WHD16503G 10/100BASE-TX LAN Transformer

The channel structure is identical; what differs is the packaging system. The WHD16503G also holds two 1CT:1CT units, forming the two channels — one pairset — of a single 100M port.

It sits on a 2.54 mm pitch with 7.62 mm row spacing, the 0.1-inch grid, on a 20.30 × 9.80 mm body, where the 12-pin parts in the 10/100 BASE-T range use 2.00 mm pitch on a body only 13–14 mm long. A 16-pin part is usually chosen because the equipment carries over an existing 0.1-inch-grid board, or because the layout wants wider pin separation.

No. Body size, height, pitch, row spacing and hole diameter are all identical; only the lead span differs — 17.78 mm on the WHD16503G against 15.24 mm on the WHD16506G, exactly one 2.54 mm grid step apart.

The WHD16503G uses one more grid position per row, so the outermost holes do not line up. The footprint library needs separate entries; an identical body is not grounds for reusing the same land pattern.

Through-hole equipment laid out on the 0.1-inch grid that needs one 100M port, with the component temperature between 0 °C and +70 °C.

The WHD16503G is a through-hole part assembled by wave soldering, on a 20.30 × 9.80 mm body, 6.80 mm high, with 3.00 mm leads. It carries no PoE, so the port is powered locally. Where board area is tight the shorter 12-pin parts in the 10/100 BASE-T range are an option, but they belong to a different pitch system and the holes do not carry over.