Ferrites for EMI suppression

Technology: Ferrite cores
Partner: Ferroxcube

EMI suppression is a critical point in electronic/electric products that engineers need to consider in the early stages of product development. High permeability ferrites offer the best solution in terms of efficiency and cost.

Working temperature, flux density, high impedance, and initial permeability are key parameters to select the proper material.

Ferrites in this range are made of both alloys, manganese zinc (MnZn) and nickel-zinc (NiZn) at a slightly higher cost solution.

Shapes that typically are used in this application are toroids and U for CMC, cable shields, beads, rods, and balun.

Material names in this range start with 3Ex. Examples are 3E10 and 3E65 covering a range of permeability 5K to 15K; or with 3Sx like 3S4, optimised for frequencies from 10MHz up to 300MHz; or 4Sx like 4S3, made of NiZn for range 30MHz to 1GHz.

Range features

A high level overview of what this range offers

Medium cost materials (NiZn & MnZn)
Development trend:- Increase frequency range for high impedance- Increase permeability stability through temperature- Increase Bsat VS Temp
Available shapes: toroids, E, U, BD, BDS, BDW, MLS, CMS, RODs, cable shields, WBS, and WBC
Permeabilities above 4000 for 3Ex
Low permeabilities for 3Sx and 4Sx
Low Curie temperature: between 110°C and 255°C
3Ex series also used for wideband signals, pulse transformers, and delay lines

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Ferroxcube high permeability materials for EMI suppression

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Ferroxcube low permeability materials for EMI suppression

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What’s in this range?

All the variants in the range and a comparison of what they offer

High permeability materials

Material	µi at 25°C	Bsat (mT) at 25°C	Tc (°C)	Ferrite type	Notes
3C11	4300	390	= 125	MnZn	Frequency < 30MHz
3E65	5200	480	= 165	MnZn	Frequency < 20MHz
3E25	6000	390	= 125	MnZn	Frequency < 20MHz
3E27	6000	430	≥ 150	MnZn	Frequency < 20MHz
3E26	7000	430	≥ 155	MnZn	Frequency < 20MHz
3E10	10000	460	≥ 130	MnZn	Frequency < 20MHz
3E6	10000	460	≥ 130	MnZn	Frequency < 15MHz
3E12	12000	470	≥ 130	MnZn	Frequency < 15MHz
3E15	15000	470	≥ 130	MnZn	Frequency < 15MHz

Low permeability materials

Material	µi at 25°C	Bsat (mT) at 25°C	Tc (°C)	Ferrite type	Notes
3B1	900	380	≥ 150	MnZn
3S1	4000	400	≥ 125	MnZn	Frequency < 30MHz
3S3	350	320	≥ 225	MnZn	Frequency < 200MHz
3S4	1700	320	≥ 110	MnZn	Frequency < 100MHz
3S5	3800	545	≥ 255	MnZn	Frequency < 30MHz
4B1	250	360	≥ 250	NiZn	Frequency < 300MHz
4S2	850	340	≥ 150	NiZn	Frequency < 100MHz
4S2F	700	290	≥ 120	NiZn	Frequency < 100MHz
4S3	250	360	≥ 250	NiZn	Frequency < 300MHz
4S60	2000	260	≥ 100	NiZn	Frequency < 50MHz

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