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Introduction to EMI/RFI Filters

EMI/RFI Filters are electronic components that are typically used to reduce the electromagnetic interference and radio frequency interference (EMI/RFI) in an electronic system. They are usually composed of multiple components such as inductors, capacitors, resistors and diodes that are connected in a specific manner. In this regard, they are often referred to as LC, RC Networks.

The type of filter being discussed in this paper is the PEMI6QFN/HR,132. This filter is designed to meet the requirements for specific applications such as medical, industrial, automotive, or other commercial/consumer products that need to minimize EMI/RFI emissions. It is typically supplied in a QFN package, has a current rating of 6A, and a nominal impedance of 132Ω at a frequency of 250MHz.

Application Field

The most common application for PEMI6QFN/HR,132 is in automotive systems. It is used to reduce the noise generated from electrical components in a car, such as electric motors, alternators, and computers driving the vehicle’s electronics. It is also used in medical electronics for making sure the equipment operates at the best possible performance and reliability. Furthermore, it can be deployed in industrial machinery and consumer products.

Working Principle

The PEMI6QFN/HR,132 filter works on the principle of attenuation. To attenuate interference, the filter contains components that either dissipate or reflect the external EMI/RFI. This means that the filter has an electrical conductivity that can be adjusted to the frequency of the external interfering signals. This is typically achieved by combining resistive, inductive, and capacitive components. By doing this, it creates a low pass filter that blocks higher frequencies while allowing lower frequencies to pass through.

The PEMI6QFN/HR,132 filter is also designed with a series of capacitors connected in parallel. This way, the filter is able to provide balanced attenuation over a wider range of frequencies. The resistive and inductive components in the filter are also used to further reduce the interference from the external EMI/RFI sources.

In summary, EMI/RFI filters help reduce the amount of interference experienced by electronic devices, and the PEMI6QFN/HR,132 is an example of one such filter that is specifically designed for the automotive, medical, industrial, and consumer markets.

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