The 3-647106-2: Termination is surface-mount solder, which means the header reflows alongside other SMD components in a single pass.
Tin-Lead Mating Finish and Current Derating
Tin-lead is a legacy plating — it mates well with tin or tin-lead receptacle contacts and offers good corrosion resistance in non-aggressive environments. The square male pins measure 0.290" (7.37mm) mating length, which provides sufficient wipe for reliable contact with the receptacle's female terminal. All 2 positions are loaded, so there are no empty cavities to manage.
It is ROHS3 compliant. No official successor or replacement has been issued — the base product number 647106 remains in the current catalog.
Peer Comparison: 1-1871673-2
The 3-647106-2 is a simpler, lower-density part — 2 positions vs 4, single row vs dual row, SMD vs through-hole, and a 1-wall shroud vs a fully enclosed locking shroud. The 0.100" vs 0.098" pitch difference means they are not footprint-compatible; each requires its own PCB layout.