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 19mm ESD-R-31C KEMET 1: £1.76 1,200On Order	Mfr. Part No. ESD-R-31C Mouser Part No 80-ESD-R-31C	KEMET	Ferrite Toroids / Ferrite Rings 19mm Learn More about KEMET emi cores	Datasheet	1,200On Order On Order Ship Dates Mfr. No: ESD-R-31C Stock: 0 On Order: 300 Expected 21/01/2027 900 Expected 26/02/2027 Factory Lead Time: 23 Weeks	£1.76 £1.05 £0.925 £0.78 View £0.716 £0.684	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 48.5x26x16mm Mn-Zn Coated ESD-R-47-P KEMET 1: £9.28 188Expected 15/10/2026	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	188Expected 15/10/2026	£9.28 £5.60 £5.59 £5.27 View £5.09 £4.91 £4.79	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm ESD-R-47B KEMET 1: £6.33 200On Order	Mfr. Part No. ESD-R-47B Mouser Part No 80-ESD-R-47B	KEMET	Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm Learn More about KEMET emi cores	Datasheet	200On Order On Order Ship Dates Mfr. No: ESD-R-47B Stock: 0 On Order: 110 Expected 09/11/2026 90 Expected 26/11/2026 Factory Lead Time: 23 Weeks	£6.33 £4.00 £3.87 £3.78 View £3.74 Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 47x27x15mm 150kHz Mn-Zn 85C ESD-R-47SR KEMET 1: £9.73 100Expected 21/01/2027	Mfr. Part No. ESD-R-47SR Mouser Part No 80-ESD-R-47SR	KEMET	Ferrite Toroids / Ferrite Rings 47x27x15mm 150kHz Mn-Zn 85C Learn More about KEMET emi cores	Datasheet	100Expected 21/01/2027	£9.73 £6.11 £6.03 £5.69 View £5.52 £5.36 Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	EMI Cores
Ferrite Toroids / Ferrite Rings 57x36x20mm Ni-Zn Bare ESD-R-57D KEMET 1: £23.27 20Expected 25/03/2027	Mfr. Part No. ESD-R-57D Mouser Part No 80-ESD-R-57D	KEMET	Ferrite Toroids / Ferrite Rings 57x36x20mm Ni-Zn Bare Learn More about KEMET emi cores	Datasheet	20Expected 25/03/2027	£23.27 £15.44 £14.46 £14.13 Quote Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 32.4mm ESD-R-57D-1 KEMET 1: £21.87 31Expected 25/03/2027	Mfr. Part No. ESD-R-57D-1 Mouser Part No 80-ESD-R-57D-1	KEMET	Ferrite Toroids / Ferrite Rings 32.4mm Learn More about KEMET emi cores	Datasheet	31Expected 25/03/2027	£21.87 £15.47 £14.66 £13.98 View £13.47 Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Clamp On Cores Mn-Zn HR1 Round Snap On 500MHz 85C 6x21x16.5x16.5mm ESD-SR-160620X-R1 KEMET 1: £1.69 900Expected 24/12/2026	Mfr. Part No. ESD-SR-160620X-R1 Mouser Part No 80-ESD-SR-160620X-R1	KEMET	Ferrite Clamp On Cores Mn-Zn HR1 Round Snap On 500MHz 85C 6x21x16.5x16.5mm Learn More about KEMET emi cores	Datasheet	900Expected 24/12/2026	£1.69 £1.00 £0.882 £0.766 £0.759	Min.: 1 Mult.: 1	Ferrite Clamp On Cores	EMI Cores
Ferrite Clamp On Cores 19.5x46.5x19.5mm 300MHz Ni-Zn 100C ESD-SR-160H KEMET 1: £4.50 410On Order	Mfr. Part No. ESD-SR-160H Mouser Part No 80-ESD-SR-160H	KEMET	Ferrite Clamp On Cores 19.5x46.5x19.5mm 300MHz Ni-Zn 100C Learn More about KEMET emi cores	Datasheet	410On Order On Order Ship Dates Mfr. No: ESD-SR-160H Stock: 0 On Order: 200 Expected 09/11/2026 210 Expected 25/02/2027 Factory Lead Time: 23 Weeks	£4.50 £2.59 £2.26 £2.25 View £2.17 £2.11 £2.05	Min.: 1 Mult.: 1	Ferrite Clamp On Cores	EMI, Split Snap-In Cores
Ferrite Cable Cores 4.8x2.4mm 300MHz Ni-Zn Coated B-20L-48B-A KEMET 30,000: £0.519 Non-Stocked Lead-Time 29 Weeks	Mfr. Part No. B-20L-48B-A Mouser Part No 80-B-20L-48B-A	KEMET	Ferrite Cable Cores 4.8x2.4mm 300MHz Ni-Zn Coated Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 29 Weeks	£0.519	Min.: 30,000 Mult.: 5,000	Ferrite Cable Cores	Round Cable Cores Solid
Ferrite Cable Cores Split Core Flat 56mm Cable ESD-FPD-40 KEMET 1: £6.97 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-FPD-40 Mouser Part No 80-ESD-FPD-40	KEMET	Ferrite Cable Cores Split Core Flat 56mm Cable Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£6.97 £4.11 £3.57 £3.51 £3.35	Min.: 1 Mult.: 1	Ferrite Cable Cores	Flat Ribbon Cable Cores Split
Ferrite Toroids / Ferrite Rings 9mm ESD-R-19 KEMET 1: £1.34 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-19 Mouser Part No 80-ESD-R-19	KEMET	Ferrite Toroids / Ferrite Rings 9mm Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£1.34 £0.803 £0.705 £0.54 View £0.519 £0.496 £0.477 £0.467 £0.464	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 26x14x15mm Ni-Zn Case and Tape ESD-R-25D-1 KEMET 1: £1.96 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-25D-1 Mouser Part No 80-ESD-R-25D-1	KEMET	Ferrite Toroids / Ferrite Rings 26x14x15mm Ni-Zn Case and Tape Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£1.96 £1.15 £1.01 £0.89 View £0.882 £0.803 £0.773	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 25.3x14.8x12.3mm Mn-Zn Coated ESD-R-25MK KEMET 1: £2.58 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-25MK Mouser Part No 80-ESD-R-25MK	KEMET	Ferrite Toroids / Ferrite Rings 25.3x14.8x12.3mm Mn-Zn Coated Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£2.58 £1.51 £1.33 £1.24 View £1.21 £1.14 £1.12 £1.10 Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 51x24.4x19mm 300MHz Ni-Zn 120C ESD-R-47N-H KEMET 1: £7.25 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-47N-H Mouser Part No 80-ESD-R-47N-H	KEMET	Ferrite Toroids / Ferrite Rings 51x24.4x19mm 300MHz Ni-Zn 120C Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£7.25 £4.12 £3.76 £3.57 View £3.43 Quote	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 59x34x21mm Mn-Zn Coated ESD-R-57-P KEMET 1: £14.83 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-57-P Mouser Part No 80-ESD-R-57-P	KEMET	Ferrite Toroids / Ferrite Rings 59x34x21mm Mn-Zn Coated Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£14.83 £11.58 £9.25	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 61x33.2x25mm 10MHz Mn-Zn 120C ESD-R-57M-H KEMET 1: £16.06 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-57M-H Mouser Part No 80-ESD-R-57M-H	KEMET	Ferrite Toroids / Ferrite Rings 61x33.2x25mm 10MHz Mn-Zn 120C Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£16.06 £10.54 £9.34 £9.18	Min.: 1 Mult.: 1	Ferrite Toroids / Ferrite Rings	Toroids
Ferrite Toroids / Ferrite Rings 57x36x20mm 150kHz Mn-Zn 85C ESD-R-57SR KEMET 60: £11.87 Non-Stocked Lead-Time 23 Weeks	Mfr. Part No. ESD-R-57SR Mouser Part No 80-ESD-R-57SR	KEMET	Ferrite Toroids / Ferrite Rings 57x36x20mm 150kHz Mn-Zn 85C Learn More about KEMET emi cores	Datasheet	Non-Stocked Lead-Time 23 Weeks	£11.87 £11.59 Quote Quote	Min.: 60 Mult.: 15	Ferrite Toroids / Ferrite Rings	EMI Cores

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