WHSG48001G Gigabit LAN Transformer

Land pattern, the net names of all 48 pins and every electrical rating match; the only difference is which side carries the common-mode choke — on the WHSG48001G it sits on the cable side at pins 25–48 (CMT/TX), on the WHSG48002G on the chip side at pins 1–24 (TCT/TD).

Package and pinout being identical, changing between them needs no PCB work; decide from what the PHY reference design specifies for choke position, and re-run EMC on the finished unit after a change.

Pins 1–24 are the chip side, named TD1± through TD8± with centre taps TCT1 through TCT8; pins 25–48 are the cable side, named TX1± through TX8± with centre taps CMT1 through CMT8.

Orient the WHSG48001G with pins 1–24 toward the PHY and pins 25–48 toward the RJ45 and both ports' pairs run straight through. Centre-tap net naming follows several different conventions across the 100/1000 BASE-T range, so check it against this part's own drawing rather than carrying it over from another.

No. The WHSG48001G datasheet carries no PoE current item, so both ports are powered locally on the board.

The centre taps serve as AC termination and common-mode reference only, with no DC current rating, and cannot be reworked into a supply path. A port that has to deliver power over the cable needs a part rated for per-channel DC current, chosen at selection time from the 100/1000 BASE-T range.