The 0.100" (2.54mm) pitch is the standard MTA-100 grid, matching the full ecosystem of MTA-100 headers and transition connectors. This is the closed-end variant (no daisy-chain pass-through), so the 12 circuits terminate at this connector and stop; if you need a pass-through for a daisy-chain, look at the open-end version of the same series.
Termination and Mounting — What the IDC and Right-Angle Mean for the Harness
The IDC termination accepts both discrete 22 AWG wire and ribbon cable — the insulation is pierced by the slot's tines as the cable is pressed in, making gas-tight connections without stripping or crimping. The free-hanging, right-angle mounting means the cable exits at 90° to the connector face, which is useful when the receptacle is mated to a board-mounted header and the cable needs to run parallel to the PCB.
This is the standard gold thickness for moderate-cycle applications — think field-serviceable harnesses or low-level-signal circuits where corrosion resistance matters, but not the high-mate-rate duty of a 30µin gold contact.