The Molex 1731620338 is an 80-position Nano-Pitch I/O receptacle from the 173162 series. This is a high-density interconnect built for board-to-board or wire-to-board signal paths where real estate is tight — the nano-pitch class typically sits below 1.00 mm centreline, so the 80 contacts pack into a footprint that would hold maybe half that count in a standard pitch connector. The housing carries a Board Guide to align the mating half during blind assembly, and a Pick and Place Cap for vacuum-pick automated placement on the SMT line.
Mounting and Termination — Two Options on One Part
This receptacle supports both Surface Mount and Through Hole termination. That dual-listed mounting type is unusual for a single order code — it suggests the 1731620338 has solder tails that can be reflowed on the surface side or inserted through plated holes, depending on the board stack-up and assembly line. The termination method is Solder, so the joint is metallurgical either way. The Tape & Reel packaging confirms it is intended for high-volume pick-and-place; the Cut Tape option covers prototype or small-batch builds.