Contact system and board fit
The 66527-510LF is the 20-circuit member of Amphenol ICC's Dubox™ board-to-board receptacle line, a 2-row right-angle through-hole socket with 0.100" (2.54mm) pitch. Mating contacts are gold-plated (30.0µin) for corrosion resistance over repeated mate cycles; solder posts are tin-plated (100.0µin).
Active production, no direct replacement
The 66527-510LF carries an Active product status from Amphenol ICC (FCI).