ELF-18D225

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Common mode chokes (CMCs) are used in a variety of applications to suppress common mode interference, such as in automotive applications, industrial applications, and communications system applications. Popular CMCs include the popular ELF-18D225.

The ELF-18D225 is a common mode ferrite core-based filter that offers high differential mode insertion loss and low common mode insertion loss. It is designed to be used in power lines, data lines, and control lines. Its extended operating temperature range, from -40°C to +105°C, makes it suitable for use in both harsh and benign environments, with a long operating life.

The working principle of the ELF-18D225 is based on the Faraday’s law of magnetic induction. According to the law, when a current is passed through a long-shaped conductor, a magnetic field is set up around it, which interacts with the conductors on either side of it. If the currents flowing in the two conductors are equal and opposite, the magnetic field causes the current to cancel each other out, thus suppressing the common mode interference.

The ELF-18D225 offers excellent common mode suppression, with an insertion loss of up to 1.5dB at 1GHz. The insertion loss is further reduced due to the high permeability of the ferrite core, which increases the energy stored in the magnetic field. The core is also surrounded by an external shield, which ensures that any remaining radiation is contained within the magnetic field and not propagated into the air.

The ELF-18D225 is ideal for use in a variety of applications, such as automotive power lines, communications equipment, and industrial equipment. It is suitable for use in both noisy and quiet environments, and can be used in applications ranging from switching power supplies and brushless DC motors to variable frequency drives. It is also widely used in motor control equipment, power management systems, and industrial automation systems.

The ELF-18D225 offers an impressive package in terms of performance and size. It is easy to install, offers a long service life, has an extended operating temperature range, and is even RoHS compliant. This makes it an ideal choice for a variety of applications, making it a popular choice for EMI suppression.

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