Comparing the 280381-1 to a Peer Alternative
The 280381-1 offers 10 positions at 0.100" pitch with a 3-wall shroud; the 1394090-1 provides 6 positions at 0.112" pitch with a 4-wall shroud and a latch holder. The 280381-1's higher pin count and standard 2.54mm pitch suit denser board layouts, while the 1394090-1's 4-wall shroud and latch holder offer more robust cable retention for lower-count harnesses.
The header terminates via solder to the PCB through the 0.138" (3.50mm) post length, and the contact length for mating is 0.260" (6.60mm).