NDMB232100 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 with ±3% tolerance and supports four differential pairs (BI_DA, BI_DB, BI_DC, BI_DD) with a current rating of 960 mA per pair. Key electrical characteristics include insertion loss of -2.0 dB maximum from 1–400 MHz and -3.0 dB maximum from 400–500 MHz, return loss of -22 dB minimum from 1–100 MHz, and common mode rejection ratio of -30 dB minimum from 1–40 MHz. The transformer provides 1,500 VAC isolation (60 seconds at 1 mA) and crosstalk isolation of -28 dB minimum from 1–100 MHz, ensuring reliable signal integrity in demanding networking environments. This module is ideal for Ethernet interface applications requiring robust isolation and low-loss signal transmission.