Board-layout fit and signal duty
The 280378-2: The single-row, 4-position arrangement keeps the board footprint narrow — useful for edge connectors where trace fan-out is tight. The 0.138" (3.50 mm) post length suits standard 1.6 mm boards; the solder tails sit flush after wave soldering.
The 3-wall shroud guides the receptacle during blind mating and protects the pins from bending. Operating temperature is -40°C to 80°C, so this header is suited for indoor industrial cabinets, test equipment, and consumer electronics — not for engine compartments or high-heat enclosures.
Cross-shop comparison: 1-1871673-2
It carries tin-plated mating contacts rated for general-purpose and industrial use, with voltage up to 250 VAC/DC. The 280378-2 uses a single row, gold mating finish, and a lower voltage ceiling — choose the 280378-2 when the application requires gold-on-gold contact reliability and a single-row footprint.