Footprint and board layout fit
The 77311-122-04LF: Overall contact length is 0.525" (13.34mm): the mating pin extends 0.305" (7.75mm) above the insulator, and the solder tail is 0.120" (3.05mm) long. This tail length works for standard 1.6mm thick PCBs with through-hole plating. No shrouding means the header sits flush to the board edge without extra clearance.
