5. Cleaning
Precautions
◆Cleaning conditions
1. When cleaning the PC board after the Inductors are all mounted, select the appropriate cleaning solution according to the type of flux
used and purpose of the cleaning（e.g. to remove soldering flux or other materials from the production process.）
2. Cleaning conditions should be determined after verifying, through a test run, that the cleaning process does not affect the inductor's
characteristics.
◆Cleaning conditions
1. The use of inappropriate solutions can cause foreign substances such as flux residue to adhere to the inductor, resulting in a degradation
of the inductor's electrical properties（especially insulation resistance）.
2. Inappropriate cleaning conditions（insufficient or excessive cleaning）may detrimentally affect the performance of the inductors.
In the case of ultrasonic cleaning, too much power output can cause excessive vibration of the PC board which may lead to the cracking
of the inductor or the soldered portion, or decrease the terminal electrodes' strength. Therefore, the following conditions should be
carefully checked;
Technical
considerations
Ultrasonic output
20W/ℓ or less
40kHz or less
5 min. or less
Ultrasonic frequency
Ultrasonic washing period
6. Resin coating and mold
1. With some type of resins a decomposition gas or chemical reaction vapor may remain inside the resin during the hardening period or while
left under normal storage conditions resulting in the deterioration of the inductor's performance.
2. Thermal expansion and thermal shrinkage characteristics of resins may lead to the deterioration of inductors’ performance.
3. When a resin hardening temperature is higher than inductor operating temperature, the stresses generated by the excessive heat may
lead to damage in inductors.
Precautions
7. Handling
◆Breakaway PC boards（splitting along perforations）
1. When splitting the PC board after mounting inductors and other components, care is required so as not to give any stresses of deflection
or twisting to the board.
2. Board separation should not be done manually, but by using the appropriate devices.
◆General handling precautions
・Always wear static control bands to protect against ESD.
・ Keep the inductors away from all magnets and magnetic objects.
・ Use non-magnetic tweezers when handling inductors.
Precautions
・ Any devices used with the inductors（ soldering irons, measuring instruments） should be properly grounded.
・ Keep bare hands and metal products（i.e., metal desk）away from inductor electrodes or conductive areas that lead to chip electrodes.
・ Keep inductors away from items that generate magnetic fields such as speakers or coils.
◆Mechanical considerations
Be careful not to subject the inductors to excessive mechanical shocks.
（1） If inductors are dropped on the floor or a hard surface they should not be used.
（2） When handling the mounted boards, be careful that the mounted components do not come in contact with or bump against other
boards or components.
8. Storage conditions
◆Storage
To maintain the solderability of terminal electrodes and to keep the packaging material in good condition, care must be taken to control
temperature and humidity in the storage area. Humidity should especially be kept as low as possible.
・Recommended conditions
Precautions
Ambient temperature: 30℃ or below
Humidity: 70% RH or below
The ambient temperature must be kept below 40℃. Even under ideal storage conditions, solderability of inductor is deteriorated as time
passes, so inductors should be used within 6 months from the time of delivery.
・Inductor should be kept where no chlorine or sulfur exists in the air.
◆Storage
Technical
If the parts are stocked in a high temperature and humidity environment, problems such as reduced solderability caused by oxidation of
terminal electrodes and deterioration of taping/packaging materials may take place. For this reason, components should be used within 6
months from the time of delivery. If exceeding the above period, please check solderability before using the inductors.
considerations
▶ This catalog contains the typical specification only due to the limitation of space. When you consider the purchase of our products, please check our specification.
For details of each product (characteristics graph, reliability information, precautions for use, and so on), see our Web site (http://www.ty-top.com/) .
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