Product Line Catalogue

Soft Ferrite Materials & Components

for Power, Signal and EMC Applications

MMG Canada Limited

MMG Companies: MMG-Neosid

Huntingdon Magnets

MMG-North America

MMG-Neosid has been manufacturing magnetic materials since its foundation in 1936
and now manufactures an extensive range of soft ferrite components and accessories.
These are used in the Industrial, Computer, Telecommunications and Automotive/
Aerospace industries and include both Mn-Zn and Ni-Zn ferrite components, thermo-
set/thermoplastic formers and bobbins, and clips.

We also offer a range of toroids and rods (leaded and un-leaded) in Iron and Nickel-
Iron Powders including Molypermalloy.

Isotropic hard ferrite magnets and resin bonded Neodymium-Iron-Boron magnets are
also available from Huntingdon Magnets - a division of MMG-Neosid, based in
Letchworth.

Always sensitive to market changes, MMG-Neosid is constantly developing new ferrite
materials and component geometries to meet changing customer requirements and it
is the experience gained from this that allows us to provide the very best of technical
support and assistance to our customers at all stages of their projects.

Our ISO 9002 accreditation forms the basis of our Quality Assurance Policy but we
would like to think we go beyond the scope of this and offer quality in every aspect of
the way we do business.

The Company’s policy is one of continuous
improvement and development and the right to
change materials, designs, dimensions and
descriptive matter, etc. at any time without notice is
reserved.
Specifications and information contained within this
brochure are intended for guidance only.

MMG-Neosid has exercised the utmost care and
attention in compiling the information contained in
this brochure and believes it to be accurate and
reliable.
 However, it is provided for illustrative purposes only
and MMG-Neosid gives no warranty and makes no
representation that  the theory or other information
contained in the brochure is suitable for any
particular purpose or application.
MMG-Neosid shall not be liable for any loss, direct
or consequential, which may result from the use of
such information.

MMG Canada Ltd

 Materials and Applications

TABLE OF CONTENTS

Component Information

E Cores & Accessories

Planar E Cores

EFD Cores & Accessories

EP Cores & Accessories

ETD Cores & Accessories

2 Slot Pot Cores & Accessories

4 Slot Pot Cores & Accessories

RM Cores & Accessories

Low Profile RM Cores

U Cores & Accessories

Ring Cores

EMC/EMI Suppression & other ferrites

Plastic Products

Soft Ferrite Materials

Technical Information

Terms & Conditions of Sale

Terms & Conditions

Glossary of Terms

Index

Definitions & Properties of Soft Ferrites

Gapped Cores

Product Quality

F47

F45

F44

F5A

F9

F9C

Soft Ferrite Materials

Specific Material Data

F10

F39

P11

P12

F58

F19

F25

F28

F29

F14

F16

Material Characteristics

The following data tabulates the specified material
characteristics of MMG ferrites.
Supplementary graphs show typical performance.
These are given for guidance only.

Data is derived from measurements on toroidal
cores and the values obtained cannot be directly
transferred to products of another shape and size.

The Nickel-Zinc ferrites (mainly used in open-circuit
configurations) are described by Loss Factors
corresponding to the sum of the residual and eddy
current losses.
The grades of Manganese-Zinc ferrites mainly
developed for power applications are characterised
by the Power Loss Density under specified
conditions.
Other Manganese-Zinc ferrites, especially those
used in low frequency telecommunication

Information given for individual grades of ferrite
specify the typical or maximum Loss Factors  for a
range of frequencies where these losses remain
fairly low. Generally speaking, these loss factors
increase with frequency at a steady rate, slowly at
first and then rapidly increasing to overtake the
frequency rise. The point at which this accelerated
rate of increase of loss factors occurs depends upon
the composition and sintering conditions and may
vary between batches of cores.

At frequencies well outside their normal range of
application, all ferrites exhibit high loss
characteristics, and are extensively used for
suppression purposes.

Applications Guide

MMG ferrites are used in an extensive range of
products and applications. Electronics applications
are constantly developing. Listed below is an
applications guide outlining the most popular use of
MMG material grades. It is intended for guidance
only.

Pot cores/RM cores for inductors, transformers -
Grades:

 P11, P12, F58, F5A, F44, F45, F47, F9,

F9C, F10, F39

Low power and pulse transformer cores -
Grades:

F9, F9C, F10, F39, F14

Balun cores -
Grades:

P11, F9, F9C, F10, F19, F14

High power transformer core (E,U & Ring) -
Grades:

F5A, F44, F45, F47

Suppression cores -
Grades:

F9, F9C, F10, F39, F19, F14

Toroidal cores -
Grades:

All grades.

Aerial Rods and slabs -
Long and medium waves:
Grades:

F14

Short wave and VHF:
Grades:

F16, F25, F28, F29

Screw cores, rods, pins and tubes -
Grades:

F14, F25, F29

High frequency welding impeders -
Grades:

F14, F59

applications, are characterised by both the residual
and eddy current loss factor and the hysteresis loss
factors.

Manganese-Zinc ferrites for Industrial and Professional Applications

Parameter

Symbol

Standard Conditions

Unit

F47

F45

F44

F5A

of test

Initial

B<0.1mT

Permeability

µ

i

-

1800

2000

1900

2500

(nominal)

10kHz

25°C

±20%

±20%

±20%

±20%

Saturation

H=796 A/m

Flux Density

B

sat

   =10 Oe

25°C

mT

470

500

500

470

   (typical)

Static

100°C

350

380

400

350

Remanent

H

⇒

0 (from near Saturation)

Flux Density

B

r

mT

130

165

270

150

   (typical)

10kHz

25°C

Coercivity

B

⇒

0 (from near Saturation)

(typical)

H

c

10kHz

25°C

A/m

24

15

27

15

Loss Factor

B<0.1mT

(maximum)

25°C

10kHz

-

-

-

-

tan 

δ

 

(r+e)

100kHz

10

-6

-

-

-

-

µ

i

200kHz

-

-

-

-

1MHz

-

-

-

-

Temperature

∆

µ

B<0.1mT

10kHz

10

-6

/

Factor

µ

i

2

.

∆

T

+25°C to +55°C

°C

-

-

-

-

Curie
Temperature

Θ

C

B<0.10mT

10kHz

°C

200

230

230

200

(minimum)

Disaccomodation

∆

µ

B<0.25mT

10kHz

Factor (max)

µ

i

2

.log

10

(t

2

/t

1

)

50°C

10

-6

-

-

-

-

10 to 100 mins

Hysteresis

B from 1.5 to 3mT

10

-6

/

Material

η

Β

10kHz

25°C

mT

-

-

-

-

Constant(max)

Resistivity

1 V/cm

ohm-

(typical)

ρ

25°C

cm

100

100

100

100

 Amplitude

400mT

25°C

2000

2500

2500

2400

Permeability

µ

a

320mT

100°C

-

2500

-

-

1825

(minimum)

340mT

100°C

-

2000

1900

-

Total Power

200mT;   25kHz

25°C

120

-

200

-

Loss Density

200mT;   25kHz

60°C

-

-

-

190

(Maximum)

P

v

200mT;   25kHz

100°C

mW/

100

-

130

190

200mT;   25kHz

120°C

cm³

-

110

-

-

100mT;  100kHz

25°C

110

-

250

-

100mT;  100kHz

100°C

80

80

160

-

100mT;  100kHz

120°C

-

-

-

-

200mT;  100kHz

100°C

-

400

750

-

 50mT;   400kHz

25°C

150

-

-

-

 50mT;   400kHz

100°C

150

-

-

-

Typical Core Shapes:

ETD

E

E

E

EFD

ETD

ETD

ETD

Ring

EFD

EFD

Ring

Planar

Ring

Ring

RM

E

RM

RM & Pot

U

RM

U & I

EP

Initial
Permeability
(Nominal)

Saturation
Flux Density
(Typical)

Remanent
Flux Density
(Typical)

Coercivity
(Typical)

Loss Factor
(Maximum)

Temperature
Factor

Curie
Temperature
(Minimum)

Disaccomodation
Factor (Max)

Hysteresis
Material
Constant (Max)

Resistivity
(Typical)

Data is derived from measurements on toroidal cores.

These values cannot be directly transferred to actual
products. The product related data can be taken only
from the relevant product specification.

Material Grade

Part No. suffix

F47

-47

F45

-45

F44

-44

F5A

-49

F9

-36

F9C

C36

F10

-37

F39

-39

P11

-41

P12

-42

F58

-58

When specifying
materials the
following
component Part
No. suffixes apply.

F9

F9C

F10

F39

P11

P12

F58

Parameter

4400

5000

6000

10 000

2250

2000

750

±20%

±20%

±20%

±20%

±20%

±20%

±20%

380

460

380

380

-

-

450

180

170

100

200

70

35

94

13

13

11

16

18

7

47

---

-

-

-

1.5

0.8

-

20

20

20

-

5

2.5

-

-

-

-

-

-

-

12

-

-

-

-

-

-

20

0 to

-1 to

-1 to

0.5 to

0.4 to

0.5 to

+2

+2

+2

-

1.5

1.0

2.3

130

160

130

125

150

150

200

-

-

-

-

4

3

12

-

-

-

-

0.8

0.45

1.8

50

50

50

100

100

100

100

Pot

Ring

Ring

Ring

RM

RM

RM

RM

E

RM

RM

Pot

Pot

Pot

E

RM

EP

EP

EP

Pot

Pot

Pot

U & I

Nickel-Zinc ferrites for Industrial and Professional Applications

Parameter

Symbol

Standard Conditions

Unit

F19

 F14

F16

of test

Initial

B<0.1mT

Permeability

µ

i

-

1000

220

125

(nominal)

10kHz

25°C

±20%

±20%

±20%

Saturation

H=796 A/m

Flux Density

B

sat

   =10 Oe

25°C

mT

260

350

340

(typical)

Static

Remanent

H

⇒

0 (from near Saturation)

Flux Density

B

r

mT

130

270

165

(typical)

10kHz

25°C

Coercivity

B

⇒

0 (from near Saturation)

(typical)

H

c

10kHz

25°C

A/m

53

172

200

Loss Factor

B<0.1mT

(maximum)

25°C

250kHz

-

-

-

tan 

δ

 

(r+e)

500kHz

130

40

-

µ

i

1MHz

350

42

60

2MHz

-

50

-

3MHz

-

-

-

5MHz

10

-6

-

-

65

10MHz

-

-

100

15MHz

-

-

-

20MHz

-

-

-

40MHz

-

-

-

100MHz

-

-

-

200MHz

-

-

-

Temperature

∆

µ

B<0.1mT

10kHz

10

-6

/

3 to

12 to

20 to

Factor

µ

i

2

.

∆

T

+25°C to +55°C

°C

6.5

30

50

Curie
Temperature

Θ

Χ

B<0.10mT

10kHz

°C

120

270

270

(minimum)

Resistivity

1 V/cm

ohm-

(typical)

ρ

25°C

cm

10

5

10

5

10

5

Typical Core Shapes:

Ring

Rods

On

Beads

 Chokes

Request

Tubes

Flat Cable

Suppressor

Initial
Permeability
(Nominal)

Saturation
Flux Density
(Typical)

Remanent
Flux Density
(Typical)

Coercivity
(Typical)

Loss Factor
(Maximum)

Temperature
Factor

Curie
Temperature
(Minimum)

Resistivity
(Typical)

Data is derived from measurements on toroidal cores.

These values cannot be directly transferred to actual
products. The product related data can be taken only
from the relevant product specification.

*

These are perminvar ferrites and undergo irreversible

changes of characteristics (permeability increases and
loss factors become much greater - especially at high
frequencies) if subjected to strong magnetic fields or
mechanical shock.

F25*

F28*

 F29*

50

30

12

±20%

±20%

±20%

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

50

-

-

50

-

-

55

-

-

65

-

-

75

80

100

100

-

-

125

-

-

300

-

-

-

250

200

-

-

1000

10 to

15

30

50

450

500

500

10

5

10

5

10

5

Rods

Rods

Rods

Slabs

Slabs

Slabs

Material Grade

Part No. suffix

F19

-38

F14

-31

F16

-32

F25

-34

F28

-46

F29

-35

When specifying
materials the
following
component Part
No. suffixes apply.

Parameter

Symbol

Standard Conditions

Unit

F47

of test

Initial Permeability

B<0.1mT

-

1800

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

25°C

mT

470

Density 

(typical)

100°C

350

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

130

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

24

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

200

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Amplitude Permeability

400mT

25°C

-

2500

(minimum)

340mT

100°C

2000

Total Power
Loss Density

100mT; 100kHz

25°C (typ.)

mW/

110

100mT; 100kHz 100°C (max.)

cm³

80

1

50mT; 400kHz

25°C (typ.)

150

1

50mT; 400kHz 100°C (max.)

150

B

sat

B

r

-

H

c

Θ

c

ρ

µ

a

P

v

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Power Loss Density vs. Frequency

Power Loss Density vs. Temperature

Static Magnetisation: Permeability vs. B

Dynamic Magnetisation:  Typical B-H Loops

23°C

100°C

Data derived from measurements on a ring core of 30mm outside diameter.

F47

Material Type:

Manganese-Zinc Ferrite

Properties:

*Higher frequency power grade
*Low losses in recommended

frequency range

*High saturation
*Medium Permeability
*Losses minimised 60°C - 80°C

Frequency Range:

300kHz to 1MHz (depending
upon flux density)

Typical Applications:

SMPS.

Available core shapes:

E, ETD, EFD, RM, Ring Cores.

Parameter

Symbol

Standard Conditions

Unit

F45

of test

Initial Permeability

B<0.1mT

-

2000

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

25°C

mT

500

Density 

(typical)

100°C

380

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

165

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

15

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

230

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Amplitude Permeability

400mT

25°C

-

2500

(minimum)

340mT

100°C

2000

Total Power

100mT;  100kHz

100°C

mW/

80

Loss Density

P

v

200mT;  100kHz

100°C

cm³

400

(maximum)

B

sat

B

r

-

H

c

Θ

c

ρ

µ

a

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Power Loss Density vs. Frequency

Power Loss Density vs. Temperature

Static Magnetisation: Permeability vs. B

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

F45

Material Type:

Manganese-Zinc Ferrite

Properties:

*Low loss power grade.
*High saturation
*Losses minimised 80°C - 100°C
*Medium permeability

Frequency range:

Up to 500kHz (depending
upon flux density)

Typical Applications:

SMPS.

Available core shapes:

E, U, ETD, RM, Ring Cores.

Parameter

Symbol

Standard Conditions

Unit

F44

of test

Initial Permeability

B<0.1mT

-

1900

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

25°C

mT

500

Density 

(typical)

100°C

400

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

270

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

27

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

230

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Amplitude Permeability

400mT

25°C

-

2500

(minimum)

340mT

100°C

1900

Total Power

200mT;   25kHz

25°C

200

Loss Density

200mT;   25kHz

100°C

mW/

130

(maximum)

100mT; 100kHz

25°C

cm³

250

100mT; 100kHz

100°C

160

200mT; 100kHz

100°C

750

B

sat

B

r

-

H

c

Θ

c

ρ

µ

a

P

v

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Power Loss Density vs. Frequency

Power Loss Density vs. Temperature

Static Magnetisation: Permeability vs. B

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

Complex Permeability vs. Frequency

F44

Material Type:

Manganese-Zinc Ferrite

Properties:

*Higher saturation power grade
*Higher amplitude permeability
*Low power losses in
  recommended frequency range
*Losses minimised above 70°C
*Medium permeability

Frequency range:

Up to 300kHz 

(depending upon flux density)

Typical Applications:

SMPS, EHT Transformers,
converters.

Available core shapes:

E, U, ETD, EFD,EP,Pot,  RM,
Ring Cores.

Parameter

Symbol

Standard Conditions

Unit

F5A

of test

Initial Permeability

B<0.1mT

-

2500

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

25°C

mT

470

Density 

(typical)

100°C

350

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

150

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

15

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

200

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Amplitude Permeability

400mT

25°C

-

2400

(minimum)

320mT

100°C

1825

Total Power

200mT; 25kHz

60°C

mW/

190

Loss Density

P

v

200mT;25kHz

100°C

cm³

190

(maximum)

B

sat

B

r

-

H

c

Θ

c

ρ

µ

a

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Power Loss Density vs. Frequency

Power Loss Density vs. Temperature

Static Magnetisation: Permeability vs. B

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

25°C

100°C

F5A

Material Type:

Manganese-Zinc Ferrite

Properties:

*Higher permeability power
  grade
*High saturation
*Low loss
*Losses minimised 50°C - 80°C

Frequency range:

Up to 150/200kHz (depending

upon flux density)

Typical Applications:

Power Supplies, EHT
Transformers.

Available core shapes:

E, U, ETD, RM, Ring Cores.

60°C

Relative Loss Factor vs. Frequency

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

Parameter

Symbol

Standard Conditions

Unit

F9

of test

Initial Permeability

B<0.1mT

-

4400

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

380

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

180

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

13

Loss Factor

B<0.10mT

(maximum)

10kHz

25°C

10

-6

20

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

130

Temperature Factor

+25°C to +55°C

0 to

B<0.10mT

10kHz

°C

+2

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

50

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

F9

Material Type:

Manganese-Zinc Ferrite

Properties:

High permeability.

Frequency range:

Depends on application

Typical Applications:

Wideband & Pulse
Transformers, Filter &
Interference

 Suppression

applications.

Available core shapes:

Ring, E, EP, U, RM & Pot Cores.

Initial Permeability vs. Temperature

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Power Loss Density vs. Frequency

Power Loss Density vs. Temperature

Normalised Impedance vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

25°C

Parameter

Symbol

Standard Conditions

Unit

F9C

of test

Initial Permeability

B<0.1mT

-

5000

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

460

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

170

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

13

Loss Factor

B<0.10mT

(maximum)

10kHz

25°C

10

-6

20

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

160

Temperature Factor

+25°C to +55°C

-1 to

B<0.10mT

10kHz

°C

+2

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

50

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

Complex Permeability vs. Frequency

F9C

Material Type:

Manganese-Zinc Ferrite

Properties:

*High permeability
*High saturation
*Improved frequency response

(depending on application)

*High Curie temperature

Frequency range:

Depends on application

Typical Applications:

Specially developed for Mains
filtering, Wideband and Pulse
Transformers

Available core shapes:

Ring, E, RM & Pot Cores.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Z

act

=

Z

norm

C1

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

Parameter

Symbol

Standard Conditions

Unit

F10

of test

Initial Permeability

B<0.1mT

-

6000

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

380

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

200

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

16

Loss Factor

B<0.10mT

(maximum)

10kHz

25°C

10

-6

-

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

130

Temperature Factor

+25°C to +55°C

-1 to

B<0.10mT

10kHz

°C

+2

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

50

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

Complex Permeability vs. Frequency

F10

Material Type:

Manganese-Zinc Ferrite

Properties:

High permeability.

Frequency range:

Depends on application

Typical Applications:

Wideband, Pulse
Transformers and Filter
applications.

Available core shapes:

Ring, E, EP, RM & Pot Cores.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

Parameter

Symbol

Standard Conditions

Unit

F39

of test

Initial Permeability

B<0.1mT

-

10 000

(nominal)

10kHz

25°C

±30%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

380

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

200

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

16

Loss Factor

B<0.10mT

(maximum)

10kHz

25°C

10

-6

-

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

125

Temperature Factor

+25°C to +55°C
B<0.10mT

10kHz

°C

-

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

F39

Material Type:

Manganese-Zinc Ferrite

Properties:

Very high permeability

Frequency range:

Depends on application

Typical Applications:

Broadband and Pulse
Transformers, Balanced
(common-mode) chokes and

inductors for filters.

Available core shapes:

EP, Pot, RM, Ring Cores.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Parameter

Symbol

Standard Conditions

Unit

P11

of test

Initial Permeability

B<0.1mT

-

2250

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

-

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

70

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

18

Loss Factor

B<0.10mT

10kHz

1.5

(maximum)

25°C

100kHz

10

-6

5

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

150

Hysteresis Material

B from 1.5 to 3mT

10

-6

/

Constant

 (maximum)

10kHz

25°C

°C

0.8

Disaccommodation

10 to 100mins.

50°C

Factor  

(maximum)

B<0.25mT

10kHz

10

-6

4

Temperature Factor

+25°C to +55°C

0.5 to

B<0.10mT

10kHz

°C

1.5

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

B

sat

B

r

-

H

c

Θ

C

ρ

η

B

µ

i

2

.log

10

(t

2

/t

1

)

∆

µ

P11

Material Type:

Manganese-Zinc Ferrite

Properties:

*High stability of inductance
*Low temperature coefficient
*Low loss factors
*Medium permeability

Frequency range:

Depends on application

Typical Applications:

Filter networks and proximity
detectors

Available core shapes:

RM and Pot Cores.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Parameter

Symbol

Standard Conditions

Unit

P12

of test

Initial Permeability

B<0.1mT

-

2000

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

-

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

35

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

7

Loss Factor

B<0.10mT

10kHz

0.8

(maximum)

25°C

100kHz

10

-6

2.5

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

150

Hysteresis Material

B from 1.5 to 3mT

10

-6

/

Constant

 (maximum)

10kHz

25°C

°C

0.45

Disaccommodation

10 to 100mins.

50°C

Factor  

(maximum)

B<0.25mT

10kHz

10

-6

3

Temperature Factor

+25°C to +55°C

0.4 to

B<0.10mT

10kHz

°C

1

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

B

sat

B

r

-

H

c

Θ

C

ρ

η

B

µ

i

2

.log

10

(t

2

/t

1

)

∆

µ

P12

Material Type:

Manganese-Zinc Ferrite

Properties:

*High stability of inductance
*Low temperature coefficient
*Low loss factors
*Medium permeability

Frequency range:

Depends on application.

Typical Applications:

Filter networks.

Available core shapes:

RM and Pot cores.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Parameter

Symbol

Standard Conditions

Unit

F58

of test

Initial Permeability

B<0.1mT

-

750

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

450

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

94

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

47

Loss Factor

B<0.10mT

200kHz

12

(maximum)

25°C

1MHz

10

-6

20

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

200

Hysteresis Material

B from 1.5 to 3mT

10

-6

/

Constant

 (maximum)

10kHz

25°C

°C

1.8

Disaccommodation

10 to 100mins.

50°C

Factor  

(maximum)

B<0.25mT

10kHz

10

-6

12

Temperature Factor

+25°C to +55°C

0.5 to

B<0.10mT

10kHz

°C

2.3

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

100

Material Specification

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

B

sat

B

r

-

H

c

Θ

C

ρ

η

B

µ

i

2

.log

10

(t

2

/t

1

)

∆

µ

F58

Material Type:

Manganese-Zinc Ferrite

Properties:

*High stability of inductance
*Low temperature coefficient
*Low loss factors at higher

frequencies in the
recommended range

Frequency range:

200kHz-1MHz 

(Subject to application)

Typical Applications:

Filter applications, proximity

switches and gate drive

transformers for SMPS.

Available core shapes:

RM and Pot Cores

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Data is derived from measurements on a ring core of 30mm outside diameter.

Parameter

Symbol

Standard Conditions

Unit

F19

of test

Initial Permeability

B<0.1mT

-

1000

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

260

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

165

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

53

Loss Factor

B<0.10mT

500kHz

130

(maximum)

25°C

1MHz

10

-6

350

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

120

Temperature Factor

+25°C to +55°C

3 to

B<0.10mT

10kHz

°C

6.5

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

10

4

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

Dynamic Magnetisation:  Typical B-H Loops

Normalised Impedance vs. Frequency

F19

Material Type:

Nickel-Zinc Ferrite

Properties:

*Medium permeability
*Low loss factors at low

frequencies

*High impedance at

megahertz frequencies

Frequency range:

100kHz - 1MHz 

(Low losses)

25MHz - 100MHz 

(High impedance)

Typical Applications:

SMD suppression

Available core shapes:

Ring cores, beads, sleeves,
cable suppressors, SM beads.

Z

act

≈

Z

norm

C1

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 30mm outside diameter.

Parameter

Symbol

Standard Conditions

Unit

F14

of test

Initial Permeability

B<0.1mT

-

220

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

350

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

217

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

172

Loss Factor

B<0.10mT

500kHz

40

(maximum)

1MHz

10

-6

42

25°c

2MHz

50

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

270

Temperature Factor

+25°C to +55°C

12 to

B<0.10mT

10kHz

°C

30

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

10

5

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

F14

Material Type:

Nickel-Zinc Ferrite

Properties:

*Low loss factors at medium

frequencies

*High suppression impedance

at high frequencies

Frequency range:

Up to 3MHz 

(Low losses)

Over 100MHz 

(Suppression)

Typical Applications:

RF Suppression, balun
transformers, aerial rods,
medium frequency tuned circuits.

Available core shapes:

Rods, Chokes.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Dynamic Magnetisation:  Typical B-H Loops

Data is derived from measurements on a ring core of 145x3.8x12mm (ODxIDxHT)

Parameter

Symbol

Standard Conditions

Unit

F16

of test

Initial Permeability

B<0.1mT

-

125

(nominal)

10kHz

25°C

±20%

Saturation Flux

H=796 A/m = 10 Oe

Density 

(typical)

25°C

mT

340

Remanent Flux

H

➞ 

0 

(from near Saturation)

Density 

(typical)

10kHz

25°C

mT

260

Coercivity

B

➞ 

0 

(from near Saturation)

(typical)

10kHz

25°C

A/m

200

Loss Factor

B<0.10mT

1MHz

60

(maximum)

5MHz

10

-6

65

25°c

10MHz

100

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

270

Temperature Factor

+25°C to +55°C

20 to

B<0.10mT

10kHz

°C

50

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

10

5

B

sat

B

r

-

H

c

Θ

C

Material Specification

ρ

F16

   

Special Grade

Material Type:

Nickel-Zinc Ferrite

Properties:

Low loss factors at high
frequency

Frequency range:

500kHz-10MHz

(Subject  to application)

Typical Applications:

Aerial rods and tuned circuits.

Available core shapes:

On request.

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

Data is derived from measurements on a ring core of 14.5x3.8x12mm (OD x ID x HT)

F25 F28 F29

Special Grades

Material Type:

Nickel-Zinc Ferrite

Properties:

*Perminvar
*Very high Q at high

frequency

Frequency range:

1MHz + depending on

material grade

Typical Applications:

Aerial rods and high
frequency tuned
circuits.

Available core shapes:

On request.

Material Specifications

Note

: Perminvar ferrites undergo irreversible

changes of characteristics if subject to strong
magnetic fields or mechanical shock.

Complex Permeability vs. Frequency

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

Complex Permeability vs. Frequency

Relative Loss Factor vs. Frequency

Initial Permeability vs. Temperature

F25

F28

F29

Θ

C

ρ

Parameter

Symbol Standard Conditions

Unit

F25

F28

F29

of test

Initial Permeability

B<0.1mT

-

50

30

12

(nominal)

10kHz

25°C

±20%

±20

±20

Loss Factor

B<0.10mT

1MHz

50

-

-

(maximum)

2MHz

50

-

-

3MHz

55

-

-

5MHz

10

-6

65

-

-

10MHz

75

80

100

15MHz

100

-

-

20MHz

125

-

-

40MHz

300

-

-

100MHz

-

250

200

200MHz

-

-

1000

Curie Temperature

(minimum)

B<0.10mT

10kHz

°C

450

500

500

Temperature Factor

+25°C to +55°C

10 to

3050

B<0.10mT

10kHz

°C

15

Resistivity

1 V/cm

ohm-

(typical)

25°C

cm

10

5

10

5

10

5

∆µ

µ

i

2

.

∆

T

tan

 δ

(r+e)

µ

i

EF 25 

32-

190

-

E 25/9.5/6 

32-

030

-

E 30/30/7 

32-

130

-

EF 32 

32-

360

-

E 34/8 

32-

010

-

E 34/14 

32-

320

-

E 41/9 

32-

020

-

E Cores and Accessories

E 41/16/12 

32-

330

-

E 42/15

 

     32-

110 

-

E 42/20

 

  32-

120

-

E 55/21

 

32-

150

-

E 55/25

 

32-

170

-

E 65/27

 

32-

240

-

E 70/32 

32-

250

-

EF 12.6 

32-

200

-

EF 16 

32-

370

-

E 19/8/5 

32-

160

-

E 20/10/5 

32-

140

-

EF 20 

32-

180

-

E Series

Components

E Series

Components

E Cores

E Cores were one of the first ferrite cores to be manufactured, being derived from their respective
iron lamination size. Having rectangular limbs they are relatively easy to manufacture and as such a
vast range exists in the marketplace. MMG-Neosid’s range reflects a selection of cores that have
become, over  many years, worldwide standards through continued use. E cores are particularly
suitable for power transformers and filters at low frequencies. They are not suitable in high frequency
applications as the rectangluar centre limb leads to higher leakage inductance and winding resistance.

E Core

Coilformer

E Core

EF 12.6

32-200-

EF 12.6

32-200-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

2.28mm

-1

29.60mm

13.00mm²

12.20mm²

384.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F9

 1000 +30/-20% - 1814 32-200-36

F44

 760 +30/-20% - 1380 32-200-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

6

59-200-66

SMD

1

10

59-205-76

 

Core Dimensions (mm)

A

B

C

D

E

F

G

12.20 -
13.10

6.30 -
6.50

3.40 -
3.70

4.20 -
4.50

8.90 -
9.50

3.40 -
3.70

12.60 -
13.00

Part Number

76-075-95

 

 Clips

EF 16

32-370-

EF 16

32-370-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.87mm

-1

37.60mm

20.10mm²

19.40mm²

754.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F9

 1400 +30/-20% - 2083 32-370-36

F44

 960 +30/-20% - 1428 32-370-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

6

59-370-66

Vertical

1

6

59-375-66

 

Core Dimensions (mm)

A

B

C

D

E

F

G

15.50 -
16.70

7.90 -
8.20

4.30 -
4.70

5.70 -
6.10

11.30 -
11.90

4.30 -
4.70

15.80 -
16.40

Part Number

76-076-95

 

 Clips

E 19/8/5

32-160-

E 19/8/5

32-160-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.78mm

-1

40.00mm

22.50mm²

-

900.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 970 +30/-20% - 1375 32-160-44

F5A

 1190 +30/-20% - 1685 32-160-49

F9

 2160 +30/-20% - 3060 32-160-36

F9C

 2350 +30/-20% - 3330 32-160C36

 

 Electrical Specification

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

8

59-160-76

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

18.80 -
19.80

7.95 -
8.20

4.57 -
4.93

5.59 -
5.84

13.80 -
15.30

4.57 -
4.93

15.90 -
16.40

E 20/10/5

32-140-

E 20/10/5

32-140-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.37mm

-1

43.00mm

31.00mm²

25.50mm²

1330.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 1390 +30/-20% - 1515 32-140-44

F9

 2500 +30/-20% - 2725 32-140-36

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

8

59-140-64

 

Core Dimensions (mm)

A

B

C

D

E

F

G

19.60 -

20.70

9.80 -

10.20

4.90 -
5.30

6.30 -
6.70

12.80 -
13.40

4.80 -
5.20

19.60 -

20.40

Part Number

76-077-95

 

 Clips

EF 20

32-180-

EF 20

32-180-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.34mm

-1

44.90mm

33.50mm²

31.40mm²

1500.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 1300 +30/-20% - 1385 32-180-44

F9

 2500 +30/-20% - 2585 32-180-36

 

 Electrical Specification

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

8

59-180-66

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

Part Number

76-077-95

 

 Clips

 

Core Dimensions (mm)

A

B

C

D

E

F

G

19.60 -

20.70

9.80 -

10.10

5.50 -
5.90

7.00 -
7.30

14.10 -
14.70

5.60 -
5.90

19.60 -

20.20

EF 25

32-190-

EF 25

32-190-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.09mm

-1

57.50mm

52.50mm²

51.50mm²

3020.00mm³

 

 Core Parameters

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

10

59-190-66

Horizontal

2

10

59-191-66

Part Number

76-078-95

 

 Clips

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F47

 1550 +30/-20% - 1345 32-190-47

F44

 1710 +30/-20% - 1485 32-190-44

F45

 1900 +30/-20% - 1650 32-190-45

F9

 3100 +30/-20% - 2690 32-190-36

F10

 4500 +30/-20% - 3900 32-190-37

 

Core Dimensions (mm)

A

B

C

D

E

F

G

24.30 -
25.40

12.30 -
12.80

6.90 -
7.50

8.70 -
9.20

17.50 -

18.30

7.00 -
7.50

24.60 -
25.60

E 25/9.5/6

32-030-

E 25/9.5/6

32-030-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.28mm

-1

48.70mm

38.10mm²

-

1860.00mm³

 

 Core Parameters

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

0

59-030-66

Horizontal

1

10

59-031-66

In accordance with IEC Document 60205.

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 1480 +30/-20% - 1510 32-030-44

F5A

 1835 +30/-20% - 1870 32-030-49

F9

 2740 +30/-20% - 2790 32-030-36

F9C

 3280 +30/-20% - 3340 32-030C36

F10

 4000 +30/-20% - 4075 32-030-37

F39

 8570 +40/-30% - 8730 32-030-39

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

24.77 -
26.03

9.40 -
9.65

6.07 -
6.47

6.30 -
6.68

19.05 -

20.07

6.07 -
6.47

18.80 -
19.30

E 30/30/7

32-130-

E 30/30/7

32-130-

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

10

59-130-64

Horizontal

1

12

59-130-66

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 1800 +30/-20% - 1605 32-130-44

F45

 1800 +30/-20% - 1605 32-130-45

F9

 3300 +30/-20% - 2940 32-130-36

 

 Core Parameters

 

Core Dimensions (mm)

A

B

C

D

E

F

G

29.40 -
30.80

14.80 -
15.20

6.80 -
7.30

9.20 -
9.70

19.50 -

20.30

6.80 -
7.20

29.60 -
30.40

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.12mm

-1

67.00mm

60.00mm²

-

4000.00mm³

EF 32

32-360-

EF 32

32-360-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.89mm

-1

74.31mm

83.16mm²

81.40mm²

6180.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 2135 +30/-20% - 1510 32-360-44

 

 Electrical Specification

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

12

59-360-66

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

Part Number

76-079-95

 

 Clips

 

Core Dimensions (mm)

A

B

C

D

E

F

G

31.30 -
32.90

15.80 -
16.40

8.80 -
9.50

11.20 -
11.80

22.70 -
23.70

8.90 -
9.50

31.60 -
32.80

E 34/8

32-010-

E 34/8

32-010-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.808mm

-1

62.50mm

77.40mm²

-

4840.00mm³

 

 Core Parameters

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F9

 4100 +30/-20% - 2640 32-010-36

F44

 2250 +30/-20% - 1450 32-010-44

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

-

59-010-66

 

Core Dimensions (mm)

A

B

C

D

E

F

G

33.26 -
35.02

13.05 -
13.16

7.63 -
8.12

8.28 -
8.78

23.86 -
25.32

10.81 -

11.45

26.10 -
26.32

E 34/14 

(US E375)

32-320-

E 34/14 

(US E375)

32-320-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.79mm

-1

69.17mm

87.96mm²

-

6084.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 2380 +30/-20% - 1490 32-320-44

F5A

 2890 +25/-25% - 1810 32-320-49

F9C

 4800 +30/-20% - 30200 32-320C36

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

34.16 -
35.20

14.27 -
14.53

9.02 -
9.52

9.53 -
9.77

25.02

    min.

9.27 -
9.53

18.54 -
19.06

E 41/9

32-020-

E 41/9

32-020-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.973mm

-1

102mm

105mm²

-

10,600mm³

 

 Core Parameters

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F9

 3750 +30/-20% - 2900 32-020-36

F44

 1875 +30/-20% - 1450 32-020-44

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

-

59-020-66

Two bobbins are required for each pair of E cores.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

39.72 -
42.28

22.22 -
22.33

8.70 -
8.98

16.21 -
17.19

28.00 -
29.10

11.54 -
11.98

44.44 -
44.66

E 41/16 

(US E21)

32-330-

E 41/16 

(US E21)

32-330-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.50mm

-1

77.23mm

153.00mm²

-

11841.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 3585 +30/-20% - 1425 32-330-44

F5A

 4375 +30/-20% - 1740 32-330-49

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

39.84 -
41.44

16.30 -
16.66

12.20 -
12.70

10.41 -
10.67

28.58

    min.

12.20 -
12.70

32.60 -
33.32

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

12

59-330-66

Two bobbins are required for each pair of E cores.

E 42/15

32-110-

E 42/15

32-110-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.54mm

-1

97.00mm

181.00mm²

175.00mm²

17600.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 3500 +30/-20% - 1490 32-110-44

F45

 3815 +30/-20% - 1625 32-110-45

F9C

 7700 +30/-20% - 3280 32-110C36

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

10

59-110-66

Horizontal

1

12

59-113-66

 

Core Dimensions (mm)

A

B

C

D

E

F

G

41.30 -
43.00

20.80 -
21.20

14.70 -
15.20

14.80 -
15.40

29.50 -
30.70

11.70 -

12.20

41.60 -
42.40

E 42/20

32-120-

E 42/20

32-120-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.41mm

-1

97.00mm

240.00mm²

232.00mm²

23300.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 4560 +30/-20% - 1470 32-120-44

 

 Electrical Specification

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

12

59-120-66

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

41.30 -
43.00

20.80 -
21.20

19.40 -

20.00

14.80 -
15.40

29.40 -
30.70

11.70 -

12.20

41.60 -
42.40

E 55/21

32-150-

E 55/21

32-150-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.35mm

-1

123.00mm

355.00mm²

350.00mm²

43700.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 5570 +30/-20% - 1550 32-150-44

F5A

 6366 +30/-20% - 1775 32-150-49

F9

 11040 +30/-20% - 3075 32-150-36

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

14

59-150-66

 

Core Dimensions (mm)

A

B

C

D

E

F

G

54.10 -
56.20

27.20 -
27.80

20.40 -
21.00

18.50 -
19.10

37.50 -

38.70

16.70 -
17.20

54.40 -
55.60

E 55/25

32-170-

E 55/25

32-170-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.29mm

-1

123.00mm

420.00mm²

420.00mm²

52000.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 6875 +30/-20% - 1585 32-170-44

F5A

 7600 +30/-20% - 1755 32-170-49

 

 Electrical Specification

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

14

59-170-66

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

54.10 -
56.20

27.20 -
27.80

24.40 -
25.00

18.50 -
19.10

37.50 -
38.70

16.70 -
17.20

54.40 -
55.60

E 65/27

32-240-

E 65/27

32-240-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.28mm

-1

147.00mm

532.00mm²

532.00mm²

78200.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 7430 +30/-20% - 1625 32-240-44

F5A

 10250 +30/-20% - 2240 32-240-49

F44

 470 

Approx. 

- 2.00 

±0.10 

mm 105 32-242-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

 Bobbins/Coil Formers

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

16

59-240-66

 

Core Dimensions (mm)

A

B

C

D

E

F

G

63.80 -
66.50

32.20 -
32.80

26.80 -
27.40

22.20 -
22.90

44.20 -
45.70

19.30 -

20.00

64.40 -
65.60

E 70/32

32-250-

E 70/32

32-250-

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

0.21mm

-1

146.00mm

697.00mm²

671.00mm²

101922.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Gap  Length

Eff. Permeability

Part Number

F44

 9060 +30/-20% - 1514 32-250-44

F5A

 11125 +30/-20% - 1860 32-250-49

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

 

Core Dimensions (mm)

A

B

C

D

E

F

G

68.65 -
70.35

32.00 -
32.50

31.42 -
32.08

21.24 -
21.74

47.63 -
49.13

21.78 -
22.48

64.00 -
65.00

EE 

Coilformers

59-XXX-

EE 

Coilformers

59-XXX-

No. of sections

Part No.

Type

Dimensions

‘X’

‘Y’

‘Z’

Winding Data

A

N  (mm²)

* Two coilformers required for a pair of E Cores. 32-020-XX

I

N  (mm)

Type H1

‘X’

‘Z’

‘Y’

‘P

L

’

‘P

O

’

‘X’

‘Z’

Type H3

59-140-64

H

1

17.50

17.50

11.80

25.0

30.0

Single

59-030-66

H

4

21.10

18.60

12.90

56.2

41.0

Single

59-031-66

H

1

24.00

18.90

19.90

52.3

41.8

Single

59-130-66

H

1

28.8

28.8

20.0

83.4

44.8

Single

59-010-66

H

4

23.60

20.30

16.20

73.4

55.3

Single

59-020-66*

H

4

27.70

24.90

16.0

97.3

61.2

Single

59-100-66

H

1

29.0

38.0

35.0

165.0

90.0

Single

59-113-66

H

3

29.0

39.7

38.6

180

88

Single

59-120-66

H

3

29.0

39.7

42.9

180

98

Single

59-150-66

H

3

37.0

44.7

47.4

280

110

Single

59-170-66

H

3

37.0

44.7

51.4

280

117

Single

59-240-66

H

3

40.0

52.6

55.9

414

134

Single

Material

No. of

Clip Part Number

P

1

P

2

P

3

P

L

Pin Details

P

0

* Fitted with rectangular tag 0.95 x 1.1mm
** Fitted with rectangular tag 0.6 x 1.1mm

Type H3

‘Y’

‘P

O

’

‘P

L

’

‘Z’

‘X’

‘Y’

‘P

2

‘

‘P

1

’

‘P

3

’

Type H4

8

0.85

5.0

20.0

15.0

3.50

Glass filled Phenolic

76-077-95

-

-

-

-

-

-

Glass filled Nylon 66

-

10

0.95*

5.08

20.32

15.24

5.0

G.F. Nylon 66 (VO)

-

12

0.95*

5.00

25.0

25.0

5.0

G.F. Nylon 66 (VO)

-

-

-

-

-

-

-

G.F. Nylon 66

-

-

-

-

-

-

-

G.F. Nylon 66

-

10

1.10**

5.00

20.0

35.0

10.5

G.F. Nylon 66

-

12

Sq.0.70

5.08

25.40

35.56

4.1

G.F. Nylon 66 (VO)

-

12

Sq.0.70

5.08

25.40

35.56

4.1

G.F. Nylon 66 (VO)

76-069-95

14

Sq.0.70

5.08

30.48

40.64

4.5

G.F. Nylon 66 (VO)

76-069-75

14

Sq.0.70

5.08

30.48

40.64

4.5

G.F. Nylon 66 (VO)

76-069-75

16

Sq.1.0

5.08

35.56

45.72

4.5

G.F. Nylon 66 (VO)

-

EF 

Coilformers

59-XXX-

EF 

Coilformers

59-XXX-

No. of sections

Part No.

Type

Dimensions

‘X’

‘Y’

‘Z’

Winding Data

A

N  (mm²)

I

N  (mm)

59-200-66

H

1

12.70

12.70

9.60

11.6

24.0

Single

59-201-66

H

1

12.70

12.70

9.60

10.8

24.0

Double

59-205-76

SMD

13.00

18.00

8.90

12.0

30.6

Single

Type H

1

‘X’

‘Z’

‘Y’

‘P

L

’

‘P

O

’

‘X’

Type V

1

‘Z’

‘P

L

’

59-206-76

SMD

13.00

18.00

8.90

11.2

30.6

Double

59-370-66

H

1

13.10

16.00

11.10

21.6

33.0

Single

59-371-66

H

1

13.10

16.00

11.10

20.10

33.0

Double

59-375-66

V

1

11.10

11.10

16.00

21.6

33.0

Single

59-376-66

V

1

11.10

11.10

16.00

20.1

33.0

Double

59-180-66

H

1

20.00

20.00

15.50

34.8

39.0

Single

59-181-66

H

1

20.00

20.00

15.50

32.1

39.0

Double

59-185-66

V

1

13.90

13.90

16.80

34.8

39.0

Single

59-186-66

V

1

13.90

13.90

16.80

32.1

39.0

Double

59-190-66

H

1

27.00

24.10

19.10

56.4

48.0

Single

59-191-66

H

1

27.00

24.10

19.10

53.1

48.0

Double

59-196-64

V

1

17.20

17.20

20.80

56.4

52.0

Single

59-360-66

H

1

32.00

29.40

23.70

96.9

60.0

Single

59-361-66

H

1

32.00

29.40

23.70

92.4

60.0

Double

59-365-66

V

1

22.20

22.20

27.20

96.9

600

Double

Material

No. of

Clip Part Number

P

1

P

2

P

3

P

L

Pin Details

P

0

* Rectangular wire 0.66 x 0.45mm
** Rectangular wire 0.88 x 0.60mm
† Tag 0.95 x 0.45mm

Type V

1

‘Z’

‘X’

‘Y’

‘P

2

‘

‘P

1

’

‘P

3

’

‘P

0

‘

Type SMD

‘Y’

‘P

O

’

6

0.66*

5.08

10.16

10.16

5.50

G.F. Nylon 66 (VO)

76-075-95

6

0.66*

5.08

10.16

10.16

5.50

G.F. Nylon 66 (VO)

76-075-95

10

0.45*

2.54

10.16

16.20

-

PPS (VO)

76-075-95

10

0.45*

2.54

10.16

16.20

-

PPS (VO)

76-075-95

6

0.66*

5.00

10.00

12.50

5.50

G.F. Nylon 66

76-076-95

6

0.66*

5.00

10.00

12.50

5.50

G.F. Nylon 66

76-076-95

6

0.66*

3.75

7.50

7.50

5.50

G.F. Nylon 66

76-076-95

6

0.66*

3.75

7.50

7.50

5.50

G.F. Nylon 66

76-076-95

8

0.66*

5.00

15.0

15.0

3.50

G.F. Nylon 66

76-077-95

8

0.66*

5.00

15.0

15.0

3.50

G.F. Nylon 66

76-077-95

6

0.66*

5.00

10.0

10.0

5.00

G.F. Nylon 66

76-077-95

6

0.66*

5.00

10.0

10.0

5.00

G.F. Nylon 66

76-077-95

10

0.95†

5.08

20.32

20.32

5.20

G.F. Nylon 66 (VO)

76-078-95

10

0.95†

5.08

20.32

20.32

5.20

G.F. Nylon 66 (VO)

76-078-95

6

0.85

5.08

10.16

12.70

9.00

G.F. Phenolic

76-078-95

12

0.88**

5.08

25.40

25.40

3.50

G.F. Nylon 66

76-079-95

12

0.88**

5.08

25.40

25.40

3.50

G.F. Nylon 66

76-079-95

6

0.88**

7.50

15.0

15.0

5.0

G.F. Nylon 66

76-079-95

Planar E Cores

E 14/3.5/5 

32-

9140

-

E 18/4/10 

32-

9180

-

E 22/6/16 

32-

9210

-

E 32/6/20 

32-

9320

-

E 38/8/25 

32-

9380

-

E 64/10/50 

32-

9640

-

Planar E Series

Components

Planar E Series

Components

Planar E Cores

Many next generation electronics equipment will use switched mode power supplies where the
voltage transformation unit is integrated on a circuit card. As cards may be racked with minimal
clearances, low profile components are necessary. Planar assemblies differ radically from
conventional transformers as wire windings are replaced by stacks of flat spiral laminations. In some
cases the winding can be replaced by printing circuit tracks, with the E core inserted through the
board. The planar E core’s low profile shape and ease of construction offers significant advantages
including: Fast error-free winding; excellent heat sinking properties and efficient repeatable
performance at low cost.

EE Pair

EI Pair

Planar Magnetic Devices

Planar technology stems from the demand for
reduction in size, weight and profile of switching
power supplies. These can be achieved by
increasing the switching frequency of the device
allowing the reactive components - capacitors and
wound cores to be smaller. On the magnetic design
side, it also decreases the number of turns required
of the winding reducing copper loss and
magnetising current.
The design of the planar core range helps overcome
many of the problems associated with high
frequency transformers, including the hysteresis
and eddy current losses in the material, and the skin
effect and proximity losses of the winding. The main
losses have been reduced by the development of
high frequency power materials, F44 and F47 that
together cover the range 100kHz - 1MHz.
Planar magnetics do not rely on the traditional wire
wound bobbins but substitute the precision and
repeatability of printed circuit technology.

Planar Design

The utilisation of skin depth or current penetration in
the copper conductor at high frequencies is the key
to planar design.
The relationship between skin depth (penetration)
and frequency is:

where:

f = frequency (Hz)
k = thermal constant (72 at 70°C)

At 100kHz, D = 0.228mm which drops to 0.1mm at
500kHz.

Multi-layer PCB technology can closely control the
track width and height, helping to optimise this
relationship. For high current densities a number of
track layers can be assembled in parallel. Proximity
and eddy current losses are also reduced by utilising
the track thickness. Planar construction onto PCB’s
can be top mounting or through-board.

Key to Design Terminology

Thermal

Thermal resistance is defined as the

Resistance

temperature in degrees Celcius per
Watt of power dissipated in the
core. It can be used to determine
the approximate power loss in the
core for a given temperature rise ie.
for a given 

∆

T and power loss

density, core volume required can
be calculated.

R

th

 = 23 x AP

-0.37

where AP = A

e

 x A

W

(see ‘Area Product’ below)

Flux Density

The current that passes through the
winding induces a magnetic field,
expressed in Tesla, within the core
material. The voltage across a
winding is related to the flux density
by:

where, N = No. of turns.

Power Loss

Sometimes abbreviated to PLD, this

Density

is the total material losses at a given
frequency and flux density divided
by the volume of ferrite.

PLD = Total loss/Effective Volume,V

e

also,

Total Power Loss(W) =

Temp. rise/Thermal Resistance

So for a given temperature in the
transformer, a core size can be
selected (assuming that losses are
split equally between the winding
and the core).
Power loss can be approximated for
a required frequency and flux
density by the Steinmetz equation:

PLD = k x f

1.62

 x B

2.3

where, k is derived from the power
loss data (206 x 10

-6

 for F44 at

100°C)
This is an emperical estimation and
cannot be claimed to hold over a
wide range of conditions and core
sizes.

B = 

√

2x

π

xNxA

e

xf

V

rms

D = 

√

f

k

Area Product

This is the relationship between
winding area, A

W

 and core cross-

sectional area, A

e

.

AP = A

e

 x A

w

  (cm

4

)

This factor affects the current
density, J

p(max)

 in the primary

windings.

J

P(max)

 = 450 x AP

-0.125

(empirically derived)

By knowing the current density, the
required wire area can be found
using:

Axp = I

(max)

 / J

P(max)

   (m²)

But due to the skin effect at high
frequencies, as discussed earlier,
the cross-sectional area of the
copper strands can be reduced. In
conventional transformer design the
primary would be made up from
multi-strand wire. In planar design,
this would equate to multi-layer
boards with the reduced track
thickness. For high currents, boards
can be connected in parallel. The
secondary copper cross-section can
be calculated from the secondary
current.

  (Amps)

and the cross-section from:

A

XS

 = I

S

 / J

P(max)

The track size can then be calculated
as above.
Another empirically derived
relationship is that with frequency,
flux density and input power.

where:
k = circuit topology factor.

(0.141 for Half Bridge, 0.2 for flyback)

From this the power handling
capability for each core can be
found. However, as with
conventional transformers the
insulation between the windings and

associated creepage distance
reduces the winding area, AW,
which in turn reduces the core
power handling level.

Creepage

The distance between the outer and

Distance

inner most winding of the primary or
secondary and the corresponding
turns of the next set of windings
(typical values, 2 & 4mm).

Core

l

e

 =

Effective magnetic path length

Parameters

(mm).

A

e

 = Effective magnetic area (mm²).

V

e

 = Effective magnetic volume

(mm³).

C

1

 = Core constant 

Σ

l 

/A (mm

-1

).

Inductance

Used to calculate the inductance for

Factor, A

L

a given number of turns (in nano-
Henrys).

Core Type

Thermal

Area

Power

Resistance

Product

Rating*

R

th

 (°C/W)

(cm

4

)

(W)

EE 14/3.5/5

92.6

0.02

20

EI 14/3.5/5

120.0

0.01

10

EE 18/4/10

58.8

0.08

40

EI 18/4/10

76.0

0.04

20

EE 22/6/16

32.6

0.30

120

EI 22/6/16

46.6

0.15

60

EE 32/6/20

25.4

0.77

280

EI 32/6/20

32.9

0.38

140

EE 38/8/25

17.3

1.93

640

EI 38/8/25

23.2

0.98

320

EE 64/10/50

9.4

11.30

2600

EI 64/10/50

12.1

5.66

1300

Typical Values for Planar E & I Cores

* Assuming power out is 90% of input power and fx

∆

B = 20x10³

for a flyback circuit.

I

s 

= 

√

2

I

0(max)

AP =

[

kx

∆

Bxf

]

1.143

11.1xP

in

E 14/3.5/5

32-9140-

E 14/3.5/5

32-9140-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

13.70 -
14.30

3.40 -
3.60

4.80-
5.10

10.75 -

11.25

2.75 -
3.05

1.90 -
2.20

1.45 -
1.55

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

1.43mm

-1

20.70mm

14.50mm²

-

300.00mm³

EI Pair

1.16mm

-1

16.70mm

14.50mm²

-

240.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 1100 +25/-25% 1250 32-9140-47 -

E + I Pair

F47

 1300 +25/-25% 1200 32-9140-47 33-9140-47

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

EE Pair

EI Pair

E 18/4/10

32-9180-

E 18/4/10

32-9180-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

17.65 -

18.35

3.90 -
4.10

9.80 -

10.20

13.70 -
14.30

3.80 -
4.10

1.90 -
2.20

1.90 -
2.10

EE Pair

EI Pair

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

0.62mm

-1

24.30mm

39.50mm²

-

960.00mm³

EI Pair

0.51mm

-1

20.30mm

39.50mm²

-

800.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 2700 +25/-25% 1330 32-9180-47 -

E + I Pair

F47

 3100 +25/-25% 1260 32-9180-47 33-9180-47

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

E 22/6/16

32-9210-

E 22/6/16

32-9210-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

21.40 -
22.20

5.60 -
5.80

15.50 -
16.10

16.40 -
17.20

4.70 -
5.10

3.10 -
3.40

2.45 -
2.55

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

0.41mm

-1

32.50mm

78.50mm²

-

2550.00mm³

EI Pair

0.33mm

-1

26.10mm

78.50mm²

-

2040.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 4300 +25/-25% 1405 32-9210-47 -

E + I Pair

F47

 5000 +25/-25% 1315 32-9210-47 33-9210-47

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

EE Pair

EI Pair

E 32/6/20

32-9320-

E 32/6/20

32-9320-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

31.11 -
32.39

6.22 -
6.48

19.91 -

20.73

24.90 -
25.90

6.12 -
6.48

3.08 -
3.38

3.05 -
3.31

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

0.32mm

-1

41.70mm

129.00mm²

-

5380.00mm³

EI Pair

0.28mm

-1

35.90mm

129.00mm²

-

4560.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 5900 +25/-25% 1500 32-9320-47 -

E + I Pair

F47

 6780 +25/-25% 1510 32-9320-47 33-9320-47

E + E Pair

F44

 6425 +25/-25% 1635 32-9320-44 -

E + I Pair

F44

 7350 +25/-25% 1635 32-9320-44 33-9320-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

EE Pair

EI Pair

E 38/8/25

32-9380-

E 38/8/25

32-9380-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

37.34 -
38.86

8.13 -
8.39

24.89 -
25.91

30.25 -
31.45

7.40 -
7.80

4.32 -
4.72

3.68 -
3.94

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

0.27mm

-1

52.60mm

194.00mm²

-

10200.00mm³

EI Pair

0.23mm

-1

43.70mm

194.00mm²

-

8460.00mm³

 

 Core Parameters

In accordance with IEC Document 60205.

EE Pair

EI Pair

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 7250 +25/-25% 1550 32-9380-47 -

E + I Pair

F47

 8500 +25/-25% 1555 32-9380-47 33-9380-47

E + E Pair

F44

 7940 +25/-25% 1705 32-9380-44 -

E + I Pair

F44

 9290 +25/-25% 1700 32-9380-44 33-9380-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

E 64/10/50

32-9640-

E 64/10/50

32-9640-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

62.50 -
65.10

10.07 -
10.33

49.30 -
51.30

52.50 -
54.70

10.00 -
10.40

4.97 -
5.23

4.95 -
5.21

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

EE Pair

0.16mm

-1

79.70mm

511.00mm²

-

40700.00mm³

EI Pair

0.14mm

-1

69.60mm

511.00mm²

-

35500.00mm³

 

 Core Parameters

Material

A

L

 Value

Tolerance

Eff. Permeability

Part No. E Core

Part No. I Bar

E + E Pair

F47

 12720 +25/-25% 1620 32-9640-47 -

E + I Pair

F47

 14360 +25/-25% 1600 32-9640-47 33-9640-47

E + E Pair

F44

 13300 +25/-25% 1695 32-9640-44 -

E + I Pair

F44

 15050 +25/-25% 1675 32-9640-44 33-9640-44

 

 Electrical Specification

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.

In accordance with IEC Document 60205.

EE Pair

EI Pair

EFD Cores and Accessories

Low Profile Components

EFD 15 

32-

720

-

EFD 20 

32-

740

-

EFD 25 

32-

760

-

EFD Series

Components

EFD Series

Components

EFD Cores

EFD (

E

conomical

 F

lat

 D

esign) cores have been developed in recent years to meet the increasing

demand for low profile components in power transformer design. A combination of very low height
and excellent throughput power, when compared to other cores of a similar height,  make these
cores ideal where space considerations are a priority.

EFD Cores are available in a range of sizes and materials together with their associated coilformers
and clips.

Clip

EFD Core

Coilformer

EFD Core

Clip

EFD 15

32-720-

EFD 15

32-720-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

H

14.60 -
15.40

7.35 -
7.65

4.50 -
4.80

10.65 -
11.35

5.25 -
5.75

2.30 -
2.50

5.15 -
5.45

0.20

     Ref

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

2.27mm

-1

34.00mm

15.00mm²

12.20mm²

510.00mm³

 

 Core Parameters

 

 Electrical Specification

 

 Bobbins/Coil Formers

 

 Clips

Part Number

76-070-95

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.
*A

L

 Value shown is obtained when tested with an ungapped half core of the same grade.

In accordance with IEC Document 60205.

Material

A

L

 Value

Tolerance

Gap Length

Eff. Permeability

Part Number

F47

 650 +30/-20% - 1175 32-720-47

F44

 675 +30/-20% - 1220 32-720-44

F45

 780 +30/-20% - 1410 32-720-45

F44

 164 +15/-15% 0.10 

Approx. 

295 32-721-44

F47

 164 +15/-15% 0.10 

Approx. 

295 32-721-47

F44

 100 +10/-10% 0.17 

Approx. 

180 32-722-44

F47

 100 +10/-10% 0.17 

Approx. 

180 32-722-47

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

8

59-720-76

EFD 20

32-740-

EFD 20

32-740-

 

Core Dimensions (mm)

A

B

C

D

E

F

G

H

19.45 -

20.55

9.85 -

10.15

6.50 -
6.80

14.90 -
15.90

7.45 -
7.95

3.45 -
3.75

8.70 -
9.10

0.17

     Ref

Parameter

Σ

l 

/A

Effective Length

Effective Area

Minimum Area

Effective Volume

Symbol

C

1

l

e

A

e

A

min

V

e

Value

1.52mm

-1

47.00mm

31.00mm²

29.00mm²

1460.00mm³

 

 Core Parameters

 

 Electrical Specification

 

 Bobbins/Coil Formers

 

 Clips

Part Number

76-071-95

Part numbers refer to half cores. Other material grades and gap lengths may be available on request.
*A

L

 Value shown is obtained when tested with an ungapped half core of the same grade.

In accordance with IEC Document 60205.

Material

A

L

 Value

Tolerance

Gap Length

Eff. Permeability

Part Number

F47

 1075 +30/-20% - 1300 32-740-47

F44

 1120 +30/-20% - 1355 32-740-44

F45

 1200 +30/-20% - 1450 32-740-45

F44

 160 +10/-10% 0.20 

Approx. 

195 32-741-44

F47

 160 +10/-10% 0.20 

Approx. 

195 32-741-47

F44

 100 +10/-10% 0.35 

Approx. 

120 32-742-44

F47

 100 +10/-10% 0.35 

Approx. 

120 32-742-47

Mounting

No. of Sections

Pins

Part Number

Horizontal

1

8

59-740-76