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


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 Diameter
RS Stock No. 124-1516
Mfr. Part No.74273002
kr 7,916
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 6,241
Each (In a Bag of 10)
Units
SMD 58Ω - 42Ω - - - 6A High Current 4 x 3 x 2.55mm 4mm 3mm 2.55mm -
RS Stock No. 144-9855
Mfr. Part No.7427930
kr 4,494
Each (On a Reel of 500)
Units
- - - 42Ω - - - 6A Ferrite Bead 4 x 3 x 2.55mm 4mm 3mm 2.55mm -
RS Stock No. 888-3351
Mfr. Part No.28A2025-0A0
kr 8,319
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. 724-1605
Mfr. Part No.BL01RN1A1D2B
BrandMurata
kr 1,168
Each (In a Pack of 25)
Units
Axial - - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm 5mm 5mm 3.6mm
RS Stock No. 125-3159
Mfr. Part No.BL01RN1A1D2B
BrandMurata
kr 0,642
Each (On a Reel of 500)
Units
Axial - - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm 5mm 5mm 3.6mm
RS Stock No. 839-0803
Mfr. Part No.BLM18AG102SH1D
BrandMurata
kr 0,398
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 -
RS Stock No. 167-4989
Mfr. Part No.BLM18AG102SH1D
BrandMurata
kr 0,236
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 -
RS Stock No. 724-1573
Mfr. Part No.BLM31PG121SN1L
BrandMurata
kr 2,197
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 -
RS Stock No. 724-1532
Mfr. Part No.BLM21PG221SN1D
BrandMurata
kr 0,648
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 -
RS Stock No. 144-9818
Mfr. Part No.742792514
kr 2,076
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 -
RS Stock No. 125-3123
Mfr. Part No.BLM18AG102SN1D
BrandMurata
kr 0,154
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 -
RS Stock No. 724-1337
Mfr. Part No.BLM18EG601SN1D
BrandMurata
kr 1,144
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 -
RS Stock No. 230-3783
Mfr. Part No.BLM18AG102SN1D
BrandMurata
kr 0,571
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 -
RS Stock No. 125-3148
Mfr. Part No.BLM18EG601SN1D
BrandMurata
kr 0,264
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 -
RS Stock No. 792-6299
Mfr. Part No.BLM18TG221TN1D
BrandMurata
kr 0,243
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 -
RS Stock No. 358-6579
Mfr. Part No.742792514
kr 2,609
Each (In a Pack of 10)
Units
1812 (4532M) - - 600Ω - - - 3A - 4.5 x 3.2 x 1.5mm 4.5mm 3.2mm 1.5mm -
RS Stock No. 888-3569
Mfr. Part No.HFA259131-0A2
kr 53,81
Each
Units
259131 - - - 250Ω 315Ω 200Ω - Snap-On EMI Core, Split EMI Core 29 x 32.5 x 29.62mm 29mm 32.5mm 29.62mm -
RS Stock No. 166-9826
Mfr. Part No.BLM31PG121SN1L
BrandMurata
kr 0,747
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 -
RS Stock No. 749-8296
Mfr. Part No.74279223560
kr 5,848
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 -