4203-000LF

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EMI/RFI Filters (LC, RC Networks) are essential components for ensuring that electronic circuits and devices function correctly. The 4203-000LF is a multi-pole filter designed for filtering out both electromagnetic interference (EMI) and radio frequency interference (RFI) signals. This article explains the application field and working principle of the 4203-000LF EMI/RFI filter.

The 4203-000LF filter is specifically designed for use in power supplies, communications equipment, medical devices and other electronic products. As an EMI/RFI filter, it helps to reduce unwanted noise that could otherwise interfere with sensitive signal processing. The device features an easy-to-mount surface-mount packaging, making it an ideal choice for space-constrained applications.

The 4203-000LF is a three-terminal, multi-pole filter, with a wide operating frequency range of 10kHz to 1GHz. Its high-pass section couples electromagnetic interference (EMI) signals, and its low-pass section filters out radio frequency interference (RFI) signals. The filter has a maximum insertion loss of 1.2dB and a DC resistance of 0.2 ohms. This ensures a minimal signal loss across the filter and helps ensure that sensitive analog signals are not affected.

The working principle of the 4203-000LF filter is based on inductance and capacitance. It uses a combination of inductor-capacitor (LC) and resistor-capacitor (RC) networks to suppress interference signals. Since the filter is a three-terminal device, it provides a high level of EMI/RFI protection, due to its ability to separate signals at different frequencies. The filter also features a ‘low source impedance’ which helps reduce cross-talk and ensures that any interference signals that do enter the filter are effectively filtered out.

The 4203-000LF also has the advantage of being highly immune to temperature variations, making it an ideal choice for use in industrial and automotive applications. It is also resistant to vibration, shock and humidity, making it suitable for a variety of applications. Additionally, the device passes the UL 94V-O Flammability rating, making it safe to use in situations where flammability is a concern.

In summary, the 4203-000LF is a multi-pole, three-terminal EMI/RFI filter designed to help protect sensitive electronic circuits from unwanted noise. It uses a combination of LC and RC networks to separate low-frequency EMI signals, and a combination of inductors and capacitors to filter out higher-frequency RFI signals. The filter has a low insertion loss, a high immunity to temperature variations, and is resistant to shock, vibration and humidity. As such, it is an ideal choice for use in power supplies, communications equipment, medical devices and other electronic products.

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