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. 724-1429
Mfr. Part No.BLM18PG600SN1D
BrandMurata
SGD0.074
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. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
SGD0.031
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. 166-9844
Mfr. Part No.BLM18BB121SN1D
BrandMurata
SGD0.034
Each (On a Reel of 4000)
units
0603 (1608M) - 120Ω - - - 550mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 724-1299
Mfr. Part No.BLM18AG601SN1D
BrandMurata
SGD0.058
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. 724-1309
Mfr. Part No.BLM18BB121SN1D
BrandMurata
SGD0.088
Each (In a Pack of 25)
units
0603 (1608M) - 120Ω - - - 550mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - EMI Suppression Filter, High Speed Signal Lines
RS Stock No. 724-1425
Mfr. Part No.BLM18PG471SN1D
BrandMurata
SGD0.074
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
SGD0.031
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. 230-3907
Mfr. Part No.BLM31AF700SN1L
BrandMurata
SGD0.183
Each (In a Pack of 20)
units
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 161-8080
Mfr. Part No.BLM31AF700SN1L
BrandMurata
SGD250.95
1 Reel of 2500
Reel(s)
1206 (3216M) - - - - - - Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - -
RS Stock No. 166-9559
Mfr. Part No.BLM15HD102SN1D
BrandMurata
SGD0.073
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 High-speed Signal Lines
RS Stock No. 839-0796
Mfr. Part No.BLM15PD300SN1D
BrandMurata
SGD0.025
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. 167-4833
Mfr. Part No.BLM15PD300SN1D
BrandMurata
SGD0.034
Each (On a Reel of 10000)
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. 724-1264
Mfr. Part No.BLM15AG221SN1D
BrandMurata
SGD0.08
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. 747-4720
Mfr. Part No.BLM18KG601SN1D
BrandMurata
SGD0.053
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. 724-1277
Mfr. Part No.BLM15HD102SN1D
BrandMurata
SGD0.168
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 High-speed Signal Lines
RS Stock No. 167-4830
Mfr. Part No.BLM15AX100SN1D
BrandMurata
SGD0.032
Each (On a Reel of 10000)
units
0402 (1005M) - 10Ω - - - 1.74A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, General Use
RS Stock No. 167-4989
Mfr. Part No.BLM18AG102SH1D
BrandMurata
SGD0.037
Each (On a Reel of 4000)
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. 724-1627
Mfr. Part No.BL03RN2R1M1B
BrandMurata
SGD0.22
Each (In a Pack of 25)
units
Radial - - - - - 6A EMI Suppression 8.3 x 2.3 x 6.5mm 8.3mm 2.3mm 6.5mm - -
RS Stock No. 167-4982
Mfr. Part No.BLM18HE601SN1D
BrandMurata
SGD0.078
Each (On a Reel of 4000)
units
0603 (1608M) - 600Ω - - - 800mA 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. 724-1469
Mfr. Part No.BLM21AG102SN1D
BrandMurata
SGD0.123
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