The 0878325122 is a 4-position, 2-row SMT header from the Milli-Grid 87832 series. Tin on the solder tails keeps the board-side cost down without affecting the contact interface. Pick-and-place vacuum cap and tape-and-reel packaging mean this header feeds straight into an SMT line without hand-placement.
The 0.141" mating pin length engages the receptacle contact beam fully without bottoming out. Insulation height of 0.252" (6.40 mm) above the board leaves clearance for low-profile components under the header. The SMT solder joints take the mechanical load from the cable — the push-pull latch holds the pair mated, but the board pads need enough copper to handle the peel force from a stiff cable.