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
  • DVD's
  • Gaming Systems

...
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Description Price Package Type Impedance at 25 MHz Impedance at 50 MHz Impedance at 100 MHz Impedance at 300 MHz Impedance at 500 MHz Impedance at 1 GHz Current Rating Type Dimensions Length Depth Height Maximum DC Resistance
RS Stock No. 124-1516
Mfr. Part No.74273002
kr 9,73
Each (In a Pack of 10)
Units
Radial 209Ω - 249Ω - - - 4A EMI Suppression 10.88 x 5.49 x 10mm 10.88mm 5.49mm 10mm -
RS Stock No. 736-2100
Mfr. Part No.7427930
kr 7,534
Each (In a Bag of 10)
Units
SMD 58Ω - 42Ω - - - 6A High Current 4 x 3 x 2.55mm 4mm 3mm 2.55mm 900mΩ
RS Stock No. 144-9855
Mfr. Part No.7427930
kr 5,027
Each (On a Reel of 500)
Units
- - - 42Ω - - - 6A Ferrite Bead 4 x 3 x 2.55mm 4mm 3mm 2.55mm 600mΩ
RS Stock No. 888-3351
Mfr. Part No.28A2025-0A0
kr 9,56
Each (In a Pack of 50)
Units
2025 130Ω - 320Ω 510Ω - - - Cylindrical EMI Core 18.15 x 32.5 x 18.9mm 18.15mm 32.5mm 18.9mm -
RS Stock No. 839-0803
Mfr. Part No.BLM18AG102SH1D
BrandMurata
kr 0,63
Each (In a Bag of 100)
Units
0603 (1608M) - - 1000Ω - - - 400mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm 500mΩ
RS Stock No. 167-4989
Mfr. Part No.BLM18AG102SH1D
BrandMurata
kr 0,38
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 500mΩ
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
kr 0,761
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 45mΩ
RS Stock No. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
kr 1,109
Each (In a Pack of 20)
Units
0603 (1608M) - - 1000Ω - - - 400mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm 500mΩ
RS Stock No. 792-6299
Mfr. Part No.BLM18TG221TN1D
BrandMurata
kr 0,283
Each (In a Bag of 25)
Units
0603 (1608M) - - 220Ω - - - 200mA Chip Ferrite Bead 1.6 x 0.8 x 0.6mm 1.6mm 0.8mm 0.6mm 300mΩ
RS Stock No. 724-1337
Mfr. Part No.BLM18EG601SN1D
BrandMurata
kr 1,026
Each (In a Pack of 25)
Units
0603 (1608M) - - 600Ω - - 700Ω 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm 350mΩ
RS Stock No. 144-9818
Mfr. Part No.742792514
kr 2,40
Each (On a Reel of 1000)
Units
1812 - - 600Ω - - - 3A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm 40mΩ
RS Stock No. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
kr 0,323
Each (On a Reel of 4000)
Units
0603 (1608M) - - 1000Ω - - - 400mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm 500mΩ
RS Stock No. 166-9826
Mfr. Part No.BLM31PG121SN1L
BrandMurata
kr 0,865
Each (On a Reel of 3000)
Units
1206 (3216M) - - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm 20mΩ
RS Stock No. 358-6579
Mfr. Part No.742792514
kr 3,022
Each (In a Pack of 10)
Units
1812 (4532M) - - 600Ω - - - 3A EMI Suppression 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm 40mΩ
RS Stock No. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
kr 2,544
Each (In a Pack of 25)
Units
1206 (3216M) - - 120Ω - - - 3.5A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm 20mΩ
RS Stock No. 749-8296
Mfr. Part No.74279223560
kr 6,74
Each (In a Bag of 5)
Units
1612 (4131M) - - 56Ω - - 90Ω 10A Bead 4.06 x 3.05 x 2.28mm 4.06mm 3.05mm 2.28mm 4mΩ
RS Stock No. 125-3148
Mfr. Part No.BLM18EG601SN1D
BrandMurata
kr 0,306
Each (On a Reel of 4000)
Units
0603 (1608M) - - 600Ω - - 700Ω 500mA Chip Ferrite Bead 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm 350mΩ
RS Stock No. 260-6830
Mfr. Part No.7427503
kr 6,20
Each
Units
Axial 489Ω - 600Ω - - - 3A Ferrite Bead 6 (Dia.) x 10mm 10mm - - 20mΩ
RS Stock No. 724-1545
Mfr. Part No.BLM21PG331SN1D
BrandMurata
kr 0,665
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 70mΩ
RS Stock No. 669-4080
Mfr. Part No.742792063
kr 2,37
Each (In a Pack of 10)
Units
0805 (2012M) - - 60Ω - - - 3A EMI Suppression 2 x 1.2 x 0.9mm 2mm 1.2mm 0.9mm 25mΩ