
Power Inductors
(Common precautions for Power Choke Coils (Automotive Grade) : Series DUST, Series MC)
・When using our products, no matter what sort of equipment they might be used for, be sure to make a written
agreement on the specifications with us in advance. The design and specifications in this catalog are subject to
change without prior notice.
・Do not use the products beyond the specifications described in this catalog.
・This catalog explains the quality and performance of the products as individual components. Before use, check
and evaluate their operations when installed in your products.
・Install the following systems for a failsafe design to ensure safety if these products are to be used in equipment
where a defect in these products may cause the loss of human life or other significant damage, such as damage
to vehicles (automobile, train, vessel), traffic lights, medical equipment, aerospace equipment, electric heating
appliances, combustion/gas equipment, rotating equipment, and disaster/crime prevention equipment.
✽ Systems equipped with a protection circuit and a protection device.
✽ Systems equipped with a redundant circuit or other system to prevent an unsafe status in the event of a single fault.
1. Provision to abnormal condition
This power choke coil itself does not have any protective function in abnormal condition such as overload,
short-circuit and open-circuit conditions, etc.
Therefore, it shall be confirmed as the end product that there is no risk of smoking, fire, dielectric withstand
voltage, insulation resistance, etc. in abnormal conditions to provide protective devices and/or protection circuit
in the end product.
Temperature rise of power choke coil depends on the installation condition in end products. It shall be confirmed
in the actual end product that temperature rise of power choke coil is in the limit of specified temperature class.
Dielectric withstanding test with higher voltage than specific value will damage Insulating material and shorten
its life.
This Power choke coil must not be used in wet condition by water, coffee or any liquid because insulation
If this power choke coil is potted in some compound, coating material of magnet wire might be occasionally
damaged. Please ask us if you intend to pot this power choke coil.
When this power choke coil is used in a similar or new product to the original one, it might be unable to satisfy
he specifications due to difference of condition of usage.
Please ask us if you use this power choke coil in the manner such as above.
If the power choke coil receives mechanical stress such as drop, characteristics may become poor (due to
damage on coil bobbin, etc.). Never use such stressed power choke coil.
When this coil is used in the frequency band of the audible range (≒ 20 Hz to 20 kHz), or, when using in
burst mode, depending on the operating conditions (conditions of the energized waveform) sounds (buzz noise)
may occur. Depending on the circuit / board installation environment it may be heard as abnormal sounds,
so please check in advance.
If this power choke coil is dipped in the cleaning agent, and the coating agent of the toluene and the xylene
system, there is a possibility that the performance decreases greatly. Please ask us if you intend to pot this power
choke coil.
10. Static electricity measures (Series MC)
①Circuit design
Please set up the ESD measures parts such as capacitors in the former steps of this power choke coil for static
electricity when there is a possibility that static electricity is impressed to the choke coil on the circuit.
Moreover, please consult our company about such a case once.
strength becomes very low in such condition.