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 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. 260-6874
Mfr. Part No.74279204
R 3.275
Each (In a Pack of 10)
units
0805 (2012M) - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS stock no. 167-4984
Mfr. Part No.BLM21PG121SN1D
BrandMurata
R 0.411
Each (On a Reel of 4000)
units
0805 (2012M) - 120Ω - - - 3mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, Power Supplies
RS stock no. 792-6259
Mfr. Part No.BLM18HE152SN1D
BrandMurata
R 1.653
Each (In a Bag of 25)
units
0603 (1608M) - 1500Ω - - - 500mA 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. 144-9814
Mfr. Part No.74279204
R 2.637
Each (On a Reel of 4000)
units
0805 - - - - - - - 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm - General Electronics
RS stock no. 839-0806
Mfr. Part No.BLM15PD600SN1D
BrandMurata
R 0.629
Each (In a Bag of 100)
units
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS stock no. 125-3155
Mfr. Part No.BLM31PG391SN1L
BrandMurata
R 4,115.46
1 Reel of 3000
Reel(s)
1206 (3216M) - 390Ω - - - 2A Chip Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 724-1429
Mfr. Part No.BLM18PG600SN1D
BrandMurata
R 0.95
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. 167-4834
Mfr. Part No.BLM15PD600SN1D
BrandMurata
R 2,418.01
1 Reel of 10000
Reel(s)
0402 (1005M) - 60Ω - - - 1.7A Chip Ferrite Bead 1 x 0.5 x 0.5mm 1mm 0.5mm 0.5mm - EMI Suppression Filter, Power Supplies
RS stock no. 724-1598
Mfr. Part No.BLM41PG102SN1L
BrandMurata
R 3.368
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. 166-9764
Mfr. Part No.BLM21BD601SN1D
BrandMurata
R 2,253.76
1 Reel of 4000
Reel(s)
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 166-9616
Mfr. Part No.BL01RN1A2A2B
BrandMurata
R 1.354
Each (In a Bag of 500)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 125-3156
Mfr. Part No.BLM31PG330SN1L
BrandMurata
R 4,115.46
1 Reel of 3000
Reel(s)
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. 724-1570
Mfr. Part No.BLM31PG391SN1L
BrandMurata
R 2.692
Each (In a Pack of 25)
units
1206 (3216M) - 390Ω - - - 2A Chip Ferrite Bead 3.2 x 1.6 x 1.1mm 3.2mm 1.6mm 1.1mm - Power Supplies
RS stock no. 144-9837
Mfr. Part No.742792653
R 5,206.21
1 Reel of 4000
Reel(s)
0603 - 600Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 230-3828
Mfr. Part No.BLM21BD601SN1D
BrandMurata
R 1.617
Each (In a Pack of 20)
units
0805 (2012M) - 600Ω - - - 200mA Chip Ferrite Bead 2 x 1.25 x 0.85mm 2mm 1.25mm 0.85mm - EMI Suppression Filter, High Speed Signal Lines
RS stock no. 724-1393
Mfr. Part No.BLM18PG181SN1D
BrandMurata
R 0.95
Each (In a Pack of 25)
units
0603 (1608M) - 180Ω - - - 1.5A 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. 724-1576
Mfr. Part No.BLM31PG330SN1L
BrandMurata
R 2.188
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. 724-1609
Mfr. Part No.BL01RN1A2A2B
BrandMurata
R 2.112
Each (In a Pack of 25)
units
Axial - - - - - 7A EMI Suppression 3.6 (Dia.) x 5mm 5mm - 5mm 3.6mm -
RS stock no. 669-3992
Mfr. Part No.742792653
R 2.648
Each (In a Pack of 10)
units
0603 (1608M) - 600Ω - - - 300mA EMI Suppression 1.6 x 0.8 x 0.8mm 1.6mm 0.8mm 0.8mm - Suppression Components
RS stock no. 161-8051
Mfr. Part No.BLM18PG600SN1D
BrandMurata
R 1,536.09
1 Reel of 4000
Reel(s)
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