The TE Connectivity 2129261-1 is a 40-position plug from the CHAMP.024 series, using center strip contacts arranged in 2 rows. It is a shielded connector with an integral cap — the shield and cap are built into the shell, not added as separate pieces. The connector terminates via solder, and the mounting accommodates both surface-mount and through-hole pads, giving the board designer flexibility in assembly process.
Mating and termination — what to pair it with
This plug mates with a CHAMP.024 receptacle — the center strip contact interface is keyed by the shell geometry, so the plug and receptacle align before the contacts engage. Termination is solder; the dual SMT/through-hole footprint lets you reflow the surface-mount pads and hand-solder the through-hole anchors, or use a wave-solder process if the board design supports it.