The 5102154-5 is a 24-position, 0.100" (2.54mm) pitch, shrouded header from TE's AMP-Latch series. It mates with AMP-Latch receptacles for board-to-cable/wire connections. A keying slot and mounting flange are built in. The keying slot prevents inserting the wrong receptacle; the flange gives a positive mount to a panel or bracket, taking strain off the solder tails.
The 1379030-3 is a 12-position, right-angle version with tin mating finish and a friction lock. The 5102154-5 doubles the circuit count to 24, uses a vertical orientation, and upgrades the mating finish to gold or gold-palladium — a meaningful difference for applications needing more I/O and higher mating-cycle life.
This header mates with AMP-Latch receptacles (e.g., 746285 series) that accept 20-26 AWG ribbon cable or discrete wires with the matching crimp terminals.