39S402C

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Inductors play an important role in a variety of applications across virtually all disciplines of electronics, ranging from the simplest circuits to sophisticated systems and machinery. Fixed inductors, in particular, are the most basic type, and they generally get incorporated into AC-DC power, RF, and audio circuits. The 39S402C is a fixed radial inductor among the popular 39S series manufactured by KOA Speer, and offers some outstanding electrical and environmental characteristics.

The 39S402C has a nominal inductance of 4.7mH, which can reach up to 10mH of inductance. It also has a rated current of 1A and rated dissipation of 1.25W. The inductor is especially designed for high-seasoning applications in the automotive industry. It has a high Q factor of up to 270 and a high SRF of up to 1MHz. In terms of size dimensions, the 39S402C has a winding diameter of 5.2mm, a height of 2.7mm and a maximum defined underside package of 11.3mm. It is also notable that the component is fully RoHS compliant, enabling worry-free use in newer projects.

The working principle behind a fixed inductor is quite simple and can be effectively demonstrated using an excellent example known as Faraday\'s Law of Induction. It states that whenever the magnetic flux passing through any closed circuit gets changed, then a system produces an electromotive force, which is directly proportional to the rate of change of the magnetic flux. In a radial inductor like the 39S402C, the change in the magnetic flux is created by the alternating electric current passing through its winding. This alternating current creates an electromagnetic field, which interacts with the winding\'s magnetic core. The inductor\'s job is to resist changes in the current passing through it and to store its energy in the form of magnetic energy. This, in turn, creates the inductance, which is expressed in ohms.

Generally speaking, fixed inductors are usually categorised based on the construction of their coil as well as its end terminations. The 39S402C is an example of an axial flat-wrap inductor, where the coil is wound around a toroidal core in a flat manner. This particular type offers high precision and stability due to its tightly wound coil. Some of the application fields for the 39S402C include automotive, power supplies, power line filters, and RF and audio applications.

The 39S402C is a very reliable and robust fixed inductor. It offers great electrical properties with excellent environmental characteristics and is particularly ideal for applications in hostile environments. Thanks to its small size and high performance ratings, the 39S402C can easily be incorporated into a number of ways, including through-hole mounting, PCB mount, and surface mount. As such, it is a much sought-after component in many industrial applications across various fields.

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