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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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Types of Passive Components

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Part #

Ferrite Toroids / Ferrite Rings 32x19x15.8mm Mn-Zn Coated

ESD-R-31-P
KEMET
1: Rp85.309
355In 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

Datasheet

355In Stock

Rp85.309

Rp49.351

Rp43.113

Rp34.307

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 15x5x9mm 10MHz Mn-Zn 120C

ESD-R-12M-H
KEMET
1: Rp24.767
2.500In 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

Datasheet

2.500In Stock

Rp24.767

Rp13.136

Rp9.301

Rp8.458

Rp8.127

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 61x33.2x25mm 300MHz Ni-Zn 120C

ESD-R-57N-H
KEMET
1: Rp385.083
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

Datasheet

57In Stock

Rp385.083

Rp203.090

Rp202.907

View

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: Rp93.198
594In 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

594In Stock

Rp93.198

Rp47.700

Rp43.847

Rp43.663

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: Rp332.796
212In Stock

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

212In Stock

Rp332.796

Rp254.642

Rp205.842

Rp197.953

Rp190.615

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: Rp39.627
627In 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

627In Stock

Rp39.627

Rp22.566

Rp19.080

Rp15.741

View

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: Rp50.635
692In 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

692In Stock

Rp50.635

Rp35.958

Rp27.336

Rp24.217

View

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: Rp78.888
143In Stock
300Expected 23/07/2026

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

143In Stock

300Expected 23/07/2026

Rp78.888

Rp45.865

Rp40.178

Rp34.857

Rp31.372

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: Rp49.901
334In 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

334In Stock

Rp49.901

Rp29.170

Rp25.684

Rp21.098

Rp20.914

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-421617XH-R1
KEMET
1: Rp101.086
236In Stock

Mfr. Part No.
ESD-R-421617XH-R1

Mouser Part No
80-ESD-R-421617XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

236In Stock

Rp101.086

Rp53.203

Rp46.048

Rp42.196

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal,Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-512419XH-R1
KEMET
1: Rp142.548
118In Stock

Mfr. Part No.
ESD-R-512419XH-R1

Mouser Part No
80-ESD-R-512419XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal,Mn-Zn -40/+120C UL94 V-0 HR1

118In Stock

Rp142.548

Rp73.751

Rp65.312

Rp65.128

Rp62.743

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-613325XH-R1
KEMET
1: Rp358.848
71In Stock

Mfr. Part No.
ESD-R-613325XH-R1

Mouser Part No
80-ESD-R-613325XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

71In Stock

Rp358.848

Rp187.496

Rp187.313

Rp186.579

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-130527X-R1
KEMET
1: Rp47.700
1.297In Stock

Mfr. Part No.
ESD-SR-130527X-R1

Mouser Part No
80-ESD-SR-130527X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

1.297In Stock

Rp47.700

Rp25.868

Rp22.199

Rp22.015

Rp17.392

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-150632X-R1
KEMET
1: Rp51.736
1.020In Stock

Mfr. Part No.
ESD-SR-150632X-R1

Mouser Part No
80-ESD-SR-150632X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

1.020In Stock

Rp51.736

Rp30.454

Rp25.134

Rp21.832

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-160620X-R1
KEMET
1: Rp39.444
710In Stock

Mfr. Part No.
ESD-SR-160620X-R1

Mouser Part No
80-ESD-SR-160620X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

710In Stock

Rp39.444

Rp22.382

Rp18.529

Rp16.016

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-311337X-R1
KEMET
1: Rp141.448
43In Stock

Mfr. Part No.
ESD-SR-311337X-R1

Mouser Part No
80-ESD-SR-311337X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

43In Stock

Rp141.448

Rp73.201

Rp71.733

Rp69.531

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 1mm

B-20L-25
KEMET
1: Rp4.770
54.088In Stock

Mfr. Part No.
B-20L-25

Mouser Part No
80-B-20L-25

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 1mm

Datasheet

54.088In Stock

Rp4.770

Rp2.899

Rp2.220

Rp1.945

View

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 2.4mm

B-20L-48B
KEMET
1: Rp7.522
45.098In Stock

Mfr. Part No.
B-20L-48B

Mouser Part No
80-B-20L-48B

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 2.4mm

Datasheet

45.098In Stock

Rp7.522

Rp4.935

Rp2.532

Rp2.165

View

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 4.8mm

B-20L-95B
KEMET
1: Rp12.842
10.587In Stock

Mfr. Part No.
B-20L-95B

Mouser Part No
80-B-20L-95B

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 4.8mm

Datasheet

10.587In Stock

Rp12.842

Rp6.421

Rp4.660

Rp3.816

Rp3.798

Min.: 1
Mult.: 1

Ferrite Cable Cores 14x1mm Bare Ni-Zn for Flat Cable

ESD-FPL-18-8
KEMET
1: Rp68.247
1.235In Stock

Mfr. Part No.
ESD-FPL-18-8

Mouser Part No
80-ESD-FPL-18-8

KEMET

Ferrite Cable Cores 14x1mm Bare Ni-Zn for Flat Cable

Datasheet

1.235In Stock

Rp68.247

Rp49.167

Rp37.609

Rp33.573

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 5mm

ESD-R-10D
KEMET
1: Rp8.806
12.175In Stock

Mfr. Part No.
ESD-R-10D

Mouser Part No
80-ESD-R-10D

KEMET

Ferrite Toroids / Ferrite Rings 5mm

Datasheet

12.175In Stock

Rp8.806

Rp4.880

Rp3.981

Rp3.486

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 25.5mm

ESD-R-47D-1
KEMET
1: Rp170.801
335In Stock

Mfr. Part No.
ESD-R-47D-1

Mouser Part No
80-ESD-R-47D-1

KEMET

Ferrite Toroids / Ferrite Rings 25.5mm

Datasheet

335In Stock

Rp170.801

Rp96.317

Rp83.474

Rp77.604

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

ESD-R-47D-B
KEMET
1: Rp224.739
238In Stock

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

Datasheet

238In Stock

Rp224.739

Rp125.120

Rp122.735

Rp107.324

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C

ESD-SR-160
KEMET
1: Rp76.686
1.896In Stock

Mfr. Part No.
ESD-SR-160

Mouser Part No
80-ESD-SR-160

KEMET

Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C

Datasheet

1.896In Stock

Rp76.686

Rp44.397

Rp37.976

Rp37.793

View

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 8x20.5x20mm Ni-Zn 65C

ESD-SR-S16
KEMET
1: Rp61.826
2.796In Stock
1.960Expected 27/04/2026

Mfr. Part No.
ESD-SR-S16

Mouser Part No
80-ESD-SR-S16

KEMET

Ferrite Clamp On Cores 8x20.5x20mm Ni-Zn 65C

Datasheet

2.796In Stock

1.960Expected 27/04/2026

Rp61.826

Rp31.739

Rp23.666

Rp23.483

Min.: 1
Mult.: 1