The RRT75474‑DNT is a low‑power, high‑performance, 128Gbaud quad‑channel linear driver IC. It is designed for 800Gbps and beyond optical integrated transmitter small‑form‑factor (SFF) modules used in metro and long‑haul applications. The device integrates analog control circuitry and digital control via an serial peripheral interface (SPI), enabling precise, independent drive‑level control, and monitoring. Each driver channel features a 100 Ω differential AC‑coupled input and a 60 Ω differential interface with an open‑collector output stage. The device is suitable for InP based, thin‑film lithium niobate, and silicon photonics Mach–Zehnder modulators.