Edge Connector PCB Board

A PCB with a gold-finger edge connector formed along one or more board edges, used to mate the board directly into a card-edge socket without an intermediate connector. The finger area is electroplated with hard gold over nickel for low contact resistance and thousands of mating cycles, and the board edge is beveled at 30 or 45 degrees so the fingers slide cleanly into the socket without scraping the contact wipers. Trace fan-out from the fingers is controlled to keep impedance and skew on differential pairs. Typical uses are memory modules, M.2 and PCIe add-in cards, server backplane daughter cards, telecom line cards, and any system that needs a removable card without a board-to-board connector taking vertical space.