Identifying the Right Terminal Block Plug
The Molex 39980-0312 is a NEO 508MM TB PLUG S98 STY09 CKT, a terminal block plug from the Header Plugs & Sockets category. It's the part you reach for when you need a 5.08 mm pitch plug for a terminal block application — the 508 in the description confirms the pitch, so you know the board footprint matches the mating header. The S98 STY09 likely indicates a specific style or keying variant, meaning it mates only with its intended receptacle, which prevents mis-wiring on the line.