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. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
TWD2.00
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. 724-1548
Mfr. Part No.BLM21PG331SN1J
BrandMurata
TWD6.00
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. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
TWD2.60
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. 169-6263
Mfr. Part No.BLM21PG331SN1J
BrandMurata
TWD1.50
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. 125-3154
Mfr. Part No.BLM21PG331SN1D
BrandMurata
TWD0.90
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. 724-1598
Mfr. Part No.BLM41PG102SN1L
BrandMurata
TWD9.20
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. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
TWD2.00
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. 125-3150
Mfr. Part No.BLM18PG471SN1D
BrandMurata
TWD0.70
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. 166-9555
Mfr. Part No.BLM15AG102SN1D
BrandMurata
TWD0.70
Each (On a Reel of 10000)
units
0402 (1005M) - 1000Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 166-9560
Mfr. Part No.BLM15HG102SN1D
BrandMurata
TWD1.90
Each (On a Reel of 10000)
units
0402 (1005M) - 1000Ω - - - 250mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 839-0777
Mfr. Part No.BLM03AX601SN1D
BrandMurata
TWD3.30
Each (In a Bag of 50)
units
0201 (0603M) - 600Ω - - - 250mA Chip Ferrite Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - EMI Suppression Filter, General Use
RS Stock No. 724-1286
Mfr. Part No.BLM15HG102SN1D
BrandMurata
TWD3.80
Each (In a Pack of 25)
units
0402 (1005M) - 1000Ω - - - 250mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use
RS Stock No. 724-1251
Mfr. Part No.BLM15AG102SN1D
BrandMurata
TWD1.60
Each (In a Pack of 25)
units
0402 (1005M) - 1000Ω - - - 300mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 167-4862
Mfr. Part No.BLM03AX601SN1D
BrandMurata
TWD1.50
Each (On a Reel of 15000)
units
0201 (0603M) - 600Ω - - - 250mA Chip Ferrite Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - EMI Suppression Filter, General Use
RS Stock No. 124-8151
Mfr. Part No.BLM03AG102SN1D
BrandMurata
TWD1.70
Each (In a Pack of 500)
units
0603 (1608M) - 1000Ω - - - 100mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - General Use
RS Stock No. 839-0796
Mfr. Part No.BLM15PD300SN1D
BrandMurata
TWD1.40
Each (In a Bag of 100)
units
0402 (1005M) - 30Ω - - - 2.2A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS Stock No. 724-1576
Mfr. Part No.BLM31PG330SN1L
BrandMurata
TWD5.70
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. 169-2757
Mfr. Part No.BLM03AG102SN1D
BrandMurata
TWD1.10
Each (On a Reel of 15000)
units
0603 (1608M) - 1000Ω - - - 100mA Chip Bead 0.6 x 0.3 x 0.3mm 0.6mm 0.3mm 0.3mm - General Use
RS Stock No. 125-3156
Mfr. Part No.BLM31PG330SN1L
BrandMurata
TWD3.20
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. 166-9558
Mfr. Part No.BLM15EG221SN1D
BrandMurata
TWD2.10
Each (On a Reel of 10000)
units
0402 (1005M) - 220Ω - - - 220mA Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, GHz Band General Use (Low DC Resistance Type)