1.25 mm pitch, 12-position SMT header with shrouded latch
The 5054331291: This is a 12-circuit, dual-row, surface-mount pin header from the Molex Micro-Lock PLUS 505433 series. The 1.25 mm pitch sets the board footprint and the per-contact current ceiling — at this pitch, the current is limited by the wire gauge and contact resistance, not the housing. The full 4-wall shrouding protects the gold-plated male pins during blind mating, and the latch holder provides a positive lock with the mating receptacle housing.
SMT termination with pick-and-place features
Surface-mount termination with solder retention and pick-and-place features means this header is designed for high-volume reflow soldering. This eliminates the need for through-hole soldering and reduces assembly cost. Gold-on-gold interface provides corrosion resistance and stable contact resistance over repeated mating cycles — suitable for field-service applications where the connector is cycled a few times per year.
Mating and termination checklist
This header mates with the Micro-Lock PLUS receptacle housing (sold separately) that accepts the matching crimp terminal. The latch holder on the header engages with the receptacle latch to prevent accidental disconnection under vibration. The header is a board-to-cable/wire style, meaning it connects a PCB to a wire harness via the receptacle. The 2-row, 12-position layout with all positions loaded provides a compact interconnect for signal and low-power circuits.