Harness Fit: 13 Circuits, 0.156" Pitch, IDC for 20 AWG
The TE Connectivity MTA-156 4-643818-3 is a 13-position single-row receptacle that terminates discrete or ribbon cable via IDC, sized for 20 AWG wire. The 0.156" (3.96mm) pitch matches the standard MTA-156 header footprint — a common spacing for appliance and lighting harnesses where the board layout has room for a wider pitch than 0.100" headers.
Contact Finish: 80.0µin Tin — High Cycle, No Gold Needed
That is a heavy tin plate — well above the 40–50 µin flash typical on commodity IDC connectors — so it handles repeated insertion and extraction in a test fixture or field-service harness without galling the contact surface. Tin is the right choice here: the MTA-156 system is designed for cost-sensitive, moderate-cycle applications where gold's corrosion resistance is not needed. The mating header's tin-plated posts wipe through this thick tin layer on each mate, maintaining a gas-tight junction.
Mating and Mounting: Free-Hanging Receptacle, Locking Ramp
It mates with any standard MTA-156 header (vertical or right-angle, through-hole or surface-mount) that has the same 0.156" pitch and the mating locking ramp feature. The polarizing key on the closed end ensures the connector only goes on one way, which saves a harness assembler from a flipped-wire rework. The IDC termination is a one-step press: the 20 AWG wire is pushed into the slot, and the insulation is displaced by the contact tines — no stripping, no crimping.