Passive Components – Mouser United Kingdom

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EMI Cores

KEMET EMI Cores provide high-frequency noise suppression in electronic circuits. There are two ferrite material options for KEMET EMI Cores, namely Nickel-Zinc (NiZn) and Manganese Zinc (MnZn). The NiZn core material is typically effective for theMHz band range (FM-band frequencies), whereas the MnZn core material is typically effective for the kHz band range (AM-band frequencies). The MnZn core material offers a lower resistance compared to the NiZn and hence adequate insulation is required before use (recommended to measure the actual frequency-range effectiveness in the target application). The effective frequency range varies depending on core shape, size, and the number of turns.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (GBP) Filter the results in the table by unit price based on your quantity.	Qty.
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 17.9mm ESD-R-38D-B KEMET 1: £7.41 1,691In Stock	Mfr. Part No. ESD-R-38D-B Mouser Part No 80-ESD-R-38D-B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 17.9mm Learn More about KEMET emi cores	Datasheet	1,691In Stock	£7.41 £5.28 £4.43 £3.83 £3.59	Min.: 1 Mult.: 1
Ferrite Clamp On Cores 53x19mm 10MHz Mn-Zn 85C ESD-SR-S47M KEMET 1: £10.84 372In Stock	Mfr. Part No. ESD-SR-S47M Mouser Part No 80-ESD-SR-S47M	KEMET	Ferrite Clamp On Cores 53x19mm 10MHz Mn-Zn 85C Learn More about KEMET emi cores	Datasheet	372In Stock	£10.84 £6.08 £5.26	Min.: 1 Mult.: 1
Ferrite Clamp On Cores 6x21x16.5mm Ni-Zn 65C ESD-SR-100 KEMET 1: £1.73 3,385In Stock 2,070Expected 25/12/2026	Mfr. Part No. ESD-SR-100 Mouser Part No 80-ESD-SR-100	KEMET	Ferrite Clamp On Cores 6x21x16.5mm Ni-Zn 65C Learn More about KEMET emi cores	Datasheet	3,385In Stock 2,070Expected 25/12/2026	£1.73 £1.14 £1.04 £1.02 View £0.882 £0.811 £0.667 £0.666	Min.: 1 Mult.: 1
Ferrite Cable Cores Ferrite Bead Core EMI 1mm B-20L-25 KEMET 1: £0.142 52,517In Stock	Mfr. Part No. B-20L-25 Mouser Part No 80-B-20L-25	KEMET	Ferrite Cable Cores Ferrite Bead Core EMI 1mm Learn More about KEMET Kemet EMI Cores	Datasheet	52,517In Stock	£0.142 £0.104 £0.087 £0.078 View £0.072 £0.067 £0.058	Min.: 1 Mult.: 1
Ferrite Cable Cores Ferrite Bead Core EMI 1.6mm B-20L-44 KEMET 1: £0.12 47,031In Stock	Mfr. Part No. B-20L-44 Mouser Part No 80-B-20L-44	KEMET	Ferrite Cable Cores Ferrite Bead Core EMI 1.6mm Learn More about KEMET Kemet EMI Cores	Datasheet	47,031In Stock	£0.12 £0.094 £0.083 £0.078 View £0.072 £0.069 £0.062 £0.054	Min.: 1 Mult.: 1
Ferrite Cable Cores 56x2mm Split Core Ni-Zn for Flat Cable ESD-FPD-40-1 KEMET 1: £7.36 339In Stock	Mfr. Part No. ESD-FPD-40-1 Mouser Part No 80-ESD-FPD-40-1	KEMET	Ferrite Cable Cores 56x2mm Split Core Ni-Zn for Flat Cable Learn More about KEMET emi cores	Datasheet	339In Stock	£7.36 £4.96 £4.16 £3.60 £3.32	Min.: 1 Mult.: 1
Ferrite Clamp On Cores 6x18.5x14mm Ni-Zn 65C ESD-SR-S10 KEMET 1: £2.00 6,146In Stock	Mfr. Part No. ESD-SR-S10 Mouser Part No 80-ESD-SR-S10	KEMET	Ferrite Clamp On Cores 6x18.5x14mm Ni-Zn 65C Learn More about KEMET emi cores	Datasheet	6,146In Stock	£2.00 £1.33 £1.13 £1.00 View £0.882 £0.766 £0.696 £0.684	Min.: 1 Mult.: 1
Ferrite Cable Cores Ferrite Bead Core EMI 0.8mm B-20L-34 KEMET 1: £0.263 27,395In Stock	Mfr. Part No. B-20L-34 Mouser Part No 80-B-20L-34	KEMET	Ferrite Cable Cores Ferrite Bead Core EMI 0.8mm Learn More about KEMET Kemet EMI Cores	Datasheet	27,395In Stock	£0.263 £0.184 £0.142 £0.127 View £0.108 £0.088 £0.079 £0.067	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 6mm ESD-R-12D KEMET 1: £1.53 1,895In Stock	Mfr. Part No. ESD-R-12D Mouser Part No 80-ESD-R-12D	KEMET	Ferrite Toroids / Ferrite Rings 6mm Learn More about KEMET emi cores	Datasheet	1,895In Stock	£1.53 £1.05 £0.908 £0.803 View £0.702 £0.582 £0.526	Min.: 1 Mult.: 1
Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C ESD-SR-160 KEMET 1: £3.17 5,314In Stock	Mfr. Part No. ESD-SR-160 Mouser Part No 80-ESD-SR-160	KEMET	Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C Learn More about KEMET emi cores	Datasheet	5,314In Stock	£3.17 £2.24 £1.93 £1.69 View £1.47 £1.34 £1.23 £1.21	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 8.8mm ESD-R-19B KEMET 1: £2.14 672In Stock	Mfr. Part No. ESD-R-19B Mouser Part No 80-ESD-R-19B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 8.8mm Learn More about KEMET emi cores	Datasheet	672In Stock	£2.14 £1.48 £1.26 £1.11 View £0.969 £0.803 £0.78	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 15x5x9mm 10MHz Mn-Zn 120C ESD-R-12M-H KEMET 1: £1.07 2,486In Stock	Mfr. Part No. ESD-R-12M-H Mouser Part No 80-ESD-R-12M-H	KEMET	Ferrite Toroids / Ferrite Rings 15x5x9mm 10MHz Mn-Zn 120C Learn More about KEMET emi cores	Datasheet	2,486In Stock	£1.07 £0.716 £0.628 £0.56 View £0.502 £0.416 £0.383 £0.355	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 6.2mm ESD-R-14A KEMET 1: £0.646 4,679In Stock	Mfr. Part No. ESD-R-14A Mouser Part No 80-ESD-R-14A	KEMET	Ferrite Toroids / Ferrite Rings 6.2mm Learn More about KEMET emi cores	Datasheet	4,679In Stock	£0.646 £0.45 £0.388 £0.346 View £0.306 £0.258 £0.217 £0.197 £0.193	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 48.5x26x16mm Mn-Zn Coated ESD-R-47-P KEMET 1: £9.56 188In Stock	Mfr. Part No. ESD-R-47-P Mouser Part No 80-ESD-R-47-P	KEMET	Ferrite Toroids / Ferrite Rings 48.5x26x16mm Mn-Zn Coated Learn More about KEMET emi cores	Datasheet	188In Stock	£9.56 £6.00 £5.09 £4.57 View £4.47 £4.36	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 19x10.7x5.3mm Ni-Zn Coated ESD-R-19E-1 KEMET 1: £2.93 603In Stock	Mfr. Part No. ESD-R-19E-1 Mouser Part No 80-ESD-R-19E-1	KEMET	Ferrite Toroids / Ferrite Rings 19x10.7x5.3mm Ni-Zn Coated Learn More about KEMET emi cores	Datasheet	603In Stock	£2.93 £2.01 £1.71 £1.37 View £1.17 £1.13	Min.: 1 Mult.: 1
Ferrite Clamp On Cores 31.5x13x38mm Ni-Zn Snap-on ESD-SR-250G KEMET 1: £6.39 241In Stock	Mfr. Part No. ESD-SR-250G Mouser Part No 80-ESD-SR-250G	KEMET	Ferrite Clamp On Cores 31.5x13x38mm Ni-Zn Snap-on Learn More about KEMET emi cores	Datasheet	241In Stock	£6.39 £4.31 £3.62 £3.03 View £2.87 £2.80	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 29x12.7x16mm 300MHz Ni-Zn 120C ESD-R-25N-H KEMET 1: £2.58 928In Stock	Mfr. Part No. ESD-R-25N-H Mouser Part No 80-ESD-R-25N-H	KEMET	Ferrite Toroids / Ferrite Rings 29x12.7x16mm 300MHz Ni-Zn 120C Learn More about KEMET emi cores	Datasheet	928In Stock	£2.58 £1.78 £1.51 £1.32 View £1.15 £0.978 £0.969	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 10.5mm ESD-R-15C KEMET 1: £0.986 38In Stock 800Expected 13/04/2027	Mfr. Part No. ESD-R-15C Mouser Part No 80-ESD-R-15C	KEMET	Ferrite Toroids / Ferrite Rings 10.5mm Learn More about KEMET emi cores	Datasheet	38In Stock 800Expected 13/04/2027	£0.986 £0.684 £0.585 £0.518 View £0.447 £0.374 £0.353 £0.335	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings 61x33.2x25mm 300MHz Ni-Zn 120C ESD-R-57N-H KEMET 1: £16.53 57In Stock	Mfr. Part No. ESD-R-57N-H Mouser Part No 80-ESD-R-57N-H	KEMET	Ferrite Toroids / Ferrite Rings 61x33.2x25mm 300MHz Ni-Zn 120C Learn More about KEMET emi cores	Datasheet	57In Stock	£16.53 £10.23 £8.88 £8.63	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1 ESD-R-220814XH-R1 KEMET 1: £1.70 602In Stock	Mfr. Part No. ESD-R-220814XH-R1 Mouser Part No 80-ESD-R-220814XH-R1	KEMET	Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1 Learn More about KEMET emi cores	Datasheet	602In Stock	£1.70 £1.17 £1.00 £0.882 View £0.773 £0.657	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings Bare,Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability 10H ESD-R-25SH KEMET 1: £1.91 680In Stock	Mfr. Part No. ESD-R-25SH Mouser Part No 80-ESD-R-25SH	KEMET	Ferrite Toroids / Ferrite Rings Bare,Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability 10H Learn More about KEMET emi cores	Datasheet	680In Stock	£1.91 £1.32 £1.13 £0.995 View £0.943 £0.871 £0.863	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings Toroidal,Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H ESD-R-25SR KEMET 1: £3.39 200In Stock	Mfr. Part No. ESD-R-25SR Mouser Part No 80-ESD-R-25SR	KEMET	Ferrite Toroids / Ferrite Rings Toroidal,Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H Learn More about KEMET emi cores	Datasheet	200In Stock	£3.39 £2.32 £1.96 £1.73 View £1.49 £1.48	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings Coated Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H ESD-R-25SR-P KEMET 1: £4.29 76In Stock	Mfr. Part No. ESD-R-25SR-P Mouser Part No 80-ESD-R-25SR-P	KEMET	Ferrite Toroids / Ferrite Rings Coated Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H Learn More about KEMET emi cores	Datasheet	76In Stock	£4.29 £2.92 £2.47 £2.21 View £2.18 £2.17	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1 ESD-R-291216XH-R1 KEMET 1: £2.40 319In Stock	Mfr. Part No. ESD-R-291216XH-R1 Mouser Part No 80-ESD-R-291216XH-R1	KEMET	Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1 Learn More about KEMET emi cores	Datasheet	319In Stock	£2.40 £1.66 £1.41 £1.24 View £1.08 £0.986	Min.: 1 Mult.: 1
Ferrite Toroids / Ferrite Rings Toroidal w/case Nanocrystal Low Frequency 150kHz Ring -40/+120C UL94 V-0 ESD-R-412119H-NC23 KEMET 1: £13.35 66In Stock 120Expected 27/04/2027	Mfr. Part No. ESD-R-412119H-NC23 Mouser Part No 80-ESD-R-412119HNC23	KEMET	Ferrite Toroids / Ferrite Rings Toroidal w/case Nanocrystal Low Frequency 150kHz Ring -40/+120C UL94 V-0 Learn More about KEMET emi cores	Datasheet	66In Stock 120Expected 27/04/2027	£13.35 £8.82 £8.31 £8.30	Min.: 1 Mult.: 1

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EMI Cores

Types of Passive Components