ELF-18D650G

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Common mode chokes, also known as CM chokes, are devices that are designed to filter out the signals from a power source, eliminating interference that could otherwise affect the signal. The ELF-18D650G is one such choke that is widely used in the telecommunications industry. This article will explain the application field and working principle of this device.

The ELF-18D650G is a common mode choke specifically designed to filter out EMI~(ElectroMagnetic Interference) signals in the 5 to 18GHz range, making it especially suitable for applications involving higher frequency radio applications and optical systems. The choke is a four hole iron core type that combines two copper windings in series to form the complete device. The high frequency CM inductor has a differential inductance of 13nH, differential capacitance of 1.5pF, an impedance of 18 ohms, and a maximum differential current rating of 150mA. It is also able to handle a maximum operating temperature of 125°C.

To understand how the ELF-18D650G works, it is important to understand the basics of magnetic induction. As current passes through the first winding, a magnetic field is generated, creating a changing electric field in the second winding. This electric field induces a current flow in the second winding (common mode current). The choke is designed such that the output signal only passes through the second winding, while the signals generated by the EMI interfere with the output current, creating a low frequency difference in voltage in the first winding, without passing through the second winding. This prevents any interference from getting through the filter, effectively blocking the EMI signal.

The ELF-18D650G is used in a variety of applications and industries. In the telecommunications industry, for instance, it is used to protect sensitive circuitry from radio frequency interference. It is also commonly found in consumer electronics and computer systems, where it is used to protect sensitive components from electrical noise caused by power supplies and other equipment. In the automotive industry, it is used to prevent interference from automotive electronics, such as radio transmitters. In addition, the device is found in medical equipment, helping to filter out EMI that could otherwise disrupt the operation of the equipment.

In addition to its application fields, the ELF-18D650G has a range of important features that make it the ideal common mode choke for a variety of applications. The device offers an enhanced field impedance by 35% compared to other similar devices, providing improved effectiveness in noise cancellation. It also offers an increased differential capacitance of 40%, allowing for a better signal transfer, which is ideal for higher frequency applications. The choke also features a unique heat conduction path that helps to reduce core losses to a minimum, while still maintaining the highest level of protection from EMI.

In summary, the ELF-18D650G is a common mode choke specifically designed to filter out EMI in the 5 to 18GHz range. It is used in the telecommunications, consumer electronics, automotive, and medical industries to protect sensitive circuitry from radio frequency interference. The device features an enhanced field impedance by 35%, increased differential capacitance of 40%, and a unique heat conduction path to reduce core losses to a minimum. All of these features make the ELF-18D650G an ideal choice for filtering out EMI in a variety of applications.

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