The NDMA252100 is an Ethernet transformer module designed to support 1, 2.5, 5, and 10 Gbit/s Ethernet applications. It features four differential pairs with a 1:1 turn ratio (±3% tolerance) and provides high-performance signal transmission with insertion loss of -2.0 dB maximum across 1–400 MHz and -3.0 dB maximum from 400–500 MHz. The module delivers return loss of -22 dB minimum at 1–100 MHz and maintains excellent crosstalk isolation of -28 dB minimum at 1–100 MHz, with common mode rejection ratio of -30 dB minimum at 1–40 MHz. Each of the four differential pairs supports a current rating of 960 mA, and the transformer provides 1,500 VAC isolation (60 seconds) for robust signal integrity. This transformer is ideal for high-speed Ethernet connectivity in networking equipment, data center infrastructure, and industrial communication systems requiring reliable signal coupling and isolation.