PMR205AC6470M047R30

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What is EMI/RFI Filters (LC, RC Networks/PMR205AC6470M047R30Application Field and Working Principle

EMI/RFI filters (electromagnetic interference/radio frequency interference) are basically electronic filters that are used to isolate or divert the flow of electric current. They are designed to provide protection from interference that could cause disruption to an electronic system, as well as to provide better control of emissions. This type of filter generally consists of an inductor and capacitor, referred to as LC filters and a resistor and capacitor, referred to as RC filters.

PMR205AC6470M047R30 Application Field and Working Principle

The PMR205AC6470M047R30 filter is a small, low profile, single-stage, EMI attenuation filter used in Ethernet applications. It consists of two separate filters: an LC filter and an RC filter. The LC filter consists of an inductor and capacitor; the RC filter consists of a resistor and a capacitor.

The PMR205AC6470M047R30 filter provides a high level of EMI suppression and noise attenuation, reducing the amount of interference in the Ethernet signal. The filter is designed to suppress emissions in accordance with EMC EN 55032 2009 Class B requirements, which states that for an undesired emission at 100KHz, the signal must be attenuated by 40dB. The filter also complies with UL 60601-1 and CES-1 standards.

The working principle of the PMR205AC6470M047R30 filter is based on the fact that the frequency of incoming signals is determined by the size of the capacitor, and the inductance of the inductor determines the amount of attenuation. The capacitor allows a current to flow when a voltage is applied. When the voltage is removed, the current stops. This is called capacitive reactance. The inductor provides a resistance that limits the current when a voltage is applied. When the voltage is removed, the resistance dissipates. This is called inductive reactance.

When the incoming signal has a frequency that is higher than the capacitor\'s cutoff frequency (or the inductor\'s cut-off frequency for higher frequencies), it creates a waveform that is distorted. The capacitor and inductor then act as noise and interference filters that reduce the level of noise and interference in the signal. The attenuation of interference and noise is accomplished by the RC network, the LC filter, or a combination of both.

The combination of the capacitor and inductor represents what is known as a self-resonant frequency in a tuned circuit. The RC filter is used for filters with relatively high frequencies. The RC filter is used to block signals with frequencies higher than the cutoff frequency. The LC filter is used for filters with relatively lower frequencies. The LC filter can be used to reject noise that is outside of the required frequency range.

EMI/RFI filters provide an effective and reliable way to reduce EMI. The PMR205AC6470M047R30 filter provides industry leading performance with a compact design, making it suitable for a range of Ethernet applications. The filter is easy to install and can be used in a variety of scenarios to improve the reliability and performance of Ethernet networks.

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