NDMB234100 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 across 1–400 MHz and -3.0 dB maximum at 400–500 MHz. It provides excellent signal integrity with return loss of -22 dB minimum at 1–100 MHz and crosstalk isolation of -28 dB minimum at 1–100 MHz, along with common mode rejection ratio of -30 dB minimum at 1–40 MHz. The transformer supports a current rating of 960 mA per differential pair and includes 1,500 VAC isolation (60 seconds), making it suitable for robust Ethernet connectivity in networking equipment, industrial controllers, and telecommunications infrastructure.