Pin, Female, Box and Ejector Headers as One Interconnect System

Assign roles before part numbers

Chaos looks like this: debug pins, internal ribbons on open headers, and a box header on the next board — three pitches, three tools. Draw the interconnect block first: which mates are board-to-board, which are board-to-wire.

A clean split

• Pin + female: stacked or right-angle PCBs, modules, debug rows. Control insulator height and pin length.
• Box + IDC: internal looms with rare unmating.
• Ejector + IDC: locked, serviceable, vibrating board-to-wire.
• Avoid: Dupont jumpers as production harnesses, and IDC plugs on open pin strips.

Three factory rules

• Keep one or two pitches in a product, e.g. 2.00mm inside and 2.54mm on the service port.
• Keep plating consistent on each mating face; mixed gold/tin must be drawn.
• Reuse the same pin-1 and keying rule on every board and harness.

Junjia’s core families are pin headers, female headers, box headers and ejector headers. Send one interconnect diagram and we can align pin length, height, plating and keying before final assembly discovers a mismatch.