The B3B-XH-AM is a JST XH series board-to-cable/wire header with 3 positions on a 2.50mm pitch, through-hole mounting, and a shrouded-4-wall design that protects the male pins and guides the mating receptacle.
At 2.50mm pitch and 3 positions, this header occupies a compact board footprint. The contact length after the post is 0.134" (3.40mm), which sets the solder tail length for through-hole assembly. The insulation height of 0.276" (7.00mm) and mated stacking height of 9.8mm define the z-space budget when mated with the receptacle.