The Amphenol FCI 86840-438HLF is a 38-position, dual-row male header from the BERGSTIK II series, on the standard 0.100 inch (2.54 mm) pitch. It's an unshrouded, right-angle through-hole header with tin-plated phosphor bronze contacts — square pins, push-pull mating, no latch. The 0.100-inch pitch and dual-row layout mean this lands on a standard perf-board or 0.100-inch pad grid, 19 positions per row, so the board footprint is a straightforward 2x19 via array.
The 0.100-inch pitch is the classic DIP/header grid — the footprint is a standard 2.54 mm via pattern, so board layout tools and perf-boards accept it without custom pad work. The right-angle mount means the header body sits flush to the board surface; the 0.190 inch (4.83 mm) insulation height gives clearance under the body for traces or a ground plane. The 0.230 inch (5.84 mm) post length suits standard 1.6 mm PCBs with through-hole soldering.
The tin-plated finish and standard pitch mean this is a workhorse BOM line, not a specialty part that goes scarce.