ELF-21V012A

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Common Mode Chokes are essential components in the world of electronic engineering, providing differential and common mode filtering, as well as noise filtering and control. In particular, the ELF-21V012A is a common mode choke specifically designed for high frequency applications requiring high attenuation. Primarily, the ELF-21V012A enables effective filtering between DC to 200MHz, in addition to providing both common and differential mode noise attenuation.

In terms of applications, the ELF-21V012A primarily finds its usage amongst Ethernet, USB, DVI, HDMI, monitor, HDTV, digital camera, and audiovisual equipment. Such equipment often employ high frequency transmission and is susceptible to electromagnetic interference, so the ELF-21V012A provides just theright amount of filtering needed. Moreover, the ELF-21V012A is also commonly used in power supplies and communication systems, providing both effective common mode and differential mode filtering thereby preventing ground potential differences.

In terms of working principle, the ELF-21V012A consists of two windings wound on a ferrite bead core, providing two conductors for testing and measurement. It is these two windings that provide the filtering, with one winding for common mode rejection, the other for differential mode rejection. The impedance of the ELF-21V012A varies with frequency, providing a broad frequency range with high attenuation.

When the current flows into the winding, the magnetic field generated encircles both the winding and the center of the core. Since the two conductors are wound in opposite directions, the magnetic field acts in same direction on one winding, while on the opposite winding it acts in the opposite direction. This results in the two windings interfering with each other, and as higher frequency signals tend to deflect more from the magnet field, a high frequency current can easily be attenuated by the ELF-21V012A. In addition, the ferrite bead also increases the dynamic range of the ELF-21V012A, providing larger current ranges at higher frequencies.

The ELF-21V012A is also an excellent product when it comes to suppression of common mode and transverse mode noises generated by current discontinuities due to transients, surges and switching applications. With its ferrite core, the ELF-21V012A can also be used for higher current applications. This versatile component also provides additional benefits, such as low insertion loss, universal footprint, and wire-wound construction that makes it suitable for a variety of applications.

In summary, the ELF-21V012A is a very useful common mode choke, providing excellent differential and common mode filtering over a broad frequency range from DC to 200MHz. It is used in a variety of applications, such as Ethernet, USB, DVI, HDMI, monitor, HDTV, digital camera, and audiovisual equipment; as well as power supplies and communication systems. The ELF-21V012A provides effective suppression of common mode and transverse mode noises, and also offers low insertion loss, universal footprint, and wire-wound construction, making it suitable for a variety of applications.

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