FAQ

1

Products

Q.
Is an explanation of the basics of an inductor (a coil) available?
Q.
Please explain how an inductor (a coil) functions.
Q.
Why is inductance specified by numbers such as 1, 1.5, 2.2, 3.3, etc.?
Q.
Would it be safe to use an inductor in which a current exceeding the rated current flows momentarily?
Q.
Would it be a problem to use inductors in parallel?
Q.
I would like to use high frequency inductors for impedance matching. Which products do you recommend?
Q.
I do not understand how the direction identification markings on the MLG/MHQ series inductors correspond to each other.
Q.
Which inductor is recommended for smoothing a power circuit?
Q.
Why are the characters such as "4R7" or "100" printed on some products?
Q.
What is the Q value of an inductor (a coil)?
Q.
What is SRF (self-resonant frequency)?
Q.
Please explain the types of TDK's inductors (coils) and their differences.
Q.
Please provide a basic explanation of the process for choosing an inductor.
Q.
There are direction identification markings on some products. What are those markings for?

Measurement

Q.
When I measured the inductance of another company's product that is supposed to have the same inductance, it showed a different value. Why is that?

Electrical Characteristics

Q.
Do multilayer inductors for high frequency circuits experience a decrease in inductance due to DC current (DC bias characteristics)?
Q.
Please explain the specifying conditions for the rated current of inductors for power circuits (Power Inductors).
Q.
In there aging?
Q.
How can I check the inductance value for the desired frequency?
Q.
Please explain the specifying condition for the inductance value of a multilayer inductor for high frequency circuits.
Q.
Please explain the specifying condition for the rated current of a multilayer inductor for high frequency circuits.
Q.
What is the DC bias characteristic of an inductor for power circuits?

Environmental Compatibility

Q.
Do TDK's inductors (coils) support lead-free soldering?

Product Quality and Service Life

Q.
What is the FIT (Failures in Time) of your inductors?

Structure, material

Q.
Since it seems that inductors for high frequency circuits uses dielectric ceramics as the their material, I am concerned about magnetic flux leaking out.
Q.
What is a "magnetic shield type" power inductor (inductor for power circuits)?
Q.
Does singing become an issue with inductors, as in the case of multilayer ceramic capacitors? If so, what countermeasures can be taken?
Q.
What are the coils for decoupling?
Q.
What is the Gigaspira structure of multilayer inductors? Please explain its features.
Q.
Please explain the types of core materials for inductors for power circuits (Power Inductors) and the characteristic differences among them.