3090-122J

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Fixed Inductors

Inductors are passive electrical components which store energy in a magnetic field when current flows through them. Fixed inductors are components with a fixed inductance rather than adjustable inductance, which are mostly used in filtering, timing, tuning or pulse transform applications. This article will discuss the application field and working principle of 3090-122J, one type of fixed inductors.

Application Field

The 3090-122J fixed inductor from Coilcraft is a high-performance, low-profile power inductor designed for efficient operation in PWM switch-mode power supplies. It features a large inductance range of 1.5 μH to 330 μH, enabling it to be used for power supplies across a broad range of applications. Its high current carrying capability of up to 6.6 Amps makes it suitable for many industrial and automotive electronics.

The 3090-122J inductor can also be used for a variety of other applications besides power supplies. Its low DC resistance and high Q value make it an ideal choice for radio frequency (RF) and power line filters, RF chokes, switching supplies, and other high-frequency circuits. Additionally, the device is rated for operation from -55 °C to +125°C, making it suitable for use in extreme temperatures applications.

Working Principle

The 3090-122J fixed inductor is based on the principle of electromagnetic induction. When a current passes through the wire inducing a magnetic field in the vicinity, the wire core acts as a conductor. This induces a magnetic field around the core which acts as a second conductor, generating an alternating current in the opposite direction of the original current. This affects the capacitance and inductance of the inductor, changing the parameters of the current.

The 3090-122J inductor uses two concentric windings to generate a higher inductance than a solenoid-wound core. The inner winding is self-shielding and the outer winding is black anodized to reduce eddy current losses. The device is designed with a high permeability ferrite core material for optimal performance, allowing for efficient power transfer even at very high frequencies.

Due to its low DC resistance, low EMI radiation, excellent thermal stability, and high Q factor, the 3090-122J fixed inductor has excellent reliability and a long operational life.

Conclusion

The 3090-122J fixed inductor is a high-performance component which is suitable for use in power supplies, RF chokes, power line filters, and other high-frequency circuits. It features a large inductance range, high current carrying capability, and excellent thermal stability. Additionally, it is rated for operation in extreme temperatures, making it an ideal choice for applications which require reliable operation in harsh environments.

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