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. 125-3147
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. 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. 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
RS stock no. 125-3155
Mfr. Part No.BLM31PG391SN1L
BrandMurata
R 1.292
Each (On a Reel of 3000)
units
1206 (3216M) - 390Ω - - - 2A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 724-1429
Mfr. Part No.BLM18PG600SN1D
BrandMurata
R 0.822
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. 230-3828
Mfr. Part No.BLM21BD601SN1D
BrandMurata
R 1.617
Each (In a Pack of 20)
units
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 125-3156
Mfr. Part No.BLM31PG330SN1L
BrandMurata
R 1.273
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. 724-1570
Mfr. Part No.BLM31PG391SN1L
BrandMurata
R 2.692
Each (In a Pack of 25)
units
1206 (3216M) - 390Ω - - - 2A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 724-1609
Mfr. Part No.BL01RN1A2A2B
BrandMurata
R 2.168
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 167-4834
Mfr. Part No.BLM15PD600SN1D
BrandMurata
R 0.176
Each (On a Reel of 10000)
units
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS stock no. 144-9837
Mfr. Part No.742792653
R 1.264
Each (On a Reel of 4000)
units
0603 - 600Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 166-9616
Mfr. Part No.BL01RN1A2A2B
BrandMurata
R 1.354
Each (In a Bag of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 166-9764
Mfr. Part No.BLM21BD601SN1D
BrandMurata
R 0.586
Each (On a Reel of 4000)
units
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 724-1393
Mfr. Part No.BLM18PG181SN1D
BrandMurata
R 0.701
Each (In a Pack of 25)
units
0603 (1608M) - 180Ω - - - 1.5A 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. 724-1576
Mfr. Part No.BLM31PG330SN1L
BrandMurata
R 2.234
Each (In a Pack of 25)
units
1206 (3216M) - 33Ω - - - 6A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
R 1,536.09
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. 724-1598
Mfr. Part No.BLM41PG102SN1L
BrandMurata
R 3.288
Each (In a Pack of 25)
units
1806 (4516M) - 1000Ω - - - 1.5A Chip Ferrite Bead 4.5 x 1.6 x 1.6mm 4.5mm 1.6mm 1.6mm - Power Supplies
RS stock no. 669-3992
Mfr. Part No.742792653
R 2.648
Each (In a Pack of 10)
units
0603 (1608M) - 600Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 839-0806
Mfr. Part No.BLM15PD600SN1D
BrandMurata
R 0.407
Each (In a Bag of 100)
units
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS stock no. 172-9972
Mfr. Part No.2944666651
BrandFair-Rite
R 3.991
Each (In a Box of 200)
units
Radial - 600Ω - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm EMI Suppression