550 Ohm common-mode choke for DC power rails
The TDK ACM1513-551-2PL-TL is a 2-line common-mode filter from the ACM series, designed for DC power line filtering. Its headline impedance of 550 Ohms at 100 MHz targets conducted EMI suppression on the power input of DC-powered equipment — think switch-mode supply inputs, motor drive DC buses, or battery-powered system rails where common-mode noise couples into the supply cable. Rated for 10 A continuous current with a maximum DC resistance of 4 mOhm, the insertion loss from the filter's own copper is under 40 mW at full load — negligible for the power budget. The 50 V DC voltage rating covers standard 12 V, 24 V, and 48 V industrial rails with headroom.
Obsolete — sourcing through independent channels
TDK has marked the ACM1513-551-2PL-TL as Obsolete. The horizontal SMD package (15.00 mm x 13.00 mm, 6.00 mm seated height) with 4 PC pad layout is specific to this series. A board spin would be required to substitute a different common-mode choke package, so verifying the remaining stock position before the last lots disappear is the practical move.
Board-fit and temperature envelope
The surface-mount horizontal package reflows on a standard IR profile; the 4-pad footprint with the large body means the solder paste volume under the pads should be controlled to avoid tombstoning on the larger pad pair.