What This 16-Position Header Is For
The 0039288160: This is a Molex Mini-Fit Jr 5566 series header, 16 circuits in a dual-row layout on 4.20 mm pitch. The tin-plated square pins and UL94 V-0 nylon housing suit it for general-purpose industrial and telecom equipment where the board stays inside an enclosure.
The 4.20 mm pitch and 0.165" row spacing set the board footprint — each pin sits on a 4.20 mm grid, and the dual-row layout means the header occupies a 16.80 mm wide footprint (4 pins wide) on the board. The 0.504" (12.80 mm) insulation height gives clearance for the mating receptacle's shroud, and the 0.138" (3.50 mm) solder tail length is standard for a 1.6 mm thick PCB — the pins protrude enough for a reliable through-hole solder fillet without bottoming out against the board.
Locking Ramp and Mating Half
When the pair is pushed together, the ramp clicks into the housing window and holds the connection against cable strain and vibration — no secondary lock needed for most panel or cabinet wiring.