What This Housing Does in the Harness
For a 4-position housing that means 4 terminals plus the wire seals if the application calls for them. A common mistake is ordering just the housing and wondering why the harness won't populate.
At 4 positions and 2 rows, this is the smallest dual-row receptacle in the 0.100" pitch AMPMODU range. The sibling 1-2333134-5 runs 30 positions at a tighter 0.079" (2.00mm) pitch — a different board footprint entirely. Stick with the 2.54mm pitch for this housing; the header pitch must match exactly.