4251-004LF

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EMI/RFI Filters (LC, RC Networks) can be divided into two categories—Inductive and Capacitive Filters. Inductive filters typically contain an inductor, resistor, and capacitor, while capacitive filters use a capacitor and a resistor. The 4251-004LF application field and working principle falls under the second type, capacitive filter.

The 4251-004LF capacitive filter is used for interference attenuation from 1 MHz – 200 MHz. This specific filter features an attenuation of up to 80dB, with ideal for use in EMI/RFI applications. This filter can operate in a wide range of temperature environments, from -55 to +125°C, making it well-suited for industrial applications.

The working principle of this filter involves the use of a capacitor in conjunction with a resistor. The capacitor acts as a low-pass filter, allowing frequencies below its cut-off frequency to pass through. In addition, the resistor can be adjusted to change the cut-off frequency of the capacitor, allowing frequencies above the cut-off frequency to be filtered out. In the case of the 4251-004LF filter, the cut-off frequency can be adjusted by changing the value of the resistor.

This filter is ideal for EMI/RFI applications due to its high attenuation power and wide temperature range. In addition, since it only requires two components—a capacitor and a resistor—it is a relatively simple design, making it easy to manufacture and install.

In conclusion, the 4251-004LF capacitive filter is a great solution for EMI/RFI applications. Its high attenuation power, wide temperature range, and two-component design make it an ideal choice for a wide range of applications.

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