The Texas Instruments SN74126N is a bus driver — a quad bus-buffer gate with three-state outputs, designed to drive heavily loaded bus lines in 5 V TTL logic systems. Its primary job is to isolate or connect a data bus to a logic block under the control of an output-enable signal, which makes it a standard building block for memory-mapped I/O, shared data buses, and backplane interfaces.
The RoHS compliance status is listed as non-compliant, which means this variant contains lead (Pb) and is not suitable for assemblies that must meet RoHS exemption-free requirements.
This packaging is common for through-hole DIP devices and is compatible with hand-insertion or wave-solder assembly.