WHDG72K01TG Gigabit LAN Transformer

Where the transformer's own location powers up below 0 °C, or runs above +70 °C for long stretches.

Outdoor cabinets and unconditioned industrial floors are the first case; a quad-port part carries a lot of channels and often sits near the power supply, so the second case turns up inside chassis as well. The WHDG72K01TG is rated -40 °C to +85 °C, leaving headroom at both ends against the standard grade, and other wide-temperature parts sit in the 100/1000 BASE-T range.

Yes, and it is a complete drop-in: body, the definition of all 72 pins, hole size, internal element order and every electrical rating match, with only the temperature grade different.

Neither the PCB nor the termination network changes; the swap only calls for the cold start-up verification to be repeated at the wider grade. The reverse is not symmetric — going back from the WHDG72K01TG to the standard grade raises the cold limit to 0 °C.

A recommended ø0.70 mm hole, smaller than the bar-shaped 72-pin parts use.

The two 72-pin quad families do not share hole sizes, and reusing the ø0.90 mm figure leaves the WHDG72K01TG leads loose in the hole, which shows up after wave soldering as voids or insufficient fill. Leads on the WHDG72K01TG are 0.40 mm wide and 3.00 mm long, laid out to the 34.50 × 19.00 mm block outline.