The TE Connectivity AMP-Latch 1658621-3 is a 16-position IDC receptacle built for mass-terminating 26-28 AWG ribbon cable. It sits in the AMP-Latch series, the workhorse for parallel data and control interconnects inside enclosures where a reliable, solderless cable-to-board connection is needed. The 0.100" (2.54mm) pitch matches the standard.025" square header footprint, so the board-side mating half is the common AMP-Latch male pin header.
The 16 positions match a 16-conductor ribbon cable one-to-one — no unused pins, no splitting. The free-hanging (in-line) mount makes it a cable-end connector, not a board-mounted one. The polarizing key and feed-through feature let you daisy-chain multiple receptacles on the same cable run without mis-mating. Colour is black, which is the standard for this series — no colour-coding variant to track.
The closest same-series peer is the 1-226733-4 (17 positions), also a free-hanging AMP-Latch receptacle with IDC termination and a detent lock. The one-position difference is the deciding factor: if your cable has 16 conductors, the 1658621-3 is the exact BOM match. The 17-position variant adds a spare line, but for a standard 16-wire ribbon, you'd waste a position.