The 3-6318490-6 is a 220-position 2-row surface-mount Receptacle Assembly with gold-plated copper alloy contacts and black high temperature thermoplastic housing. The 0.5mm free height is a two-piece connector system designed for parallel board-to-board stacking applications. The 0.5mm FH product has been chosen by the PICMG COM Express working group as the interface between embedded modules and carrier cards.