Board-to-Board Fit: 20 Positions, 2.54mm Pitch, Dual-Row
The 65781-010LF: The mating finish is 40.0 µinch (1.02 µm) gold over brass contacts — that thickness supports well over 500 mating cycles in a clean environment, making it a solid choice for test fixtures, programming jigs, or any board that gets swapped in and out during production. In a low-vibration bench or rack application that is fine; for a mobile or high-shock environment, a locking header would be the safer call.
Housing and Compliance: UL94 V-0, RoHS
The black polyester housing is glass-filled and rated UL94 V-0 — the highest flammability class for connector housings in equipment that must not propagate flame inside an enclosure. RoHS compliance is standard for the LF (lead-free) suffix — no restricted substances in the plating or molding.