3191106750 is a part number for a Surface Mount Magnetics device. It is designed to reduce EMI susceptibility and improve the characteristic impedance of a number of circuits. This device is available in various sizes and has various options, such as shielded sources, unshielded sources, 1:1, 2:1, and 3:1 transformer ratios. This device is ideally suited for high-speed applications such as broadband communications, wireless networks, and more.