What this header is
The Molex 430451212 is the 12-position member of the Micro-Fit 3.0 43045 series — a dual-row 3.00mm pitch board-to-wire header with a 4-wall shroud and locking ramp. Contacts are brass with 100 µin (2.54 µm) tin plating on the mating face and the solder tail. Rated 8 A per circuit at 600 V, it accepts through-hole termination with kinked pins for board retention during wave soldering.
Tin-on-tin — what the plating means for your application
Shrouding and retention
The 4-wall shroud and locking ramp lock the mated receptacle positively — the ramp snaps in and the shroud walls keep lateral stress away from the contacts. Combined with the kinked-pin through-hole termination and the board-guide feature, this header is built for an assembly that sees vibration or mechanical shock after it ships.