The 77313-124-24LF: The unshrouded design leaves the pins exposed, so the mating connector must be a 24-position receptacle with 0.100" pitch and dual-row layout; typical mates are BERGSTIK II or other 0.100" square-post receptacles from the same series family.
Current, Plating, and Contact Duty
Rated 3A per contact — this is a signal-level current ceiling, not a power bus. Phosphor bronze contact material gives good spring retention over temperature. The UL94 V-0 thermoplastic housing means this header can be used in equipment that requires flame-rated materials inside an enclosure — a common compliance requirement for industrial control, telecom, and medical peripherals.