724-1469
Mfr. Part No.BLM21AG102SN1D
BrandMurata
R 1.336
Each (In a Pack of 25)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, General Use
RS stock no. 125-3152
Mfr. Part No.BLM21AG102SN1D
BrandMurata
R 2,238.18
Each (On a Reel of 4000)
units
0805 (2012M) - 1000Ω - - - 600mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, General Electronics