What do numbers on inductor mean?

A three-digit code is often used to mark small inductors. The first two digits correspond to the first two digits of the value whilst the third digit is a multiplier which gives the number of zeros to be added to give the value in μH.

What is inductor used for?

Inductors are typically used as energy storage devices in switched-mode power devices to produce DC current. The inductor, which stores energy, supplies energy to the circuit to maintain current flow during “off” switching periods, thus enabling topographies where output voltage exceeds input voltage.

What is the largest inductor value?

Murata Manufacturing Co., Ltd. has recently developed a film-type high-frequency chip inductor（*1） that has the world’s largest inductance value（*2） of 39 nH.

How do you read an inductor?

Surface mount inductors or chip inductors use color dots instead of color bands. There are generally three dots that are read clockwise from the top. The first two dots indicate the significant digits of the inductance value, and the third dot indicates the multiplier. The value of inductance is obtained in Nano Henry.

Why do inductors overheat?

5% of inductors overheat and the insulation burns off simply because you are varying the magnetic field too much and not heat sinking the coil–as in a switching regulator.

What causes an inductor to fail?

Inductor Failures Inductors often fail open due to corrosion or bad internal solder joints or the inductors fail shorted due to electrical overstress, bad magnet wire insulation, or potting issues.

What is an inductor?

An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.

What is the normal inductance of an inductor?

Inductors have values that typically range from 1 µH (10 −6 H) to 20 H. Many inductors have a magnetic core made of iron or ferrite inside the coil, which serves to increase the magnetic field and thus the inductance.

What are low frequency inductors made of?

Low-frequency inductors are often made with laminated cores to prevent eddy currents, using construction similar to transformers. The core is made of stacks of thin steel sheets or laminations oriented parallel to the field, with an insulating coating on the surface.

Who coined the term inductance?

The term inductance was coined by Oliver Heaviside in 1886. It is customary to use the symbol for inductance, in honour of the physicist Heinrich Lenz. In the SI system, the unit of inductance is the henry (H), which is the amount of inductance that causes a voltage of one volt, when the current is changing at a rate of one ampere per second.