The SRF2012A-900YA 2 Line Common Mode Choke Surface Mount manufactured by Bourns is an electrical device designed to reduce noise in communications and other electronic installations. This part is 90 Ohms @ 100 MHz with a 400mA DCR (direct current resistance) of 300mOhm. It is built to offer high signal isolation and provide good rejection of high frequency common mode noise. This is usually used in applications such as power line and data line adaptive electronic systems, automotive infotainment systems, LCD display systems, and other telecommunications systems.