What This A3 Receptacle Housing Does
The Hirose A3B-12D-2C is a 12-position, dual-row receptacle housing from the A3 series, designed for free-hanging inline wire-to-board or wire-to-wire connections.
Pitch, Positions, and the Housing-Only Reality
At 0.079" (2.00 mm) pitch, this housing mates with standard A3 series pin headers. The dual-row layout gives you 12 circuits in a narrower body than a single-row 12-position — useful when routing a harness through a tight cable gland or conduit. The black PBT insulation material handles -55°C to 85°C, which covers most control cabinet and light industrial environments without issue. The 'Contacts Not Included' note is not a footnote — it is the main procurement detail. You need the separate A3 series female crimp socket terminals (sold per reel or strip) to populate this housing.
The difference is 12 positions versus 8 — four more circuits in the same body width. For a 12-circuit control interface, this is the direct fit.