The SOIC package is neat. The ethernet transceiver has 14 terminations with different functions. There is a voltage requirement of 12V. The pin count is 14. A buffer such as this has a maximum ambient temperature of 70°C. It can be classified as an interface IC for the LINE DRIVER interface.
SN75C188NS Features
SN75C188NS Applications
There are a lot of Texas Instruments SN75C188NS Buffers & Transceivers applications.