CM9900-106

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Common Mode Chokes (CMC) are devices that help prevent interference from entering a system from an outside source. They are used in applications that require high signal-to-noise ratios and sensitive analog circuits. At their most basic, CMCs employ a magnetic core, with either multiple windings or one winding in a symmetric loop, to filter and shield against outside interference.

The CM9900-106 is a high-performance CMC produced by Coilcraft. It offers a wide range of applications and working principles. This CMC is a two-pair, two-through-hole, ferrite core CMC that is designed to provide both common and differential mode filtering in the 100KHz to 10MHz frequency range. It is typically used in RF and EMI noise suppression applications in switching power supplies, data communications, consumer electronic devices, and audio equipment. Additionally, it can be used both to limit the transmission of energy from one device to another or to suppress common mode noise.

The CM9900-106 is a low-resistance CMC that is characterized by its low core loss and high current rating. It is able to maintain its high impedance ability even at high frequencies. Therefore, it can provide broad noise suppression in both common and differential-mode applications. Its current rating is rated up to 7A, and it has a wide range of inductances including 3.3uH, 8.2uH, 225uH, 330uH, 450uH, 680uH, and 1050uH.

The working principle of the CMC involves the utilization of the magnetic field generated in the core to reduce the noise. This is done by creating an inductance that blocks the current flowing in one direction. This inductance allows current to pass when the magnetic field is lower than the current being blocked. In the case of the CM9900-106, the core material is a ferrite which is able to generate a much higher inductance than the other cores like air, iron, etc. Therefore, it enables the device to provide a much wider range of noise suppression.

The windings of a CMC are crucial for its performance. The windings are responsible for transforming the magnetic flux into electrical inductance, which is essential for the noise suppression process. The CM9900-106 utilizes high-temperature rated wires, which are twisted together to increase the effective inductance. Additionally, this device is designed with symmetrical windings of different turns to create two identical signals that cancel each other out to provide differential-mode filtering.

The CM9900-106 is a two-hole CMC, which means it can be soldered directly to a board for EMI suppression. It comes with mounting screws and can be mounted in a variety of ways including vertical, horizontal, or offset position. Its size is 13.5mm x 13.5mm x 19.3mm, and it has a maximum operating temperature of 155°C.

Overall, the CM9900-106 is a high-performance, high-frequency input CMC with a wide range of inductances for a variety of applications. It is able to provide both common and differential-mode filtering and has a current rating up to 7A. It uses ferrite as its core material, which provides much higher inductance, enabling a broader noise suppression range. Furthermore, its windings are designed for a more efficient current transformation with high-temperature-rated wires. The CM9900-106 is capable of providing a solution for noise suppression in today’s compact, electronic applications.

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