The ACT45B-510-2P-TL003 is a surface mount two line common mode choke manufactured by TDK with a rated inductance of 51 µH at 100 kHz and a rated impedance of 2.8 kOhms at 10 MHz. It has a current rating of 200mA DCR and a nominal resistance of 1Ohm. This choke is used to reduce or eliminate common-mode noise by blocking or isolating 50/60Hz power line-frequency currents or higher-order harmonics from cables, cables assemblies, and circuit boards.