●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9603FERVOL05E1001T0
CONTENTS
INTRODUCTION
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥3
Precautions Before Use
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥4
Notes on Design
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥4
Notes of Caution on Handling and Usage
‥‥‥‥‥‥‥‥‥‥‥‥5
Terms and Definitions
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥6
High-B Compound Standard Material Characteristics
‥‥‥‥‥‥‥‥9
High-
μ
Compound Standard Material Characteristics
‥‥‥‥‥‥‥‥12
E Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥13
FEI-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥14
FEE-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥15
E-Type Bobbins
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥17
FEER Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥18
FEER-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥19
FEER-Type Bobbins
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥20
FPQ Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥21
FPQ-Type Cores‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥22
FPQ-Type Bobbins
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥23
FQK Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥24
FQK-Type Cores‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥25
FQK-Type Bobbins
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥26
FEP Type Ferrite Cores‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥27
FEP-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥27
P Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥28
P-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥28
RM Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥29
RM-Type Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥29
FUU Type Ferrite Cores
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥30
FUU-Type Cores‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥30
Toroidal Cores‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥31
BH2 Compound Technical Data
‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥33
Ferrite Cores VOL.05
2
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9603FERVOL05E1001T0
INTRODUCTION
Because soft ferrite, such as MOFe
2
O
3
(M:bivalent metal), in the high-frequency range has high
magnetic permeability, a large degree of saturation magnetic flux and large characteristic
resistance compared to metallic magnetic materials, it is extremely populer as a high-
frequency compound.
As switching power supplies rapidly become more compact and thinner, requirements for ferrite
as a high-frequency transformer material are becoming increasingly stringent.
To meet these demands, NEC TOKIN has enhanced its lineup of ferrite cores by adding the
BH1 and BH2 types (-300 kHz) which feature improved core loss over the B25 type (-300
kHz), and B40 (500 kHz -1 MHz) with improved core loss in high frequencies.
Further, the requirements of larger power supply capacities, increasing thinness and high
density mounting are met by the E,FPQ, FEP, FEER and FQK Series, as well as the
surface-mounting FEY Series.
●E
type cores
This series features 46 shapes and sizes from FEI 12.5 to
FEE60W, standard-equipped with accessories for accommo-
dating different transformer specifications.
●FPQ
type cores
This series features eight shapes and sizes suitable for high
density mounting.
●FEER
type cores
This series features 19 shapes and sizes with greater winding
cross-sectional area than the E and FPQ types.
●FEY
type cores
This series features htree shapes and sizes suitable for ultra
high-density mounting.
Ferrite Cores VOL.05
3
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9603FERVOL05E1001T0
Precautions Before Use
Notes on Design
1) When selecting the material and shape for the ferrite core,
strictly observe the limits given in the catalog (product manual)
regarding such things as the L value, maximum saturation, mag-
netic flux density, and core loss.
3
12) Take note of the following information when selecting mem-
bers (bobbin, metal fittings, tape, adhesives, saturants, and coat-
ings) to use in combination with the ferrite core.
1
2
Members that do not corrode or react.
Members with coefficients of thermal expansion as close
as possible to ferrite.
Members that do not add thermal shock (such as casting
chemicals).
2) Select a ferrite core having temperature and frequency proper-
ties for the core loss that meet the demands of the equipment to
be used.
3) Abnormal heat release may result if used under high frequen-
cies or in strong magnetic fields. Select a ferrite core that has the
appropriate properties such as a low core loss.
4) In an environment where the Curie point is exceeded, the fer-
rite core may lose its intrinsic properties, causing the equipment
to malfunction. Use only in a temperature range that stays below
the Curie point.
5) Give careful consideration to the balance of the ferrite core's
thickness when designing a shape.
6) When designing a bobbin, set measurements and select bob-
bin materials that meet the requirements (frame class, thickness,
HWI, HAI, HVTR, CTI, and D495) of safety standards such as
UL.
7) Working on the coil could destroy the ferrite core owing to the
coil's thickness or damage the coil itself, so designs should pro-
vide adequate clearance between the core and coil.
8) For inserting the ferrite core into a case, designs should pro-
vide adequate clearance between the core and case. The core
may break unnecessary force is applied.
9) The insulation resistance of the ferrite core is not high. Do not
use it as an insulator. Also, do not use it for other purposes (such
as electrical circuit element).
4
Members that can withstand transformer heat genera
tion, and particularly those that do not were down wires.
13) The coefficients of thermal expansion for the ferrite core and
bobbin differ greatly. Securing the core and bobbin with satu-
rants and adhesives will cause the bobbin to expand from heating
when the adhesive hardens or heat release during operation.
This will place stress on the core, possibly causing it to break.
Allow sufficient clearance between the core and bobbin.
14) When there is unbalance from a circuit being split two or
more times, the flux will concentrate on the side where the flow is
the easiest and may result in abnormal heating and even fire.
15) When a bifilar wiring is made by, for example, a wire con-
tainer, and the wire gage and length is different or the number of
coils are different, the electrical current will tend to flow in only the
easiest way, resulting in heating and fire.
16) Designs should keep abnormal current resulting from a prob-
lem in another circuit from flowing into the transformer.
17) When used as a transformer, heat will be released. Designs
should ensure that surrounding parts will not deteriorate or be
destroyed by that heat.
18) Regarding equipment where the user is able to touch the
10) For ferrite cores that have low resistivity such as Mn-Zn
cores, make sure to provide sufficient insulation with insulation
protection covers and tape, etc.
11) When resins such as adhesives, saturants, and coatings are
used, excessive stress may arise in the ferrite core owing to the
difference in coefficients of thermal expansion, resulting in the
core breaking. It is best not to use such resins, but if their use
cannot be avoided, use one with a coefficient of thermal expan-
sion that is close to that of the core. In addition, select non-corro-
sive resin for the core and members to be used.
Ferrite Cores VOL.05
core, make sure to provide extensive warnings and instructions
to the user so they will not get shocked or burned by touching the
core.
19) Since leakage flux may cause equipment to malfunction,
check in advance for its effects on the equipment you are using
and ueardy equipment, and then take the appropriate actions.
4
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9603FERVOL05E1001T0
Notes of Caution on Handling and Us-
age
1) The ferrite core is a sinter. Make sure to handle it carefully as
it has low tolerance for impact such as being knocked or dorpped,
which may cause it to break or chip. Using it without realizing that
it is broken will result in degradation of its properties and heat
release. In addition, chipped fragments may result in injury or
even get into the eye.
12) The ferrite core should be kept away from rapid temperature
changes, corrosive gases, dust, and humidity. Care should also
be taken to isolate it from vibration when transporting and storing
it.
13) Impact may cause the inductance of ferrite cores to change.
14) If the ferrite core is magnetized once by a strong magnet, it
may lose its prescribed properties.
15) If the ferrite core is used for a coil, wrap the wire with the
2) The ferrite core is a magnetic substance. When there is a
strong magnet nearby, the core will be quickly attracted to it, and
there is the possibility that the core will be destroyed by the im-
pact. There is also the danger that a finger or the like may be
crushed between the two.
3) The ground surface of the ferrite core has sharp edges be-
cause it is not beveled so as to prevent decreased performance.
In addition, there may be a minute amount of burr. Carelessly
touching it may lead to injury.
4) Do not apply force to the ferrite core beyond the prescribed
amount. Otherwise, the core may break or chip the core.
5) Do not allow the ferrite core and jigs or two cores to collide.
Failing to observe this may destroy the core(s).
6) When securing the ferrite core, do not apply stress beyond the
necessary amount. Failing to observe this may break or chip the
core, reducing its properties.
tension appropriate for the core's thickness and the tapering
shape. Applying tension beyond the prescribed amount when
wrapping the coil may break or chip the core.
16) When the ferrite core is directly used for a coil, the wire may
be damaged by the burr on the core's surface, resulting in a short
circuit. Select a core that has had its burr removed or has been
coated.
17) When the ferrite core is directly used for a coil, the wire may
be damaged by tension or friction, resulting in a short circuit. The
wire may also be damaged by kinks or the jigs and tools used
when adjusting the transformer. Take adequate care when per-
forming work.
18) When wrapping a coil or during assembly, adjust the equip-
ment so that the core is not struck hard and no excessive stress is
applied, and make sure to handle it as delicately as possible.
19) The ferrite core should not be placed in the mouth. Make
7) Do not expose the ferrite core to rapid temperature extremes
(thermal shock). Failing to observe this may break or chip the
core.
8) When performing molding or such, the core may break or chip
on account of rapid changes in humidity and expansion differ-
ences between resins. Carefully evaluate the materials you
iutend using.
9) There are some ferrite cores that are heavy. Packing boxes
may fall over if stacked too high. Limit the height when stacking
them.
10) There are some ferrite cores that are heavy.
When
sure to keep it away from young children.
20) Use the ferrite core under normal temperatures and in nor-
mal surroundings.
21) If core fragments or other debris get in the ferrite core's
ground surface, inductance will lower and howling will result.
22) When cutting the ferrite core, take measures to prevent injury
such as providing a cover or protector so that debris and chips
will not fly in all directions. In addition, note the following informa-
tion to prevent the core from breaking or chipping.
1
Select a grindstone with the properties for the core's quali
ties.
movingtheir packing boxes, take due care to prevent injury or
backache.
11) Since there is the possibility of damage by vibration, falling,
or other sources of physical shock when transporting ferrite cores
and transformers that use these cores, take care to provide ad-
equate packing to prevent such damage.
2
Adjust cooling agents and their conditions (amount, tem
perature, and quality).
3
For shapes that require a large amount of grinding, do not
grind all at once. Instead, grind a little bit at a time.
4
Use an exhaust system to prevent the aspiration of dust
produced when cutting the ferrite core.
Ferrite Cores VOL.05
5
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
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