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. 327-5566
Mfr. Part No.74279218
R 2.975
Each (In a Pack of 10)
units
1206 (3216M) - 600Ω - - - 2A - 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - General Electronics
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. 144-9805
Mfr. Part No.74279218
R 2.25
Each (On a Reel of 3000)
units
1206 - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 124-1869
Mfr. Part No.74279218
R 4.782
Each (In a Pack of 50)
units
1206 (3216M) - 600Ω - - - 2A Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - 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. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
R 0.479
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. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
R 0.953
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. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
R 0.95
Each (In a Pack of 25)
units
0603 (1608M) - 120Ω - - - 2A 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. 724-1431
Mfr. Part No.BLM18RK102SN1D
BrandMurata
R 0.777
Each (In a Pack of 25)
units
0603 (1608M) - 1000Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Digital Interface, EMI Suppression Filter
RS stock no. 166-9858
Mfr. Part No.BLM18RK102SN1D
BrandMurata
R 0.247
Each (On a Reel of 4000)
units
0603 (1608M) - 1000Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Digital Interface, EMI Suppression Filter
RS stock no. 161-8072
Mfr. Part No.BLM18AG121SN1D
BrandMurata
R 0.211
Each (On a Reel of 4000)
units
0603 (1608M) - 120Ω - - - 800mA 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. 239-589
Mfr. Part No.BL01RN1A1F1J
BrandMurata
R 2.431
Each (In a Pack of 10)
units
Axial - - - - - 7A Bead 3.6 (Dia.) x 5mm 5mm - - 3.6mm General Electronics
RS stock no. 747-4720
Mfr. Part No.BLM18KG601SN1D
BrandMurata
R 0.479
Each (In a Bag of 100)
units
0603 (1608M) - 600Ω - - - 1.3A Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, GHz Band Digital Interface
RS stock no. 125-3147
Mfr. Part No.BLM18EG221SN1D
BrandMurata
R 0.461
Each (On a Reel of 4000)
units
0603 (1608M) - 220Ω - - - 2A Chip 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. 202-3550
Mfr. Part No.BLM18AG121SN1D
BrandMurata
R 0.604
Each (In a Pack of 20)
units
0603 (1608M) - 120Ω - - - 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. 125-3153
Mfr. Part No.BLM21AG601SN1D
BrandMurata
R 2,234.84
Each (On a Reel of 4000)
units
0805 (2012M) - 600Ω - - - 700mA Chip Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression, General Electronics
RS stock no. 724-1328
Mfr. Part No.BLM18EG221SN1D
BrandMurata
R 1.436
Each (In a Pack of 25)
units
0603 (1608M) - 220Ω - - - 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. 167-4984
Mfr. Part No.BLM21PG121SN1D
BrandMurata
R 0.411
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. 792-6300
Mfr. Part No.BLM21PG121SN1D
BrandMurata
R 0.981
Each (In a Bag of 25)
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. 792-6259
Mfr. Part No.BLM18HE152SN1D
BrandMurata
R 1.686
Each (In a Bag of 25)
units
0603 (1608M) - 1500Ω - - - 500mA 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. 144-9814
Mfr. Part No.74279204
R 2.121
Each (On a Reel of 4000)
units
0805 - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics