SFBMT5000681MX0

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Feed Through Capacitors are components that allow an electrical signal that passes through an enclosure wall, chassis, or similar obstacle to break through the device without any interruption. Well-designed feed through capacitors, such as the SFBMT5000681MX0, ensure a reliable electrical connection between the two points with minimal signal loss. Furthermore, these devices provide filtering and shielding from any outside signal interference.

Feed through capacitors such as the SFBMT5000681MX0 are generally used to join two signal lines in either a DC or an AC circuit. It is ideal for applications where a single-sided circuit board requires complex signal routing, and where a ground plane is not available, such as in medical device chassis designs. These devices are also optimal for applications with high-voltage AC power lines due to the low EMI impedance.

The SFBMT5000681MX0 is designed to support low-voltage AC or DC power-line applications up to 5VDC at 500mA. The device has an operating temperature range of -25ºC to +85ºC and a capacitance range of 0.010µF to 10µF. It features low dissipation factor, low-leakage current, and 45-dB minimum signal shielding performance for superior noise immunity.

The SFBMT5000681MX0 performs its function by using two capacitors connected in series to form a capacitor divider, allowing some voltage transfer across the capacitor. One capacitor connects the signal line to ground and the other connects the signal line to the wall, chassis, or other obstacle. This creates a path for the signal to cross through the obstacle while maintaining an adequate level of attenuation.

The SFBMT5000681MX0 is constructed with a Flexible Insulated Copper Shield (FICS) and a Flexible Conductive Shield (FCS) to provide EMI shielding from both sides of the device. The FICS provides a dielectric protection to the FCS and also serves to increase the device’s shielding performance by providing an interlinked shield structure. This eliminates the need for additional shielding components. The FCS also provides additional EMI shielding to surrounding wires and tracks.

The SFBMT5000681MX0 is a valuable tool in many different applications due to its combination of flexibility, low-noise emission, and reliable performance. Its superior shielding protection ensures the accuracy of signals passing through the device, while its low-leakage current helps it to maintain a low operational temperature. Applications include medical device chassis design, high-voltage AC power lines, and where single-sided boards require complex routing. This device provides engineers with an effective means of passing electrical signals with minimal attenuation, interference, and temperature rise.

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