Ferrite Beads

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. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
£0.051
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. 683-5247
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
£0.815
Each (In a Pack of 10)
Units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 170-4654
Mfr. Part No.WBC2.5/A-4B1
BrandFERROXCUBE
£0.35
Each (On a Reel of 1000)
Units
Axial - - - - - - Bead 6 (Dia.) x 10mm - - 10mm 6mm EMI Suppression, RFI Suppression
RS Stock No. 741-3191
Mfr. Part No.MPZ2012S331AT
BrandTDK
£0.034
Each (In a Bag of 100)
Units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - -
RS Stock No. 124-1517
Mfr. Part No.7427502
£0.423
Each (In a Pack of 20)
Units
Axial 670Ω 976Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm General Electronics
RS Stock No. 724-1380
Mfr. Part No.BLM18PG121SN1D
BrandMurata
£0.038
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. 888-3355
Mfr. Part No.28A2025-0A2
£0.657
Each (In a Pack of 50)
Units
2025 130Ω 320Ω 510Ω - - - Snap-On EMI Core, Split EMI Core 18.15 x 32.5 x 18.9mm 18.15mm 32.5mm 18.9mm - EMI Suppression
RS Stock No. 724-1605
Mfr. Part No.BL01RN1A1D2B
BrandMurata
£0.101
Each (In a Pack of 25)
Units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
£0.056
Each (On a Reel of 500)
Units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS Stock No. 888-3339
Mfr. Part No.28A0593-0A2
£0.833
Each (In a Pack of 50)
Units
0593 186Ω 407Ω 575Ω - - - Snap-On EMI Core, Split EMI Core 18.75 x 52.91mm 52.91mm - - 18.75mm EMI Suppression
RS Stock No. 124-1521
Mfr. Part No.74275043
£0.325
Each (In a Pack of 20)
Units
Radial 920Ω 961Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - 10mm 6mm General Electronics
RS Stock No. 724-1589
Mfr. Part No.BLM31PG500SN1L
BrandMurata
£0.166
Each (In a Pack of 25)
Units
1206 (3216M) - 50Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 166-9828
Mfr. Part No.BLM31PG500SN1L
BrandMurata
£0.058
Each (On a Reel of 3000)
Units
1206 (3216M) - 50Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS Stock No. 163-3214
Mfr. Part No.74275022
£0.208
Each (In a Bag of 200)
Units
Axial - - - - - - - 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 358-6563
Mfr. Part No.74275022
£1.00
Each
Units
Axial - - - - - - Bead 6 (Dia.) x 10mm 10mm - - 6mm General Electronics
RS Stock No. 724-1582
Mfr. Part No.BLM31PG601SN1L
BrandMurata
£0.129
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. 166-9827
Mfr. Part No.BLM31PG601SN1L
BrandMurata
£0.064
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. 724-1299
Mfr. Part No.BLM18AG601SN1D
BrandMurata
£0.034
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. 125-3151
Mfr. Part No.BLM18SG121TN1D
BrandMurata
£0.02
Each (On a Reel of 10000)
Units
0603 (1608M) - 120Ω - - - 3mA Chip Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
RS Stock No. 724-1447
Mfr. Part No.BLM18SG121TN1D
BrandMurata
£0.072
Each (In a Pack of 25)
Units
0603 (1608M) - 120Ω - - - 3mA Chip Ferrite Bead 1.6 x 0.8 x 0.5mm 1.6mm 0.8mm 0.5mm - EMI Suppression Filter, Power Supplies (Low DC Resistance Type)
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