SPD73R-393M

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Fixed inductors are a type of inductor which are designed to maintain a specific value of inductance in an electrical circuit. These inductors are primarily used in filters, resonators, impedance matching, and battery charging circuits. The fixed inductor can also be used as an RF matching device, providing a fixed impedance to match the desired frequency of the circuit. The SPD73R-393M is a type of surface-mounted fixed inductor made by Murata Manufacturing Company. It has a power rating of 4A and an inductance range of 4.3mH to 14.2mH.

The SPD73R-393M has a wide range of uses. Its high current rating, small size, and low profile make it ideal for power supply filter and power line filter applications where space is limited. It is also suitable for applications such as DC-DC converters, buck converters, solar inverter, LED drivers, phone charging applications, motor control applications, and LCD TV systems. In addition, the SPD73R-393M can be used for EMI choke and EMC suppression in various applications.

The working principle of the SPD73R-393M is based on Farady\'s Law of Electromagnetic Induction. This law states that when a conductor moves through a magnetic field, a current is induced in the conductor due to the changing magnetic flux linking between the conductor and the magnetic field. The SPD73R-393M uses this principle to produce an applied magnetic field in response to current passing through the inductor windings. This results in an induced current in the opposing direction, with the opposing current cancelling out the current passing through the windings, thus reducing the overall current.

The SPD73R-393M is constructed with four windings of polyetherimide or polyphenylene sulfide-encapsulated enameled copper wire. The windings are contained in a small ferrite core, which helps to reduce the size of the device while maintaining its efficiency. The windings are connected in series with a calculated number of turns to achieve the desired inductance. The wires are soldered onto copper posts at each end, and the unit is then potted with epoxy resin, providing additional protection from environmental damage and vibration.

Overall, the SPD73R-393M is a reliable, efficient, and cost-effective fixed inductor for a variety of applications. It is capable of providing up to 4A of current, and its small size and low profile enable the device to be used in tight spaces. The working principle of the SPD73R-393M is based on Farady\'s Law, and it utilizes a ferrite core and four windings of enameled copper wire in order to produce the desired induction. The device is also potted with epoxy resin for additional protection against environmental damage.

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