What 550 Ω at 100 MHz means on a 10 A rail
The ACM1513-551-2PL-TLHF is a TDK ACM-series common-mode choke rated at 550 Ω impedance at 100 MHz, but the number that matters for a power rail is the 10 A continuous current rating with only 4 mΩ DC resistance. At 10 A the I²R loss is just 0.4 W — the choke stays cool enough that the 85 °C operating ceiling is not the limiting factor; the solder joint temperature at the 0.236" seated height is.
Board-fit and footprint
Horizontal package with four pads, 0.591" x 0.512" footprint — the body sits low enough that the 6.00 mm height clears most enclosures, but the 15 x 13 mm pad area means the choke blocks the inner layers under it. Route the differential pair around the keep-out zone, not through it.