Ferrite Toroids / Ferrite Rings

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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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Part #

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 17.9mm

ESD-R-38D-B
KEMET
1: $13.87
1,723Expected 28/5/2026

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

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Datasheet

1,723Expected 28/5/2026

$13.87

$6.74

$6.39

$6.38

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

17.9 mm

42.4 mm

16 mm

ESD-R-B

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 25.5mm

ESD-R-47
KEMET
1: $8.85
1,120On Order

Mfr. Part No.
ESD-R-47

Mouser Part No
80-ESD-R-47

KEMET

Ferrite Toroids / Ferrite Rings 25.5mm

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Datasheet

1,120On Order

$8.85

$4.64

$4.27

$3.79

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

25.5 mm

48 mm

16 mm

ESD-R

Bulk

Manganese Zinc (MnZn)

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

ESD-SR-190938X-R1
KEMET
1: $5.53
797On Order

Mfr. Part No.
ESD-SR-190938X-R1

Mouser Part No
80-ESD-SR-190938X-R1

KEMET

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

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797On Order

$5.53

$3.98

$3.45

$3.04

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

EMI Cores

9 mm

20.2 mm

39 mm

ESD-SR-190938X-R1

Tray

Manganese Zinc (MnZn) HR1

Ferrite Toroids / Ferrite Rings 7.3mm

ESD-R-12C
KEMET
1: $1.08
2,216Expected 23/7/2026

Mfr. Part No.
ESD-R-12C

Mouser Part No
80-ESD-R-12C

KEMET

Ferrite Toroids / Ferrite Rings 7.3mm

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Datasheet

2,216Expected 23/7/2026

$1.08

$0.733

$0.528

$0.435

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Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

7.3 mm

11.8 mm

15 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 12x7x15mm Ni-Zn Coated

ESD-R-12CM
KEMET
1: $1.95
1,792On Order

Mfr. Part No.
ESD-R-12CM

Mouser Part No
80-ESD-R-12CM

KEMET

Ferrite Toroids / Ferrite Rings 12x7x15mm Ni-Zn Coated

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Datasheet

1,792On Order

$1.95

$1.36

$1.00

$0.837

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

7 mm

12 mm

15 mm

ESD-R

Tray

Nickel Zinc

Ferrite Toroids / Ferrite Rings 7mm

ESD-R-12S
KEMET
1: $1.35
1,500Expected 26/3/2026

Mfr. Part No.
ESD-R-12S

Mouser Part No
80-ESD-R-12S

KEMET

Ferrite Toroids / Ferrite Rings 7mm

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Datasheet

1,500Expected 26/3/2026

$1.35

$0.908

$0.653

$0.539

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

7 mm

12 mm

5.5 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 6.3mm

ESD-R-14S
KEMET
1: $2.21
1,100On Order

Mfr. Part No.
ESD-R-14S

Mouser Part No
80-ESD-R-14S

KEMET

Ferrite Toroids / Ferrite Rings 6.3mm

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Datasheet

1,100On Order

$2.21

$1.54

$1.14

$0.952

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

6.3 mm

14.3 mm

28.5 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 9mm

ESD-R-19
KEMET
1: $2.22
480Expected 23/7/2026

Mfr. Part No.
ESD-R-19

Mouser Part No
80-ESD-R-19

KEMET

Ferrite Toroids / Ferrite Rings 9mm

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Datasheet

480Expected 23/7/2026

$2.22

$1.33

$1.17

$0.751

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

9 mm

19 mm

11 mm

ESD-R

Bulk

Manganese Zinc (MnZn)

Ferrite Toroids / Ferrite Rings 9mm

ESD-R-19D
KEMET
1: $2.65
478Expected 21/5/2026

Mfr. Part No.
ESD-R-19D

Mouser Part No
80-ESD-R-19D

KEMET

Ferrite Toroids / Ferrite Rings 9mm

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Datasheet

478Expected 21/5/2026

$2.65

$1.40

$0.924

$0.923

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

9 mm

19 mm

11 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 10mm

ESD-R-19SD
KEMET
1: $1.40
1,981Expected 4/6/2026

Mfr. Part No.
ESD-R-19SD

Mouser Part No
80-ESD-R-19SD

KEMET

Ferrite Toroids / Ferrite Rings 10mm

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Datasheet

1,981Expected 4/6/2026

$1.40

$0.746

$0.553

$0.48

$0.453

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

10 mm

18.5 mm

10 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm

ESD-R-25D-B
KEMET
1: $3.49
584Expected 26/3/2026

Mfr. Part No.
ESD-R-25D-B

Mouser Part No
80-ESD-R-25D-B

KEMET

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm

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Datasheet

584Expected 26/3/2026

$3.49

$2.06

$1.81

$1.57

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

13.9 mm

29.3 mm

15 mm

ESD-R-B

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 15mm

ESD-R-25SD
KEMET
1: $1.83
2,129On Order

Mfr. Part No.
ESD-R-25SD

Mouser Part No
80-ESD-R-25SD

KEMET

Ferrite Toroids / Ferrite Rings 15mm

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Datasheet

2,129On Order

$1.83

$0.965

$0.71

$0.602

$0.594

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

15 mm

25 mm

12 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 16mm

ESD-R-28C
KEMET
1: $3.50
600Expected 27/7/2026

Mfr. Part No.
ESD-R-28C

Mouser Part No
80-ESD-R-28C

KEMET

Ferrite Toroids / Ferrite Rings 16mm

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Datasheet

600Expected 27/7/2026

$3.50

$1.82

$1.29

$1.24

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

16 mm

28 mm

13 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 19mm

ESD-R-31C
KEMET
1: $3.39
793On Order

Mfr. Part No.
ESD-R-31C

Mouser Part No
80-ESD-R-31C

KEMET

Ferrite Toroids / Ferrite Rings 19mm

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Datasheet

793On Order

$3.39

$2.40

$1.81

$1.60

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

19 mm

31 mm

15 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 32x19.5x9mm Ni-Zn Coated

ESD-R-31C-1
KEMET
1: $5.81
350Expected 23/7/2026

Mfr. Part No.
ESD-R-31C-1

Mouser Part No
80-ESD-R-31C-1

KEMET

Ferrite Toroids / Ferrite Rings 32x19.5x9mm Ni-Zn Coated

Learn More

Datasheet

350Expected 23/7/2026

$5.81

$4.18

$3.61

$3.20

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

19 mm

32 mm

9 mm

ESD-R

Tray

Nickel Zinc

Ferrite Toroids / Ferrite Rings 38x19x12.7mm 150kHz Mn-Zn 85C

ESD-R-38SR
KEMET
1: $8.85
200Expected 23/7/2026

Mfr. Part No.
ESD-R-38SR

Mouser Part No
80-ESD-R-38SR

KEMET

Ferrite Toroids / Ferrite Rings 38x19x12.7mm 150kHz Mn-Zn 85C

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Datasheet

200Expected 23/7/2026

$8.85

$6.53

$5.73

$5.10

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

EMI Cores

19 mm

38 mm

12.7 mm

ESD-R-SR

Tray

Ferrite Toroids / Ferrite Rings 50x23x18mm Mn-Zn Case and Tape

ESD-R-47-1
KEMET
1: $13.46
220On Order

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

Datasheet

220On Order

$13.46

$10.04

$8.85

$7.92

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

23 mm

50 mm

18 mm

ESD-R

Tray

Manganese Zinc (MnZn)

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

ESD-R-47B
KEMET
1: $11.26
90On 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

Datasheet

90On Order

$11.26

$6.09

$6.07

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

25.5 mm

51.5 mm

17.5 mm

ESD-R-B

Bulk

Manganese Zinc (MnZn)

Ferrite Toroids / Ferrite Rings 61x32.4x24mm Mn-Zn Case and Tape

ESD-R-57A-1
KEMET
1: $30.89
60Expected 26/3/2026

Mfr. Part No.
ESD-R-57A-1

Mouser Part No
80-ESD-R-57A-1

KEMET

Ferrite Toroids / Ferrite Rings 61x32.4x24mm Mn-Zn Case and Tape

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Datasheet

60Expected 26/3/2026

$30.89

$23.63

$21.13

$19.11

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

32.4 mm

61 mm

24 mm

ESD-R

Tray

Manganese Zinc (MnZn)

Ferrite Toroids / Ferrite Rings 32.4mm

ESD-R-57D-1
KEMET
1: $38.96
59Expected 23/4/2026

Mfr. Part No.
ESD-R-57D-1

Mouser Part No
80-ESD-R-57D-1

KEMET

Ferrite Toroids / Ferrite Rings 32.4mm

Learn More

Datasheet

59Expected 23/4/2026

$38.96

$21.68

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

32.4 mm

61 mm

24 mm

ESD-R

Bulk

Nickel Zinc

Ferrite Toroids / Ferrite Rings 61x33.2x25mm 10MHz Mn-Zn 120C

ESD-R-57M-H
KEMET
1: $29.68
60Expected 28/5/2026

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

Datasheet

60Expected 28/5/2026

$29.68

$22.70

$20.31

$18.36

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

33.2 mm

61 mm

25 mm

ESD-R-H

Tray

Ferrite Toroids / Ferrite Rings 26x14x15mm Ni-Zn Case and Tape

ESD-R-25D-1
KEMET
1: $3.45
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

Datasheet

Non-Stocked Lead-Time 23 Weeks

$3.45

$2.04

$1.78

$1.56

$1.25

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

14 mm

26 mm

15 mm

ESD-R

Tray

Nickel Zinc

Ferrite Toroids / Ferrite Rings 25.3x14.8x12.3mm Mn-Zn Coated

ESD-R-25MK
KEMET
1: $4.55
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

Datasheet

Lead-Time 23 Weeks

$4.55

$2.45

$2.03

$1.72

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

14.8 mm

25.3 mm

12.3 mm

ESD-R

Tray

Manganese Zinc (MnZn)

Ferrite Toroids / Ferrite Rings 51x24.4x19mm 300MHz Ni-Zn 120C

ESD-R-47N-H
KEMET
1: $12.98
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

Datasheet

Lead-Time 23 Weeks

$12.98

$7.27

$6.63

$6.60

$5.99

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings

Toroids

24.4 mm

51 mm

19 mm

ESD-R-H

Tray

Ferrite Toroids / Ferrite Rings 57x36x20mm 150kHz Mn-Zn 85C

ESD-R-57SR
KEMET
60: $18.24
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

Datasheet

Non-Stocked Lead-Time 23 Weeks

$18.24

Min.: 60
Mult.: 15

Ferrite Toroids / Ferrite Rings

EMI Cores

36 mm

57 mm

20 mm

ESD-R-SR

Tray

EMI Cores

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Support

5 mm
5.5 mm
6 mm
6.2 mm
6.3 mm
7 mm
7.3 mm
7.7 mm
8.5 mm
8.8 mm
9 mm
9.4 mm
9.5 mm
10 mm
10.5 mm
10.7 mm
11.6 mm
12.7 mm
13 mm
13.8 mm

9.5 mm
10 mm
10.5 mm
11.8 mm
12 mm
12.9 mm
14 mm
14.3 mm
14.4 mm
15 mm
15.2 mm
15.8 mm
16 mm
16.5 mm
17.5 mm
17.7 mm
18 mm
18.5 mm
19 mm
19.6 mm

3 mm
3.5 mm
5 mm
5.3 mm
5.5 mm
6 mm
6.4 mm
8 mm
8.4 mm
9 mm
10 mm
11 mm
12 mm
12.1 mm
12.3 mm
12.5 mm
12.7 mm
13 mm
13.2 mm
14 mm