Passive Components – Mouser Canada

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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 10mm

ESD-R-19SD
KEMET
1: $1.57
1,981Expected 2026-06-04

Mfr. Part #
ESD-R-19SD

Mouser Part #
80-ESD-R-19SD

KEMET

Ferrite Toroids / Ferrite Rings 10mm

Datasheet

1,981Expected 2026-06-04

$1.57

$0.832

$0.617

$0.535

$0.505

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm

ESD-R-25D-B
KEMET
1: $3.89
584Expected 2026-03-26

Mfr. Part #
ESD-R-25D-B

Mouser Part #
80-ESD-R-25D-B

KEMET

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 13.9mm

Datasheet

584Expected 2026-03-26

$3.89

$2.29

$2.02

$1.75

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 15mm

ESD-R-25SD
KEMET
1: $2.05
2,129On Order

Mfr. Part #
ESD-R-25SD

Mouser Part #
80-ESD-R-25SD

KEMET

Ferrite Toroids / Ferrite Rings 15mm

Datasheet

2,129On Order

$2.05

$1.08

$0.792

$0.671

$0.662

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 16mm

ESD-R-28C
KEMET
1: $3.91
600Expected 2026-07-27

Mfr. Part #
ESD-R-28C

Mouser Part #
80-ESD-R-28C

KEMET

Ferrite Toroids / Ferrite Rings 16mm

Datasheet

600Expected 2026-07-27

$3.91

$2.03

$1.44

$1.38

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 19mm

ESD-R-31C
KEMET
1: $3.78
793On Order

Mfr. Part #
ESD-R-31C

Mouser Part #
80-ESD-R-31C

KEMET

Ferrite Toroids / Ferrite Rings 19mm

Datasheet

793On Order

$3.78

$2.68

$2.02

$1.78

View

Min.: 1
Mult.: 1

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

ESD-R-31C-1
KEMET
1: $6.48
350Expected 2026-07-23

Mfr. Part #
ESD-R-31C-1

Mouser Part #
80-ESD-R-31C-1

KEMET

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

Datasheet

350Expected 2026-07-23

$6.48

$4.67

$4.03

$3.57

View

Min.: 1
Mult.: 1

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

ESD-R-38SR
KEMET
1: $9.87
200Expected 2026-07-23

Mfr. Part #
ESD-R-38SR

Mouser Part #
80-ESD-R-38SR

KEMET

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

Datasheet

200Expected 2026-07-23

$9.87

$7.29

$6.39

$5.69

View

Min.: 1
Mult.: 1

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

ESD-R-47-1
KEMET
1: $15.00
220On Order

Mfr. Part #
ESD-R-47-1

Mouser Part #
80-ESD-R-47-1

KEMET

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

Datasheet

220On Order

$15.00

$11.19

$9.87

$8.84

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

ESD-R-47B
KEMET
1: $12.56
90Expected 2026-07-15

Mfr. Part #
ESD-R-47B

Mouser Part #
80-ESD-R-47B

KEMET

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

Datasheet

90Expected 2026-07-15

$12.56

$6.79

$6.77

Min.: 1
Mult.: 1

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

ESD-R-57A-1
KEMET
1: $34.44
60Expected 2026-03-26

Mfr. Part #
ESD-R-57A-1

Mouser Part #
80-ESD-R-57A-1

KEMET

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

Datasheet

60Expected 2026-03-26

$34.44

$26.35

$23.56

$21.31

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 32.4mm

ESD-R-57D-1
KEMET
1: $43.45
59Expected 2026-04-23

Mfr. Part #
ESD-R-57D-1

Mouser Part #
80-ESD-R-57D-1

KEMET

Ferrite Toroids / Ferrite Rings 32.4mm

Datasheet

59Expected 2026-04-23

$43.45

$24.18

Min.: 1
Mult.: 1

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

ESD-R-57M-H
KEMET
1: $33.09
60Expected 2026-05-28

Mfr. Part #
ESD-R-57M-H

Mouser Part #
80-ESD-R-57M-H

KEMET

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

Datasheet

60Expected 2026-05-28

$33.09

$25.31

$22.65

$20.48

View

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 19.5x46.5x19.5mm 300MHz Ni-Zn 125C

ESD-SR-160HL
KEMET
1: $8.51
170Expected 2026-03-26

Mfr. Part #
ESD-SR-160HL

Mouser Part #
80-ESD-SR-160HL

KEMET

Ferrite Clamp On Cores 19.5x46.5x19.5mm 300MHz Ni-Zn 125C

Datasheet

170Expected 2026-03-26

$8.51

$5.97

$5.13

$4.51

View

Min.: 1
Mult.: 1

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

ESD-SR-190938X-R1
KEMET
1: $6.17
797On Order

Mfr. Part #
ESD-SR-190938X-R1

Mouser Part #
80-ESD-SR-190938X-R1

KEMET

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

797On Order

$6.17

$4.43

$3.84

$3.39

View

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 31.5x13x38mm Ni-Zn Snap-on

ESD-SR-250G
KEMET
1: $12.88
140Expected 2026-04-07

Mfr. Part #
ESD-SR-250G

Mouser Part #
80-ESD-SR-250G

KEMET

Ferrite Clamp On Cores 31.5x13x38mm Ni-Zn Snap-on

Datasheet

140Expected 2026-04-07

$12.88

$9.59

$7.56

$6.98

View

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 30x13x42mm Ni-Zn AEC-Q200

ESD-SR-250HL
KEMET
1: $16.55
60Expected 2026-07-23

Mfr. Part #
ESD-SR-250HL

Mouser Part #
80-ESD-SR-250HL

KEMET

Ferrite Clamp On Cores 30x13x42mm Ni-Zn AEC-Q200

Datasheet

60Expected 2026-07-23

$16.55

$9.01

$7.49

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 44x16.5mm 10MHz Mn-Zn 85C

ESD-SR-S38M
KEMET
1: $19.90
72Expected 2026-04-07

Mfr. Part #
ESD-SR-S38M

Mouser Part #
80-ESD-SR-S38M

KEMET

Ferrite Clamp On Cores 44x16.5mm 10MHz Mn-Zn 85C

Datasheet

72Expected 2026-04-07

$19.90

$15.04

$13.28

$11.90

View

Min.: 1
Mult.: 1

Ferrite Cable Cores 4.8x2.4mm 300MHz Ni-Zn Coated

B-20L-48B-A
KEMET
30,000: $0.938
Non-Stocked Lead-Time 29 Weeks

Mfr. Part #
B-20L-48B-A

Mouser Part #
80-B-20L-48B-A

KEMET

Ferrite Cable Cores 4.8x2.4mm 300MHz Ni-Zn Coated

Datasheet

Non-Stocked Lead-Time 29 Weeks

$0.938

Min.: 30,000
Mult.: 5,000

Ferrite Cable Cores Split Core Flat 56mm Cable

ESD-FPD-40
KEMET
1: $13.49
Non-Stocked Lead-Time 23 Weeks

Mfr. Part #
ESD-FPD-40

Mouser Part #
80-ESD-FPD-40

KEMET

Ferrite Cable Cores Split Core Flat 56mm Cable

Datasheet

Non-Stocked Lead-Time 23 Weeks

$13.49

$7.47

$6.48

$6.05

Min.: 1
Mult.: 1

Ferrite Cable Cores 44.5x1.3mm Bare Ni-Zn for Flat Cable

ESD-FPL-49.6-12
KEMET
1: $3.95
Non-Stocked Lead-Time 23 Weeks

Mfr. Part #
ESD-FPL-49.6-12

Mouser Part #
80-ESD-FPL-49.6-12

KEMET

Ferrite Cable Cores 44.5x1.3mm Bare Ni-Zn for Flat Cable

Datasheet

Non-Stocked Lead-Time 23 Weeks

$3.95

$2.33

$1.98

$1.49

$1.44

Min.: 1
Mult.: 1

Ferrite Cable Cores 52x1.3mm Bare Ni-Zn for Flat Cable

ESD-FPL-57.6-12
KEMET
1: $6.43
Lead-Time 23 Weeks

Mfr. Part #
ESD-FPL-57.6-12

Mouser Part #
80-ESD-FPL-57.6-12

KEMET

Ferrite Cable Cores 52x1.3mm Bare Ni-Zn for Flat Cable

Datasheet

Lead-Time 23 Weeks

$6.43

$3.74

$3.15

$2.64

$2.54

Min.: 1
Mult.: 1

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

ESD-R-25D-1
KEMET
1: $3.84
Non-Stocked Lead-Time 23 Weeks

Mfr. Part #
ESD-R-25D-1

Mouser Part #
80-ESD-R-25D-1

KEMET

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

Datasheet

Non-Stocked Lead-Time 23 Weeks

$3.84

$2.28

$1.98

$1.74

$1.39

Min.: 1
Mult.: 1

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

ESD-R-25MK
KEMET
1: $5.07
Lead-Time 23 Weeks

Mfr. Part #
ESD-R-25MK

Mouser Part #
80-ESD-R-25MK

KEMET

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

Datasheet

Lead-Time 23 Weeks

$5.07

$2.73

$2.26

$1.92

Min.: 1
Mult.: 1

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

ESD-R-47N-H
KEMET
1: $14.48
Lead-Time 23 Weeks

Mfr. Part #
ESD-R-47N-H

Mouser Part #
80-ESD-R-47N-H

KEMET

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

Datasheet

Lead-Time 23 Weeks

$14.48

$8.11

$7.39

$7.36

$6.68

Min.: 1
Mult.: 1

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

ESD-R-57SR
KEMET
60: $20.34
Non-Stocked Lead-Time 23 Weeks

Mfr. Part #
ESD-R-57SR

Mouser Part #
80-ESD-R-57SR

KEMET

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

Datasheet

Non-Stocked Lead-Time 23 Weeks

$20.34

Min.: 60
Mult.: 15