KNH21C471DA3TS Filters

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EMI/RFI Filters (LC, RC Networks)

The KNH21C471DA3TS is a type of EMI/RFI filter from Murata Electronics North America. It is an equivalent alternative for IDT EMI/RFI filters. The KNH21C471DA3TS is specifically designed for common-mode noise suppression and EMI/RFI filtering in all types of portable and digital devices and systems.

The KNH21C471DA3TS consists of a dielectric material with a potential control circuit, and two inductors. This filter is very compact and allows for high-speed transmission over a wide range of frequencies. It also features low loss characteristics and high common-mode impedance. With its superior high-frequency attenuation, it is ideal for suppressing common-mode noise.

The KNH21C471DA3TS\'s common-mode attenuation works by providing a balanced impedance between two ports. When two related differential signals pass through the same filter path, each signal experiences the same amount of impedance, and so the signal balance is maintained. This results in a filtering effect that stops high frequency noise from entering the transmission line.

The LC (inductance/capacitance) networks in the KNH21C471DA3TS provide the filtering effect. They are a combination of two components, inductors and capacitors. When two adjacent segments of an LC network are connected, a resonance is formed. This resonance creates a frequency-dependent impedance which is then used to suppress noise in high frequency ranges. The lower frequency ranges are also filtered by a single component, either the capacitor or the inductor.

The KNH21C471DA3TS also features a potential control circuit that is used to reduce the effects of induced voltage transients. This is achieved by connecting two series inductors in parallel to a capacitor, with the outer circuit being an AC voltage source. This creates an RC (resistor/capacitor) network which provides damping and absorbs the energy of the transients.

The KNH21C471DA3TS is suitable for applications in many different device types and electronic systems, including LCD televisions, car audio systems, home applications, portable communications and medical devices. It is also used in power electronics, such as in power supplies, battery chargers, industrial automation systems, electric vehicles and AC/DC converters.

Overall, the KNH21C471DA3TS is an EMI/RFI filter of exceptional quality and performance. It offers reliable and robust protection against common-mode noise and EMI/RFI interference, ensuring excellent signal integrity and system performance. Its superior high-frequency attenuation makes it an ideal choice for many different applications.

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