Through-hole breakaway header, 42 positions, 0.100" pitch
The 4-103777-0-21 is the 42-position member of TE's AMPMODU Mod II breakaway header line, dual-row, unshrouded, with push-pull fastening. Rated 3 A per contact with tin-lead mating and post plating, 100.0µin (2.54µm) thick, and housed in a UL94 V-0 thermoplastic insulator rated -65°C to 105°C.
Board fit and routing density
The 0.100" (2.54mm) pitch and 0.100" row spacing define the board footprint — the 42 positions occupy a 2.100" row length. The 0.230" (5.84mm) mating contact length and 0.090" (2.29mm) post length set the through-hole depth. Unshrouded design allows the header to be snapped to length for non-standard circuit counts; the breakaway construction separates at scored grooves between positions.