●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

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

Members that do not corrode or react.

2

Members with coefficients of thermal expansion as close

as possible to ferrite.

3

Members that do not add thermal shock (such as casting

chemicals).

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

core, make sure to provide extensive warnings and instructions

to the user so they will not get shocked or burned by touching the

core.

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.

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).

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.

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.

Ferrite Cores VOL.05

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