Molex Micro-Lock 1.25mm pitch vertical pin header, 40 circuits, ROHS3 compliant, active production — a high-density board-mount interconnect for compact wire-to-board applications.
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The Molex 504187-4070 is a 40-circuit vertical pin header from the Micro-Lock 1.25mm series, designed for high-density wire-to-board connections where board space is at a premium. The 1.25mm pitch packs 40 positions into a compact footprint, and the vertical orientation keeps the mated wire assembly perpendicular to the PCB — useful when the z-height above the board is unconstrained but the board-edge real estate is tight.
The mating half is a Micro-Lock 1.25mm receptacle housing (order code series 504193 or equivalent) with matching crimp terminals. The header's vertical pins engage the receptacle's contacts in a straight-through mate; confirm the circuit count matches the 40-position layout.
The Micro-Lock 1.25mm series includes a positive latch on the header that engages the receptacle housing, providing audible and tactile feedback when mated. This latch resists accidental disconnection under vibration or cable strain.
The per-contact current is limited by the narrow pitch and contact beam geometry; derate for higher ambient temperatures per the product drawing.