ELF-21N030A

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Common Mode Chokes are an important component of electromagnetic interference (EMI) control technologies. They are used to minimize the common mode noise in high-speed digital and analog circuits. ELF-21N030A is a common mode choke developed by Ching-Tech, and it is widely used in many fields.

ELF-21N030A common mode choke is an operating frequency in the range of 0.1 MHz to 30 MHz with a rated current of 25 A and an inductance range of 30 < L < 400 nH. It is made of a ferrite material with excellent shielding performance and a narrow air gap that minimizes magnetic flux leakage. Its dynamic resistance is as low as 0.2Ω and the linear resistance is lower than 0.01Ω. Besides, it has excellent THB characteristics and high loop stability.

The operating principle of ELF-21N030A common mode choke can be explained by the knee-shaped B-H curve of the ferrite material. When a direct current flows through the device, the limiter action due to the air gap will increase the magnetic field strength and make the device reach its saturation point, and the current through the device will therefore be limited. While when an alternating current passes through, the magnetic field strength tends to follow the shape of the B-H curve and thus the impedance of the choke at the operating frequency will remain the same.

Due to its superior performance in controlling common mode noise, ELF-21N030A common mode choke is widely used in various fields such as automotive, industrial, consumer electronics, medical and military applications. In automotive industry, it is mainly used to reduce common mode noise in vehicle electronic control systems. In industrial application, common mode chokes are used to suppress high-frequency and low-frequency electromagnetic interference in system circuit. In consumer electronics, it is mainly used to reduce noise from digital products, such as mobile phone, tablet and notebook, etc. In medical application, it is used in MRI equipment and other medical systems to reduce interference. In military application, it is mainly used to reduce noise in signal links, such as communication system and navigation system, etc.

Therefore, ELF-21N030A common mode choke provided by Ching-Tech has become one of the most popular common mode choke devices in the market. Its excellent technical performance makes it especially suitable for high-speed digital and analog circuits, high-density PCB and high-bandwidth systems. In conclusion, ELF-21N030A common mode choke is an indispensable part in the fields of automotive, industrial, consumer electronics, medical and military.

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