1.25 mm pitch SMT header for wire-to-board signal duty
The 1-1734260-5 is a 15-position, single-row, surface-mount header from TE's High Performance Interconnect (HPI) series. It mates with the matching HPI crimp receptacle to form a board-to-cable/wire connection at a 1.25 mm pitch — tight enough to save board real estate but still hand-solderable in rework.
The closest functional alternative in the evidence is the 1-292164-1, a through-hole right-angle header from the CT series. The 1-1734260-5 is SMT, tighter pitch, and has solder retention — a different assembly process and footprint.