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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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In Stock TDK RFI Filter (Clip-on) 19.5 mm RS Stock No. 383-178 Mfr. Part No. ZCAT2032-0930 Subtotal (1 unit) £2.17(exc. VAT) £2.17/unit Quantity	TDK	-	RFI Filter	-	-	-	-	-	-	-	-	Clip-on	-	-	-	36mm	-40°C	-	-	85°C	-	-	No	19.5mm
In Stock Wurth Elektronik Ferrite Bead 5.45 mm 5.45 mm (EMI Suppression Axial Ferrite Bead), 27 Ω impedance at 25 MHz, 47 Ω RS Stock No. 332-479 Mfr. Part No. 742700391 Subtotal (1 unit) £0.16(exc. VAT) £0.16/unit Quantity	Wurth Elektronik	-	Ferrite Bead	27Ω	-	47Ω	-	-	-	-	-	-	EMI Suppression Axial Ferrite Bead	-	-	9.8mm	-25°C	-	7.8mm	125°C	5.45mm	-	863 REACH, EU&2015, RoHS 2011	5.45mm
In Stock Murata Ferrite Bead 0.5 mm (Surface) (0402) (Chip Ferrite Bead), 1800 Ω impedance at 100 MHz, 2700 Ω impedance at 1 GHz RS Stock No. 792-6224P Mfr. Part No. BLM15HD182SN1D Subtotal 25 units (supplied on a continuous strip) £1.75(exc. VAT) £0.07/unit Quantity	Murata	0402	Ferrite Bead	-	-	1800Ω	Tape & Reel	-	-	2700Ω	200mA	Surface	Chip Ferrite Bead	-	-	1mm	-55°C	-	0.5mm	125°C	0.5mm	2.2Ω	RoHS, REACH	-
Last RS stock Wurth Elektronik Ferrite Bead 10 mm (Through Hole) (Radial) (EMI Suppression), 209 Ω impedance at 25 MHz, 249 Ω RS Stock No. 124-1516 Mfr. Part No. 74273002 Subtotal (1 pack of 10 units) £8.15(exc. VAT) £0.815/unit Quantity	Wurth Elektronik	Radial	Ferrite Bead	209Ω	-	249Ω	-	-	-	-	4A	Through Hole	EMI Suppression	-	-	10.88mm	-25°C	4	5.49mm	125°C	10mm	2mΩ	REACH, RoHS	-
In Stock TDK RFI Filter 20 mm (Clip-on) 20 mm RS Stock No. 383-172 Mfr. Part No. ZCAT2017-0930 Subtotal (1 unit) £1.32(exc. VAT) £1.32/unit Quantity	TDK	-	RFI Filter	-	-	-	-	-	-	-	-	Clip-on	-	-	-	21mm	-40°C	-	-	85°C	20mm	-	No	20mm
In Stock Murata Ferrite Bead 0.85 mm (Surface) (0805) (Chip Ferrite Bead), 33.3 Ω impedance at 25 MHz, 60 Ω impedance at 100 MHz, RS Stock No. 223-4991P Mfr. Part No. BLM21PG600BH1D Subtotal 100 units (supplied on a continuous strip) £5.80(exc. VAT) £0.058/unit Quantity	Murata	0805	Ferrite Bead	33.3Ω	46.2Ω	60Ω	Tape & Reel	76Ω	-	73.5Ω	10mA	Surface	Chip Ferrite Bead	-	-	2mm	-55°C	-	1.25mm	150°C	0.85mm	20mΩ	REACH, RoHS	-
In Stock Wurth Elektronik Ferrite Ring 5 mm 5 mm (EMI Suppression Toroidal Ferrite), 34 Ω impedance at 25 MHz, 56 Ω impedance at RS Stock No. 332-399 Mfr. Part No. 742701712 Subtotal (1 unit) £0.41(exc. VAT) £0.41/unit Quantity	Wurth Elektronik	-	Ferrite Ring	34Ω	-	56Ω	-	-	-	-	-	-	EMI Suppression Toroidal Ferrite	-	-	8mm	-25°C	-	9mm	125°C	5mm	-	RoHS Approval (2011/65/EU&2015/863), REACh Approval Conform or declared ((EC)1907/2006)	5mm
In Stock Wurth Elektronik Ferrite Bead (Cable) 8 mm (Axial) (EMI Suppression), 144 Ω impedance at 25 MHz, 278 Ω impedance at 100 RS Stock No. 265-1677 Mfr. Part No. 742700726 Subtotal (1 tape of 10 units) £5.17(exc. VAT) £0.517/unit Quantity	Wurth Elektronik	Axial	Ferrite Bead	144Ω	-	278Ω	Bulk	-	-	-	-	Cable	EMI Suppression	-	-	30mm	-25°C	-	-	125°C	-	-	REACH, RoHS	8mm
In Stock Wurth Elektronik Ferrite Bead 5 mm 5 mm (EMI Suppression Axial Ferrite Bead), 100 Ω impedance at 25 MHz, 173 Ω impedance RS Stock No. 332-430 Mfr. Part No. 74270030 Subtotal (1 bag of 10 units) £4.43(exc. VAT) £0.443/unit Quantity	Wurth Elektronik	-	Ferrite Bead	100Ω	-	173Ω	-	-	-	-	-	-	EMI Suppression Axial Ferrite Bead	-	-	18.5mm	-25°C	-	11.5mm	125°C	5mm	-	RoHS 2011, EU&2015, 863 REACH or declared EC1907, 2006 Halogen Free JEDEC JS709B Halogen Free IEC 61249-2-21	5mm
In Stock Wurth Elektronik Ferrite Bead 2.3 mm (Surface) (1812) (Bead), 100 Ω impedance at 100 MHz RS Stock No. 749-8328P Mfr. Part No. 74279226101 Subtotal 5 units (supplied as a tape) £2.86(exc. VAT) £0.572/unit Quantity	Wurth Elektronik	1812	Ferrite Bead	-	-	100Ω	Tape & Reel	-	-	-	8A	Surface	Bead	-	-	4.5mm	-55°C	-	3.2mm	125°C	2.3mm	6mΩ	RoHS, REACH	-
Limited stock Amidon Ferrite Bead (Ring) 14.2 mm (Ring Core), 300 Ω impedance at 100 MHz RS Stock No. 288-4433 Mfr. Part No. FB-31-5621 Subtotal (1 unit) £3.67(exc. VAT) £3.67/unit Quantity	Amidon	-	Ferrite Bead	-	-	300Ω	-	-	-	-	-	Ring	Ring Core	-	-	28.5mm	-	-	-	-	-	-	No	14.2mm
In Stock Bourns Ferrite Bead 0.7 mm (Surface) (0805) (EMI Filter & Protection), 30 Ω impedance at 25 MHz, 60 Ω impedance at 100 RS Stock No. 246-3246P Mfr. Part No. MH2029-600Y Subtotal 100 units (supplied on a continuous strip) £3.80(exc. VAT) £0.038/unit Quantity	Bourns	0805	Ferrite Bead	30Ω	42Ω	60Ω	Reel	80Ω	-	-	5A	Surface	EMI Filter & Protection	-	-	3.2mm	-25°C	2	1mm	125°C	0.7mm	20mΩ	RoHS	-
In Stock Murata Ferrite Bead 1.6 mm (Surface) (1806) (Chip Ferrite Bead), 60 Ω impedance at 100 MHz RS Stock No. 188-8665P Mfr. Part No. BLM41PG600SN1L Subtotal 10 units (supplied on a continuous strip) £2.43(exc. VAT) £0.243/unit Quantity	Murata	1806	Ferrite Bead	-	-	60Ω	-	-	-	-	6A	Surface	Chip Ferrite Bead	-	-	4.5mm	-55°C	-	1.6mm	125°C	1.6mm	9mΩ	EIA STD	-
In Stock Murata Ferrite Bead 0.5 mm (Surface) (0402) (Chip Ferrite Bead), 1000 Ω impedance at 100 MHz RS Stock No. 792-6192 Mfr. Part No. BLM15AX102SN1D Subtotal (1 bag of 25 units) £0.85(exc. VAT) £0.034/unit Quantity	Murata	0402	Ferrite Bead	-	-	1000Ω	Tape & Reel	-	-	-	350mA	Surface	Chip Ferrite Bead	-	-	1mm	-55°C	-	0.5mm	125°C	0.5mm	490mΩ	REACH, RoHS	-
In Stock Wurth Elektronik Ferrite Bead 0.5 mm (Surface) (0402) (EMI Suppression), 120 Ω impedance at 100 MHz RS Stock No. 669-3973P Mfr. Part No. 74279271 Subtotal 10 units (supplied on a continuous strip) £1.51(exc. VAT) £0.151/unit Quantity	Wurth Elektronik	0402	Ferrite Bead	-	-	120Ω	Tape & Reel	-	-	-	350mA	Surface	EMI Suppression	-	-	1mm	-55°C	-	0.5mm	125°C	0.5mm	350mΩ	RoHS	-
In Stock Murata Ferrite Bead (1206) (Chip Ferrite Bead), 470 Ω impedance at 100 MHz RS Stock No. 276-3661 Mfr. Part No. BLM31KN471SN1L Subtotal (1 tape of 10 units) £1.65(exc. VAT) £0.165/unit Quantity	Murata	1206	Ferrite Bead	-	-	470Ω	-	-	-	-	4A	-	Chip Ferrite Bead	-	-	3.2mm	-55°C	-	-	125°C	-	0.02Ω	No	-
In Stock Murata Ferrite Bead 0.85 mm (Surface) (0805) (Chip Bead), 1000 Ω impedance at 100 MHz RS Stock No. 104-8537 Mfr. Part No. BLM21AG102SH1D Subtotal (1 pack of 50 units) £3.35(exc. VAT) £0.067/unit Quantity	Murata	0805	Ferrite Bead	-	-	1000Ω	-	-	-	-	500mA	Surface	Chip Bead	-	-	2mm	-55°C	-	1.25mm	125°C	0.85mm	0.28Ω	REACH, RoHS	-
In Stock Murata Ferrite Bead 1.1 mm (Surface) (1206) (Chip Ferrite Bead), 33 Ω impedance at 100 MHz RS Stock No. 724-1576P Mfr. Part No. BLM31PG330SN1L Subtotal 25 units (supplied on a continuous strip) £3.55(exc. VAT) £0.142/unit Quantity	Murata	1206	Ferrite Bead	-	-	33Ω	-	-	-	-	6A	Surface	Chip Ferrite Bead	-	-	3.2mm	-55°C	-	1.6mm	125°C	1.1mm	9mΩ	REACH, RoHS	-
In Stock Murata Ferrite Bead 0.8 mm (Surface) (0603) (Chip Ferrite Bead), 1000 Ω impedance at 100 MHz RS Stock No. 230-3783P Mfr. Part No. BLM18AG102SN1D Subtotal 20 units (supplied on a continuous strip) £1.04(exc. VAT) £0.052/unit Quantity	Murata	0603	Ferrite Bead	-	-	1000Ω	Tape & Reel	-	-	-	400mA	Surface	Chip Ferrite Bead	-	-	1.6mm	-55°C	-	0.8mm	125°C	0.8mm	500mΩ	RoHS, REACH	-
In Stock Wurth Elektronik Ferrite Bead 0.9 mm (Surface) (0805) (Ferrite Bead), 1500 Ω impedance at 100 MHz RS Stock No. 124-1838P Mfr. Part No. 742792097 Subtotal 50 units (supplied on a continuous strip) £9.15(exc. VAT) £0.183/unit Quantity	Wurth Elektronik	0805	Ferrite Bead	-	-	1500Ω	Tape & Reel	-	-	-	1A	Surface	Ferrite Bead	-	-	2mm	-55°C	2	1.2mm	125°C	0.9mm	0.3Ω	RoHS, REACH	-