NDMA254100 is an Ethernet transformer module designed for high-speed data transmission in 1, 2.5, 5, and 10 Gbit/s Ethernet applications. The device features a 1:1 turn ratio (±3%) with four differential pairs (BI_DA, BI_DB, BI_DC, BI_DD) and achieves insertion loss of -2.0 dB maximum from 1–400 MHz and -3.0 dB maximum from 400–500 MHz. It provides return loss of -22 dB minimum from 1–100 MHz and maintains crosstalk isolation of -28 dB minimum from 1–100 MHz and -19 dB minimum from 100–500 MHz. The transformer supports a current rating of 960 mA for each of the four differential pairs and includes high isolation capability of 1,500 VAC minimum for 60 seconds. This module is ideal for network interface cards, switches, routers, and other high-speed Ethernet equipment requiring reliable signal coupling and impedance matching.