4305-009LF

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Feed Through Capacitors

Feed through capacitors, also known as DC blocking, feed thru, or RF feed thru capacitor, are useful for passing DC voltage and AC signal simultaneously on one line, while blocking the DC source of power. The 4305-009LF is a key example of a feed through capacitor, which has a range of application fields and a working principle that does exactly this.

Application Fields

The 4305-009LF is an AC line filter, and is primarily used in electronic equipment such as computers, gaming consoles, and television sets. It is used to help protect the equipment from electromagnetic interference (EMI) and conducts AC line frequency signals while isolating any DC excesses or shorts caused by the device. This type of capacitor is also ideal for “signal over DC” applications, such as a telephone system, where it is used to separate the powered circuitry from the signal line.

Working Principle

The working principle of a feed through capacitor is relatively simple. The capacitor acts as a high impedance for the DC voltage while allowing AC signals to pass through. It is essentially a passive filter, meaning it does not require any additional power source apart from the AC voltage it is connected to. The 4305-009LF feed through capacitor offers a combination of capacitance values calibrated to provide a high-level signal along with a low-level DC bias. This particular model is rated for a current up to 5 amps, and its inductance is also optimized for high frequency applications.

Feed through capacitors are popular because they offer a low-cost way to provide power to AC devices while also blocking any DC power surges. With the feed through capacitor attached, the device is less likely to suffer from EMI, thus providing enhanced protection. The 4305-009LF in particular is robust and reliable, making it an ideal choice for numerous applications.

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