What the 4-of-7 Loaded Pattern Means for Your BOM
The 1-1971921-7: This header has 7 positions in the housing but only 4 are populated with contacts — the other three are empty cavities. If your harness needs all 7 circuits, this part won't carry the signal on those three pins; you need a fully loaded version or a different order code.
ROHS3 Compliant — no RoHS exemption issues for EU-market builds.
Comparing to the Fully Loaded Sibling (1-2232960-3)
The closest functional alternative is 1-2232960-3 — same 2.50 mm pitch, same shrouded 4-wall design, same locking ramp and UL94 V-0 material. The difference: 1-2232960-3 has 3 positions, all loaded, and ships in a box instead of bulk. If you need all 7 circuits populated, neither this part nor 1-2232960-3 covers it — you'd need a different order code in the 1971921 base series.
Temperature Range and Application Fit
The UL94 V-0 nylon housing won't sustain flame inside an enclosure.