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Fixed Inductors

Fixed inductors are electrical components that use a magnetic core to store energy in the form of an induced magnetic field. These components are used to control the current flow throughout a circuit, and are especially useful in applications such as radio receivers, power supplies, and motor drivers. Fixed inductors are typically made of copper coils, ferrite cores or air-core inductors. This article will focus on the application field and working principle of SDR0403-300JL, a fixed inductor manufactured by Doncey Electronics.

SDR0403-300JL Application Field

With its high current capacity and low DCR resistance, the SDR0403-300JL is suitable for applications such as DC-DC converters, switch mode power supplies (SMPS) and electronic ballasts. The inductor’s operating temperature range is between -40 to +125 degrees Celsius, making it well suited for use in automotive applications. It is also RoHS compliant and UL 94V-0 certified for safety.

The SDR0403-300JL is a 13.2mm x 7.33mm axial leaded inductor, with a choice of lead free silver or tin-silver terminations, and solderable PC tail. The device contains a 53mH inductance at 100kHz and 10V; and has a rated DC current of 3.120a. It also has a maximum rated DC current of 6.450A.

SDR0403-300JL Working Principle

The SDR0403-300JL fixed inductor is based on the principles of electromagnetic induction. It operates by building up a magnetic field around a coil when a current flows through it. This field then induces a voltage within the coil in a process known as self-inductance. This induced voltage opposes the rise in current, which in turn causes the current flow to decrease.

The strength of the magnetic field created is determined by the inductance of the coil. The SDR0403-300JL has a 53mH inductance at 100kHz and 10V, which provides an effective resistance to any change in the current flowing through it. This can be used to stabilise the current, and prevent any sudden increases or decreases in current as the device works.

In summary, the SDR0403-300JL is a fixed inductor from Doncey Electronics used in applications such as DC-DC converters, switch mode power supplies and electronic ballasts. It has a 53mH inductance at 100kHz and 10V, and is based on the principle of electromagnetic induction. With its low DCR resistance, high current capacity, and RoHS compliance, the device is suitable for a wide range of applications.

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