What the 5.8 kOhm impedance means for your signal line
The ACT45C-101-2P-TL000 is a two-line common mode choke from TDK's ACT45C series, designed to suppress conducted EMI on signal pairs. Its 5.8 kOhm impedance at 10 MHz targets the common-mode noise that couples into automotive CAN, LIN, or sensor lines — the high impedance at that frequency shunts the noise away from the receiver without loading the differential signal.
The 100 µH inductance at 100 kHz provides the low-frequency common-mode attenuation needed alongside the high-frequency impedance peak — useful for filtering switching noise from DC-DC converters on the same board.
The two winding pads are on opposite sides of the body — the layout should keep the differential pair traces symmetrical to avoid converting common-mode to differential noise.