Ferrites – 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.	Product Type	Product
Ferrite Toroids / Ferrite Rings 10.5mm ESD-R-15C-1 KEMET 1: £0.646 10In Stock 800Expected 21/04/2027	Mfr. Part No. ESD-R-15C-1 Mouser Part No 80-ESD-R-15C-1	KEMET	Ferrite Toroids / Ferrite Rings 10.5mm Learn More about KEMET emi cores	Datasheet	10In Stock 800Expected 21/04/2027	£0.646 £0.449 £0.388 £0.345 View £0.305 £0.257 £0.211	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 11.6mm ESD-R-16 KEMET 1: £0.818 1,032In Stock	Mfr. Part No. ESD-R-16 Mouser Part No 80-ESD-R-16	KEMET	Ferrite Toroids / Ferrite Rings 11.6mm Learn More about KEMET emi cores	Datasheet	1,032In Stock	£0.818 £0.564 £0.483 £0.428 View £0.385 £0.316 £0.297 £0.28 £0.267	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 22x7.7x14mm 10MHz Mn-Zn 120C ESD-R-19M-H KEMET 1: £1.87 380In Stock	Mfr. Part No. ESD-R-19M-H Mouser Part No 80-ESD-R-19M-H	KEMET	Ferrite Toroids / Ferrite Rings 22x7.7x14mm 10MHz Mn-Zn 120C Learn More about KEMET emi cores	Datasheet	380In Stock	£1.87 £1.28 £1.10 £0.89 View £0.766 £0.715	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 14mm ESD-R-25 KEMET 1: £1.79 300In Stock	Mfr. Part No. ESD-R-25 Mouser Part No 80-ESD-R-25	KEMET	Ferrite Toroids / Ferrite Rings 14mm Learn More about KEMET emi cores	Datasheet	300In Stock	£1.79 £1.20 £1.03 £0.908 View £0.796 £0.661	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm ESD-R-25B KEMET 1: £1.98 490In Stock	Mfr. Part No. ESD-R-25B Mouser Part No 80-ESD-R-25B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm Learn More about KEMET emi cores	Datasheet	490In Stock	£1.98 £1.37 £1.16 £1.03 View £0.899 £0.788	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 15mm ESD-R-25D-8 KEMET 1: £2.03 227In Stock 173Expected 04/01/2027	Mfr. Part No. ESD-R-25D-8 Mouser Part No 80-ESD-R-25D-8	KEMET	Ferrite Toroids / Ferrite Rings 15mm Learn More about KEMET emi cores	Datasheet	227In Stock 173Expected 04/01/2027	£2.03 £1.41 £1.20 £1.06 View £0.925 £0.796	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 29x12.7x16mm 10MHz Mn-Zn 120C ESD-R-25M-H KEMET 1: £2.58 240In Stock	Mfr. Part No. ESD-R-25M-H Mouser Part No 80-ESD-R-25M-H	KEMET	Ferrite Toroids / Ferrite Rings 29x12.7x16mm 10MHz Mn-Zn 120C Learn More about KEMET emi cores	Datasheet	240In Stock	£2.58 £1.78 £1.51 £1.32 View £1.15 £1.07	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 15mm ESD-R-25S KEMET 1: £1.78 245In Stock	Mfr. Part No. ESD-R-25S Mouser Part No 80-ESD-R-25S	KEMET	Ferrite Toroids / Ferrite Rings 15mm Learn More about KEMET emi cores	Datasheet	245In Stock	£1.78 £1.19 £1.01 £0.978 View £0.856 £0.67	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 27x19x15mm Mn-Zn Coated ESD-R-27S KEMET 1: £1.87 325In Stock	Mfr. Part No. ESD-R-27S Mouser Part No 80-ESD-R-27S	KEMET	Ferrite Toroids / Ferrite Rings 27x19x15mm Mn-Zn Coated Learn More about KEMET emi cores	Datasheet	325In Stock	£1.87 £1.29 £1.10 £0.969 View £0.849 £0.826 £0.732	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 16mm ESD-R-28C KEMET 1: £1.99 561In Stock	Mfr. Part No. ESD-R-28C Mouser Part No 80-ESD-R-28C	KEMET	Ferrite Toroids / Ferrite Rings 16mm Learn More about KEMET emi cores	Datasheet	561In Stock	£1.99 £1.37 £1.17 £1.03 View £0.899 £0.777	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 15.8mm ESD-R-28C-1 KEMET 1: £2.43 377In Stock	Mfr. Part No. ESD-R-28C-1 Mouser Part No 80-ESD-R-28C-1	KEMET	Ferrite Toroids / Ferrite Rings 15.8mm Learn More about KEMET emi cores	Datasheet	377In Stock	£2.43 £1.68 £1.42 £1.26 View £1.10 £0.969	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 32x19x15.8mm Mn-Zn Coated ESD-R-31-P KEMET 1: £3.67 270In Stock	Mfr. Part No. ESD-R-31-P Mouser Part No 80-ESD-R-31-P	KEMET	Ferrite Toroids / Ferrite Rings 32x19x15.8mm Mn-Zn Coated Learn More about KEMET emi cores	Datasheet	270In Stock	£3.67 £2.51 £2.12 £1.85 £1.62	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 31x20x14.9mm 150kHz Mn-Zn 85C ESD-R-31SR KEMET 1: £2.82 22In Stock 300Expected 01/02/2027	Mfr. Part No. ESD-R-31SR Mouser Part No 80-ESD-R-31SR	KEMET	Ferrite Toroids / Ferrite Rings 31x20x14.9mm 150kHz Mn-Zn 85C Learn More about KEMET emi cores	Datasheet	22In Stock 300Expected 01/02/2027	£2.82 £1.94 £1.65 £1.44 View £1.27 £1.26	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	EMI Cores
Ferrite Toroids / Ferrite Rings 17.5mm ESD-R-38 KEMET 1: £3.60 137In Stock	Mfr. Part No. ESD-R-38 Mouser Part No 80-ESD-R-38	KEMET	Ferrite Toroids / Ferrite Rings 17.5mm Learn More about KEMET emi cores	Datasheet	137In Stock	£3.60 £2.46 £1.90 £1.65 £1.58	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 39x17.5x14mm Mn-Zn Case and Tape ESD-R-38-1 KEMET 1: £5.40 63In Stock	Mfr. Part No. ESD-R-38-1 Mouser Part No 80-ESD-R-38-1	KEMET	Ferrite Toroids / Ferrite Rings 39x17.5x14mm Mn-Zn Case and Tape Learn More about KEMET emi cores	Datasheet	63In Stock	£5.40 £3.67 £2.81 £2.54	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 17.9mm ESD-R-38B KEMET 1: £4.03 222In Stock	Mfr. Part No. ESD-R-38B Mouser Part No 80-ESD-R-38B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 17.9mm Learn More about KEMET emi cores	Datasheet	222In Stock	£4.03 £2.75 £2.33 £2.03 View £1.82 £1.80	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 17.5mm ESD-R-38C-1 KEMET 1: £5.79 165In Stock	Mfr. Part No. ESD-R-38C-1 Mouser Part No 80-ESD-R-38C-1	KEMET	Ferrite Toroids / Ferrite Rings 17.5mm Learn More about KEMET emi cores	Datasheet	165In Stock	£5.79 £3.93 £3.34 £2.89 £2.68	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 19mm ESD-R-38D KEMET 1: £3.47 150In Stock	Mfr. Part No. ESD-R-38D Mouser Part No 80-ESD-R-38D	KEMET	Ferrite Toroids / Ferrite Rings 19mm Learn More about KEMET emi cores	Datasheet	150In Stock	£3.47 £2.38 £2.02 £1.76 £1.42	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 42x16.7x17mm 10MHz Mn-Zn 120C ESD-R-38M-H KEMET 1: £4.14 170In Stock	Mfr. Part No. ESD-R-38M-H Mouser Part No 80-ESD-R-38M-H	KEMET	Ferrite Toroids / Ferrite Rings 42x16.7x17mm 10MHz Mn-Zn 120C Learn More about KEMET emi cores	Datasheet	170In Stock	£4.14 £2.90 £2.23	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 42x16.7x17mm 300MHz Ni-Zn 120C ESD-R-38N-H KEMET 1: £4.66 69In Stock	Mfr. Part No. ESD-R-38N-H Mouser Part No 80-ESD-R-38N-H	KEMET	Ferrite Toroids / Ferrite Rings 42x16.7x17mm 300MHz Ni-Zn 120C Learn More about KEMET emi cores	Datasheet	69In Stock	£4.66 £3.18 £2.44 £2.14	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 39x17.5x14mm Mn-Zn Case ESD-R-38SA KEMET 1: £3.67 63In Stock	Mfr. Part No. ESD-R-38SA Mouser Part No 80-ESD-R-38SA	KEMET	Ferrite Toroids / Ferrite Rings 39x17.5x14mm Mn-Zn Case Learn More about KEMET emi cores	Datasheet	63In Stock	£3.67 £2.51 £1.95 £1.68 £1.62	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 38x19x12.7mm 150kHz Mn-Zn 85C ESD-R-38SR KEMET 1: £4.85 137In Stock	Mfr. Part No. ESD-R-38SR Mouser Part No 80-ESD-R-38SR	KEMET	Ferrite Toroids / Ferrite Rings 38x19x12.7mm 150kHz Mn-Zn 85C Learn More about KEMET emi cores	Datasheet	137In Stock	£4.85 £3.30 £2.55 £2.24	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	EMI Cores
Ferrite Toroids / Ferrite Rings 50x23x18mm Mn-Zn Case and Tape ESD-R-47-1 KEMET 1: £7.48 155In Stock 20Expected 06/11/2026	Mfr. Part No. ESD-R-47-1 Mouser Part No 80-ESD-R-47-1	KEMET	Ferrite Toroids / Ferrite Rings 50x23x18mm Mn-Zn Case and Tape Learn More about KEMET emi cores	Datasheet	155In Stock 20Expected 06/11/2026	£7.48 £5.04 £4.23 £3.70 £3.63	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 25.5mm ESD-R-47D-1 KEMET 1: £7.33 171In Stock	Mfr. Part No. ESD-R-47D-1 Mouser Part No 80-ESD-R-47D-1	KEMET	Ferrite Toroids / Ferrite Rings 25.5mm Learn More about KEMET emi cores	Datasheet	171In Stock	£7.33 £4.94 £4.14 £3.63	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm ESD-R-47D-B KEMET 1: £9.66 113In Stock 180Expected 24/12/2026	Mfr. Part No. ESD-R-47D-B Mouser Part No 80-ESD-R-47D-B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm Learn More about KEMET emi cores	Datasheet	113In Stock 180Expected 24/12/2026	£9.66 £6.45 £5.38 £5.02	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids

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