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Precautions for Use of
Inductors |
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Please refer to precautions for use in the beginning
part for particulars common to all product types. |
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Precautions
for Use of Inductors |
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Inductors in General |
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The characteristics of L/Q values etc. of inductors
have the characteristics of frequency dependence. Confirm L/Q values
etc. by the frequency for use on the actual machine. |
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In case of resin coating/potting or molded sealing,
fully confirm the evaluation of reliability and use those that have
small contractile stress at a resin stiffening time because the
protection coat of the inductor may be peeled off by the stress
at the resin stiffening time, cracks may occur at the solder connection,
inductance value may change or disconnection may occur. Take care
especially for urethane sealing compounds because they are apt to
adsorb humidity and may cause an electric erosion. |
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Pay attention to that the magnetic characteristics
of the core and inductance may be changed by the stress of molded
sealing. |
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Keep the inductors away from magnetic tweezers
or magnets because magnetization may change the inductance. For
prevention of disconnection, the wire wound portion of the chip
inductor should not be touched by sharp things like tweezers etc. |
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Please confirm before use because there is a risk of disconnection
(open), when excessive current (inrush current) is flown
by the occurrence of the transition phenomenon in the circuit of
the electric charge and discharge. Also confirm taking the dispersion
of the constants of other components on the actual circuit into
the consideration. Inquire of us attaching the circuit diagram and
waveform of the current when you are uncertain. |
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Precautions
for Use of Chip Inductors |
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Soldering |
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Solder by reflowing at a 240
peak 2 times or less. Ask us if 3 times or more are needed. |
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Solder at the shortest possible time if a soldering
iron is used. |
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For non-mold type inductors, during and after
soldering, take care not to give mechanical stress on the wound
wire and flat top film. |
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When mounting, do not give an excessive shock
or strong force to inductors as it may change electricity and magnetic
characteristics of inductors. |
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Some high frequency inductors have polarity
in the characteristics of inductors. When mounting, those directions
must be arranged. |
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As chip inductors are of open-magnetic constructions,
other components, chassis, substrate constructions, patterns, etc.
may affect them to change L and Q. When high density mounting is
applied, check the characteristic in advance on the actual conditions.
Further, take care of positioning components as small spaces between
inductors may cause magnetic interference. Do not place big magnetic
materials like audio speakers etc. around the inductors. |
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Do not give inductors heat radiation from other
high temperature parts. |
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Ultrasonic washing is based on within 5 minutes
at 20W/
or lower. Check it with actual equipment in advance as vibration
levels and mode vary with washing equipment. |
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Do not use acid and alkali for cleaning solvents.
Consult with us in advance about cleaning solvents made from substitute
CFC and water systems as some of them may deteriorate inductor characteristics. |
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For ultrasonic cleaning of KL73, use volatile
detergents such as isopropyl alcohol, methyl alcohol, etc. |
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Do not use inductors in an atmosphere filled
with corrosive gas such as chlorine, sulfide, acid, etc. |
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Keep inductors away from all magnets and magnetic
objects (magnetic body metal tweezers) and equipment generating
magnetic field (audio speakers). |
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In bulk storage, take care to avoid chipping
core or disconnection caused by rubbing each other. |
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Store inductors indoor without drastic temperature
changes, away from direct sun rays, high temperature/humidity, magnetic
field, vibration, dust, and corrosive gas (sulfide, chlorine, acid)
that may deteriorate solderability and taping strength. |
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After placement, be sure to earth the equipment
that measures the circuit with inductors assembled, etc. and to
use a wrist band at the operation. |
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Quality factor is shouing the quality of a coil and
asks by the below formula.
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Precautions
for Use of Leaded Inductors |
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Soldering |
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Solder at not more than 260
within 10 sec. |
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During and after soldering, take care not to
give mechanical stress on lead wires. |
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When using a soldering iron, do not directly
touch the tip of the iron to lead wires to heat. |
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Placement (Automatic insertion) |
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Insert the parts at the center of the PWB holes. |
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During insertion, take care not to cause chucking
or driving damage on the parts. |
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Do not use inductors that once fall down as
electrical and magnetic characteristics of ferrite cores may change
when excessive stress or impact is given. |
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Do not have inductors contacted with other components
to avoid capacitive coupling, magnetic interference, and magnetic
combining with other inductors. |
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Keep away from heat radiation from other high
temperature parts. |
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Ensure open space and insulation distance from
high-voltage components and power supplies, conforming to applicable
safety regulations. Take special care of contacts with lead wires
of different potentials. |
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Keep away from a metal board in order to avoid
the influence on electrical characteristics. |
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Mount in such a way that inductors do not rise
out of the board. |
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When using parts feeders, check beforehand the
influence of the magnetic field on core. |
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When bending lead wires during forming, take
care to ensure the straight part of the lead and never give excessive
mechanical stress on the base of the lead wires. |
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Ultrasonic washing should be based on within
5 minutes at 20W/
or lower. An excessive power may generate sympathetic vibration
of the board that may cause disconnection and/or terminal strength
deterioration. |
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Do not use acid and alkali for cleaning solvents.
Consult with us in advance on cleaning agents made from CFC and
water-system as some of them may spoil the inductor characteristics. |
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Do not pile individual inductors in bulk or
mountain-high. |
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Store inductors indoor without drastic temperature
changes, away from direct sun rays, high temperature/humidity, magnetic
field, vibration, dust, and corrosive gas (sulfide, chlorine, acid)
that may deteriorate soldering strength. |
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Application Notes
Brush up your circuit
Basic Knowledge
